MatraSport Forum

Each model => Murena => Topic started by: Bart_Maztra on May 20, 2007, 12:20:27 pm



Title: Let me introduce my maztra
Post by: Bart_Maztra on May 20, 2007, 12:20:27 pm
Hello,
My name is Bart Heemskerk and i live in the Netherlands. Proud owner of a 1981 murena 1.6. I have used this car for years to go to work. And i allways was a bit dissapointed about the power.  So 4 years ago i started an engine conversion. A peugeot 1900 8V. I thought i would do the job in a few weeks, but hel, i was wrong. I haven't been so wrong in my live. 3/4 of a year it was before the first ride was. And after that still 100 things to improve.

During this conversion i needed an other car, because the mur was my daily driver. At a scrapyard i came across a mazda rx-7 from 1983. It had dents allover, 1 headlight was up and 1 headlihgt was down, but it had 1 year apk (mot) .  So that became my temporarely daily driver. And fel in love with it. Not so much on the car, but more on the engine.  And what an engine. An 1.1 liter wankel engine. And what a sound and what a power and what a smooth smoothynes!

So lateron the murena 1900 engine was fitted but i was a bit dissapointed with the result. Yes, it was a lot better then the original 1600, but compared with the mazda......

The mazda is now back on the srapyard, but without the enine. Guess where the engine is now...

(http://i3.photobucket.com/albums/y96/matramurena/murx7.jpg)

(http://i3.photobucket.com/albums/y96/matramurena/maztra.jpg)

(http://i3.photobucket.com/albums/y96/matramurena/momobobo.jpg)

Mazda only mounted this engine longitudinal (is that the right word?). But i want to mount is transversal. Mazda doesn't have a transversakl gearbox to match this engine, so i had to make my own. Unfortunatly i couldn't use a murena gearbox, or the peugeot 1900 gearbox or even a citroen cx box. The flywheel of the rotary engine is simply too big to fit in these gearboxes. A toyota celica was the best option.  Made an adapterplate to fit the gearbox to the engine, made engine mounts which meet the original chassis mounts. (no welding or grinding on my car!)

The car is on the road now! And allthough there are several thing to improve, i am very happy with the result (and the optential).


Title: Re: Let me introduce my maztra
Post by: michaltalbot on May 20, 2007, 01:55:31 pm
Woooow!  :o Wankel engine in Murena! Well, as I don't like conversions on Matra, I like this! I really am fascinated by that what everything is possible to input into the Murena  ;D


Title: Re: Let me introduce my maztra
Post by: gizmo on May 20, 2007, 03:54:57 pm

Yes, Woooow!  and mazda made a turbocharged RX7.



Title: Re: Let me introduce my maztra
Post by: krede on May 20, 2007, 05:35:01 pm
Hello Bart.. and hello Mrs. Maztra :D
And welcome to the site :)
Hats of... That is an INSANELY brave conversion!! :o :o :o ,both in terms of the work involved, AND considering the wankels less then stellar reputation regarding reliability.

Three cheers from here though, for making it work.. AWESOME!  :)

LENNART ! get this one in the gallery !!

Ps: What kind of power do you get from this rotary engine?.. as far as i recall the early type rx-7 didn't put out more then the pug 8v gti?
 


Title: Re: Let me introduce my maztra
Post by: Anders Dinsen on May 20, 2007, 05:47:11 pm
Hi Bart, good to have you on the forum. A big cheer from here on the successful conversion. You have done a magnificent job. It is an impressive engine room indeed. I am also very impressed with the gearbox conversion, it must have been challenging!

Are you still running your Megasquirt injection on the engine or is it Mazdas own engine management (digital or carburetted?). I notice the relay box you had on the Peug engine.

- Anders 8)



Title: Re: Let me introduce my maztra
Post by: krede on May 20, 2007, 06:14:27 pm
http://www.youtube.com/watch?v=5cRlshfhncc

This wouldnt happen to be it would it? :)


Title: Re: Let me introduce my maztra
Post by: Bart_Maztra on May 20, 2007, 07:18:02 pm
This wouldnt happen to be it would it? :)

Yes, that was one of the very first starts.

The peugeot engine was megasquirted, and my intention was to do the same thing with the wankel. Now it is still on its original carb, but i have lots of trouble with this carb. The engine coughs, hesitates and stalls when i floor the pedal. I know its a carb issue, but i can't find the cause.  Convert it to fuel injection is a big project and i don't want to do this now. First i want to solve other more important stuff like renew brakelines, suspension.

Alltough the carb is not right, the car is driveable. 2500 kilometers since 2 months.  Now i am busy to get hold of an other carb. I have ordered a manifold for a single weber 45dcoe. Or dellorto 45DHLA or mikuni 44PHH or solex 44ADHHE. I prefer the dellorto or the mikuni. I probably can get one next week :)


Title: Re: Let me introduce my maztra
Post by: lewisman on May 21, 2007, 12:36:08 am
Woooow!  :o Wankel engine in Murena! Well, as I don't like conversions on Matra, I like this! I really am fascinated by that what everything is possible to input into the Murena  ;D

Michal

I am shocked.

So, you took such great offence at my suggestion of an Alfa V6 but like a Japanese copy of an NSU engine in a murena :o ;)

Personally I think it is always worth a try to find a better engine (after all Matra didn't make any of them) so good on you Bart.  I would always worry about the oil consumption on a Wankel and when they do go wrong you will have to take it all out again.

Good luck!


David


Title: Re: Let me introduce my maztra
Post by: Bart_Maztra on May 21, 2007, 06:51:52 am
......a Japanese copy of an NSU engine in a murena :o ;)
  I would always worry about the oil consumption on a Wankel and when they do go wrong you will have to take it all out again.

Well, the japanese didn't just  copied the nsu engine. It was a licenced build. But the japanese improved the design and sort out all the weak points. The nsu engine was bad and not ready for mass production.  And that's where the wankel gets its bad name from. The japanese version is good and relaible and you get get a lifespan of 200.000 km before it is time for overhaul.
Yes, there is oilconsumption. But not due to bad seals or bad tolerance. Like a two-stroke it needs oil to lubricate the rotor. And mazda is using oil from the sump for that. So you have to top it up once every while.

It is a pity that everyone thinks a rotary is a bad engine. Autojournalist allways likes to refer to nsu engines. It was bad back in the nsu days, but time has moved on.. (it would be the same thing if i say that skoda is crap ;))  Mazda is still producing the rotary engine (RX8) and last year it won the "engine of the year" award.


Title: Re: Let me introduce my maztra
Post by: krede on May 21, 2007, 01:09:13 pm
I've seen quite a few early Mazda wankels in Australian tuning magazins.... and the power they get from them surely proves that the Japanese MUST have made some improvements to the design.
I find Wankels very fascinating... and highly exotic (obviously), but worry that Mazda even today, haven't solved the issue of its high fuel consumption.     


Title: Re: Let me introduce my maztra
Post by: michaltalbot on May 21, 2007, 09:57:57 pm

I am shocked.

So, you took such great offence at my suggestion of an Alfa V6 but like a Japanese copy of an NSU engine in a murena :o ;)

David

 :D :D :D well, I am sorry, Alfa or Peugeot conversion is just changing another "normal" engine to something not original, but wankel engine in Murena is something totally mad and absolutelly exotic! Of course that I will NEVER do this to my Matra (I'll rather be the last one on the circuit, but when I show my engine to somebody, I'm showing what Matra really built in early 80ties, and everybody understand to that, not something like - we say - catdog), but it is imposant to see it. It is like V8 engine in motorbike :)

 I really hate Skoda cars. Last good Skoda was... they never built good car :) but old Octavia from 60ties was not bad. Than they stoped themselves on rear-engined cars till the end of 80ties and than Favorit and Felicia was something terrible. New Octavia and Fabia is from 99,9% Volkswagen, so we aren't speaking about Skoda cars. I understand, that when there were comunists, Skoda engineers was not allowed to produce better car than Russians. There were lot of beautifull projects, but it was forbiden to produce them. But the result is... that Skoda made bad cars. Now the technology is German, design is made by German hands, and in the factory there are working Ukrainian and Slovak people, so what is there Czech? Beer in their stomaches... And what I absolutely don't like are people who are making tuning on Skoda. But man, be sure that it is tuning from Your worse dreams! I will search some pics...


Title: Re: Let me introduce my maztra
Post by: michaltalbot on May 21, 2007, 10:26:02 pm
(http://www.herngroup.cz/image.php?idx=22740&di=6)
(http://bazar.tuning-magazine.cz/images/1644_2007051556_tmb1.jpg)


Title: Re: Let me introduce my maztra
Post by: krede on May 21, 2007, 11:32:54 pm
Way back a former friend of mine had one of those in red.. with a flat six from a Porsche fitted to it....  scary!!   


Title: Re: Let me introduce my maztra
Post by: michaltalbot on May 22, 2007, 12:01:58 am
Skoda with Porsche engine? Selfkiller...
When Skoda made crashtests in 70ties, front part was totally broken and front bonnet was stoped by wiper arms... but they said: right, good! And the car was produced. Lot of people was killed by bonnet cut their heads... Skoda - simply never!


Title: Re: Let me introduce my maztra
Post by: Bart_Maztra on May 22, 2007, 06:59:00 am
More pics on the dutch forum
http://oscar.messageboard.nl/7101/viewtopic.php?t=373&postdays=0&postorder=asc&&start=0 (http://oscar.messageboard.nl/7101/viewtopic.php?t=373&postdays=0&postorder=asc&&start=0)


Title: Re: Let me introduce my maztra
Post by: gizmo on May 22, 2007, 11:53:21 am

Great project......I only wish I could read dutch.



Title: Re: Let me introduce my maztra
Post by: lewisman on May 22, 2007, 08:12:02 pm
Impressive bit of re-engineering!

Like Gizmo, it is a shame I can't read Dutch, but you get a good idea of what was being done from the pictures.

Well done. ;D


Title: Re: Let me introduce my maztra
Post by: Bart_Maztra on May 22, 2007, 08:58:36 pm
Just claimed www.maztra.nl
Gonna make the story in englisch.


Title: Re: Let me introduce my maztra
Post by: krede on May 22, 2007, 09:53:23 pm
If you do, I'm sure Lennart will be happy to put a like to it on this site :)


Title: Re: Let me introduce my maztra
Post by: Lennart Sorth on May 30, 2007, 10:39:11 am
If you do, I'm sure Lennart will be happy to put a like to it on this site :)
Indeed.  - especially since the Murena conversion page hasn't seen much news for quite a while.

/Lennart


Title: Re: Let me introduce my maztra
Post by: krede on June 03, 2007, 09:33:22 pm
Why?... whats the point in posting this? ???


Title: Re: Let me introduce my maztra
Post by: Anders Dinsen on June 03, 2007, 09:34:03 pm
Why?... whats the point in posting this? ???

It was spam, I've removed it. User is disappearing as soon as Lennart has him removed too.


Title: Re: Let me introduce my maztra
Post by: krede on June 03, 2007, 09:37:30 pm
Riight.. I'll have spam spam spam spam spam spam spam baked baked beans bacon and spam....then.. and a piece of rat pie, with not too much rat in it.. :)


Title: Re: Let me introduce my maztra
Post by: Lennart Sorth on June 04, 2007, 12:12:55 am
User is disappearing as soon as Lennart has him removed too.
he is history.
With the image-recognition joining system, it means there are sad people actually spending their time subscribing to forums, just to piss of the members like that.  May his socks shrink, next time he washes them.

or as the Chinese curse goes: may he live in "interesting" times. :->

/Lennart


Title: Re: Let me introduce my maztra
Post by: Anders Dinsen on June 04, 2007, 08:55:20 am
User is disappearing as soon as Lennart has him removed too.
he is history.
With the image-recognition joining system, it means there are sad people actually spending their time subscribing to forums, just to piss of the members like that.  May his socks shrink, next time he washes them.

or as the Chinese curse goes: may he live in "interesting" times. :->

/Lennart


I like the socks curse!

This particular guy was posting links to web sites. I didn't visit, so I can only guess what could be found there, but I think I know what it was... :o I hope you didn't vist, Krede - you might have gotten a bit more "spam" than you wanted.


Title: Re: Let me introduce my maztra
Post by: krede on June 04, 2007, 01:10:01 pm
"curiosity killed the cat".... and well.. in this case... spammed Krede :)


Title: Re: Let me introduce my maztra
Post by: Anders Dinsen on June 04, 2007, 01:50:15 pm
"curiosity killed the cat".... and well.. in this case... spammed Krede :)

I hope you didn't receive any spyware installed?


Title: Re: Let me introduce my maztra
Post by: Bart_Maztra on August 09, 2007, 10:06:17 pm
Today the car went to the APK (dutch MOT). The inspector was suprised on what he found under the bonnet. He had to make a few phonecalls to the RDW (dutch motoring goverment) to check if it was legal and howmuch CO it may produce. The wankelengine is not legal, but it is not an issue of the m.o.t. The CO limit is 4,5% and the car produced 4,2%. The only faillures were the ailligment of the headlights, but that was easily fixed. So maztra is mot-ed and i am  :)


Title: Re: Let me introduce my maztra
Post by: Anders Dinsen on August 09, 2007, 10:57:43 pm
Today the car went to the APK (dutch MOT). The inspector was suprised on what he found under the bonnet. He had to make a few phonecalls to the RDW (dutch motoring goverment) to check if it was legal and howmuch CO it may produce. The wankelengine is not legal, but it is not an issue of the m.o.t. The CO limit is 4,5% and the car produced 4,2%. The only faillures were the ailligment of the headlights, but that was easily fixed. So maztra is mot-ed and i am  :)

Big cheers from me! Congratulations :)

- Anders


Title: Re: Let me introduce my maztra
Post by: Lennart Sorth on August 10, 2007, 02:25:52 am
So maztra is mot-ed and i am  :)
Congratulations!

But why is the Wankel engine not legal ? - If the Alfa V6 can be made legal in NL, why not the Wankel ?

/Lennart


Title: Re: Let me introduce my maztra
Post by: Bart_Maztra on August 10, 2007, 07:06:12 am
The car documents of the murena says "4 cilinders" and that is now not correct. I should bring my car to the motoring goverment to get the documents changed. But i am scared that they find something they don't like, like pollution, soundlevel, handling or construction. If that happens, they will keep the documents....

The same thing with a V6, it is no "4 cilinders"


Title: Re: Let me introduce my maztra
Post by: Anders Dinsen on August 10, 2007, 08:34:36 am
The car documents of the murena says "4 cilinders" and that is now not correct. I should bring my car to the motoring goverment to get the documents changed. But i am scared that they find something they don't like, like pollution, soundlevel, handling or construction. If that happens, they will keep the documents....

The same thing with a V6, it is no "4 cilinders"

There are four cylinders in total on your brake calipers, so I don't see the problem ???


Title: Re: Let me introduce my maztra
Post by: roy4matra on August 14, 2007, 04:38:44 pm
The peugeot engine was megasquirted, and my intention was to do the same thing with the wankel. Now it is still on its original carb, but i have lots of trouble with this carb. The engine coughs, hesitates and stalls when i floor the pedal...

Hi Bart,

First I have to congratulate you on the conversion and getting it 'Mot'd.  I remember hearing about your attempt to put the rotary in the Murena, around the time you started, and wondered if it would ever be done as there was so much work involved.  But you have succeeded, well done.

Regarding the carb. trouble, have you considered this.  If you are using the carb. that was designed to work on the rotary engine in the Mazda, and it is directionally sensitive as most are, it will never work properly in the Matra unless you turn it through 90 degrees.  Carbs. are generally designed for one direction of travel, and since the engine has changed to being transverse, assuming the carb. is still as it was in the Mazda, it will have turned too and now be facing the wrong way.

There were owners here a while ago fitting Weber 38 DGMS or DGAS to Murena 2.2 hoping to get better power, but these were designed for a longitudinal engine (Ford Essex V6 engine) and could never work mounted transversely, as those owners found out!  The major problem is the fuel in the float chamber surges when driving and the ducts for the fuel are in the wrong place.

So your carb. problems may be have other sources too, like dirt or blocked jets, but the directional problem will remain even if these are cured.  If you cannot turn it easily, fuel injection may be your best alternative.

Roy


Title: Re: Let me introduce my maztra
Post by: krede on August 14, 2007, 05:19:40 pm
Im curious.. how difficult to get hold of, and how expensive are spare parts for the rotary engines?


Title: Re: Let me introduce my maztra
Post by: Bart_Maztra on August 15, 2007, 07:26:54 am
Directionally sensitive carburettor? I have never heard of it. But your explaination makes sense. Turning the carb 90' is very difficult. I have bought a mikuni carb (equal to solex phh) which is positioned with the airhorn facing forward. When i had this carb installed, i realised that the carb is not mounted level. Thats because the wankel engine is mounted longtudinal in the mazda and is a bit tipped back. The inlet manifold is making a angle to compensate it. Now the engine is mounted level and so the carb is at an angle. The mazda carb have two float chambers and i have set one slightly lower and the other slightly higher to get the right fuellevel at the emulsion tubes.

The minuni carb have 1 float chamber, so the level will never be right. I realised too late that the fuellevel is very critical, so the mikuni will never work right.  (reading a carb manual is very interesting)


Title: Re: Let me introduce my maztra
Post by: roy4matra on August 15, 2007, 09:22:41 am
Directionally sensitive carburettor? I have never heard of it...

Not many owners realise this, and even I'm afraid to say not all mechanics either.

Quote
Turning the carb 90' is very difficult...

I can understand that, and the angle on the manifold to suit its normal Mazda application would present a major problem too.

Quote
... Now the engine is mounted level and so the carb is at an angle. The mazda carb have two float chambers and i have set one slightly lower and the other slightly higher to get the right fuellevel at the emulsion tubes.

That is clever, but would still cause problems I'm afraid since the two emulsion tubes will have different amounts of fuel in them, which will affect the air/fuel mixing.  The holes in the emulsion tube walls are set at specific heights to do their job properly.  If one now has a different fuel level to get the same overall height from ground as the other, they will not be able to work the same or correctly.

Regarding the direction of mounting I'll explain a little more so all can understand.  Under acceleration the fuel in the float chamber will surge to the rear, and when cornering it will go left or right.  Under braking it will come forwards.  The float chamber ducts that feed the various jets are positioned at the rear such that the fuel is always plentiful under straight acceleration and reasonable when cornering when you don't need quite as much, but will 'starve' when slowing or braking, which is fine as that is the time you don't need it.  It's not just the ducts, but the levels in the emulsion tubes too of course.

Now if you turn the carb. through 90 degrees as in this case where you turned the engine from longitudinal to transverse, the ducts are now on one side.  They will get plenty of fuel under cornering one way, but be starved on cornering the opposite way!  Under straight acceleration it will be slightly reduced and be similar under braking.  So you will find that cornering one way will cause hesitation or cutting out, and full acceleration forwards will be compromised unless you compensate with higher fuel levels but that will cause idle and emission problems.  I have seen it many times and there is no cure, except to change the carb. or turn it.

Quote
The minuni carb have 1 float chamber, so the level will never be right. I realised too late that the fuel level is very critical, so the mikuni will never work right.  (reading a carb manual is very interesting)

The type of carb. that might work is the vertically mounted type such as the Weber IDA or IDF which I think may not be directionally sensitive, but it would be best to confirm this with a Weber agent as I have no actual experience with them.  It might be simpler to fit something like the 28/36 DCD type mounted the correct way.  There used to be 90 degree manifold adaptors for these, for when they were used on Minis.  Or how about the 36 DCNF from a Bagheera?  The problem will be making or modifying a manifold to mount them.

Roy


Title: Re: Let me introduce my maztra
Post by: krede on August 15, 2007, 09:40:05 am
Why not convert it to fuel injection while you are at it?.... if you have the know how to fit a wankel in a murena, injection would be a piece of cake :D


Title: Re: Let me introduce my maztra
Post by: Anders Dinsen on August 15, 2007, 11:35:59 am
Why not convert it to fuel injection while you are at it?.... if you have the know how to fit a wankel in a murena, injection would be a piece of cake :D

You were born optimistic, weren't you? ;)

Bart did run his old engine, a 1.9 Peugeot, on MegaSquirt, so he has been there already.

Quote from: roy4matra
Regarding the direction of mounting I'll explain a little more so all can understand.  Under acceleration the fuel in the float chamber will surge to the rear, and when cornering it will go left or right.  Under braking it will come forwards.  The float chamber ducts that feed the various jets are positioned at the rear such that the fuel is always plentiful under straight acceleration and reasonable when cornering when you don't need quite as much, but will 'starve' when slowing or braking, which is fine as that is the time you don't need it.  It's not just the ducts, but the levels in the emulsion tubes too of course.

I've got this picture of the Solex 34CIC which illustrates it:

(http://dinsen.net/murena/carburettor/cut.jpg)

The emulsion tubes are denoted "Gg", and they make a very rich mixture of fuel and air to feed the jets "K". The higher the level of fuel in the float chamber is, the richer will the mixture be in the jets.

- Anders


Title: Re: Let me introduce my maztra
Post by: krede on August 15, 2007, 11:42:42 am
Quote
Bart did run his old engine, a 1.9 Peugeot, on MegaSquirt, so he has been there already.

My point exactly!! :) ... why bother with carbs? (ducks!!) ;)


Title: Re: Let me introduce my maztra
Post by: Anders Dinsen on August 15, 2007, 11:46:06 am
Quote
Bart did run his old engine, a 1.9 Peugeot, on MegaSquirt, so he has been there already.

My point exactly!! :) ... why bother with carbs? (ducks!!) ;)

How's your conversion going?


Title: Re: Let me introduce my maztra
Post by: krede on August 15, 2007, 11:53:15 am
I'm expecting the fuel pump today, and the map air temp and oxygen sensor by next weekend.
I'll try to have it build/run in the 27'th... or sometime that week.


Title: Re: Let me introduce my maztra
Post by: roy4matra on August 15, 2007, 01:38:33 pm
Why not convert it to fuel injection while you are at it?.... if you have the know how to fit a wankel in a murena, injection would be a piece of cake :D

Well I did say earlier that it may be easier to go fuel inj. and whilst I note the smiley, essentially Krede may be right!

I've got this picture of the Solex 34CIC which illustrates it:

(http://dinsen.net/murena/carburettor/cut.jpg)

The emulsion tubes are denoted "Gg", and they make a very rich mixture of fuel and air to feed the jets "K". The higher the level of fuel in the float chamber is, the richer will the mixture be in the jets.

- Anders

Actually to be totally accurate Anders, the items noted as Gg are the main jets, which on this carb. are mounted in to the carb. casing.  The emulsion tubes are the dotted sections higher up with the air correction jets at the top.  On Webers the main jets are pushed in to the bottom of the emulsion tubes which are pushed in to the air corr. jets at the top; unlike the Solex ones where the air corr. jets cannot be changed separately.  Also it is not strictly true that the higher the fuel level, the richer the mixture.  It is more complex than that, since you can have small, medium, large or no holes in upper, centre, and lower positions, and it it the combination of the right numbers and sizes of these holes at the correct positions that will determine the mixture and progression at all engine loads or demands.  This is why it is such an art/science choosing the correct emulsion tubes.  And the tube numbers are not logical either just to make it harder!  For instance on a Weber going from lean to rich the common tubes are F11, F15, F16, F2, F8, and F7...  On Dell'Ortos it would be 7772.10, 7772.8, 7772.2, 7772.1, 7772.14, 7772.5, 7772.7, and 7772.6!

On heavy acceleration or wide open throttle the emulsion tubes will actually be empty, with fuel pouring in the bottom through the mains, and air coming in through the air corr. jets and mixing rapidly and going out via the auxilliary venturis 'K', to the engine.  When you back off or close the throttle, the wells will fill again to their pre-determined level.  This is set by the float levels which is why they are also important.

You can see from this why the carbs. on an angled manifold with different float levels to get the two side the same, as Bart said he tried, will not work.  The lower side will have more uncovered holes than the higher side; thus altering the mixtures from side to side and the carbs. capacity to feed the engine equally.  Good diagram though - where did that one come from?

Roy


Title: Re: Let me introduce my maztra
Post by: Anders Dinsen on August 15, 2007, 02:14:20 pm
Good diagram though - where did that one come from?

Thanks a lot for that clarification, Roy :) I have always thought that the main jets were the things sticking into the venturi! ;)

But, I think I understand how the emulsion tubes work now, and how important they are. Your explanation also explains how the main jets and air corrector jets are interlinked to give the right mixture over the full air-speed spectrum.

The diagram has been very helpful to me, and I found it on a service documentation page on the 34CIC which a kind person has scanned and put on: http://www.espace-murena.com/Fichiers/Carbu/Solex1.pdf (http://www.espace-murena.com/Fichiers/Carbu/Solex1.pdf)
I simply cut it from there and put it on my own web page, from which the image below is directly linked.

- Anders


Title: Re: Let me introduce my maztra
Post by: Bart_Maztra on August 15, 2007, 08:05:26 pm
Here is the original carb, which is a 4 barrel downdraft. The mixture of each rotor is supplied a primairy and a secondary barrel. And each set of barrels has it's own floatchamber.

(http://i3.photobucket.com/albums/y96/matramurena/4barrel.jpg)

For this carb there are no other jets to source.

And the 44phh mikuni carb which should replace the original carb

(http://i3.photobucket.com/albums/y96/matramurena/sidedr.jpg)

I bought a new manifold for a weber dcoe which has the same dimensions as this mikuni. And i found a mikuni carb in belgium. Then i got the carb manual and then i learned that a carb which is not level will not work. :(


Title: Re: Let me introduce my maztra
Post by: Bart_Maztra on August 15, 2007, 08:31:43 pm
EFI! Already in progress :)

This is the plan:
I want to mount two injectors in the mikuni manifold.

(http://i3.photobucket.com/albums/y96/matramurena/injvoo.jpg)

(http://i3.photobucket.com/albums/y96/matramurena/injzij.jpg)

This is the easyest way to mount the injectors. It would be better to do 4 and put them in the lower part of the manifold, but there is no room around the manifold for that.
From ebay i bought a few aluminium injector mounts which will be welded in top of the manifold.

(http://i3.photobucket.com/albums/y96/matramurena/boss.jpg)

That's the story so far. Next week i go to see my "welderman" to do a trailweld on the manifold. As it is cast-aluminium it is a guess if it is wed-able or not. Nice to know before i start cutting holes in the manifold ;)
A throttlebody is also needed. To start with i gonna use the mikuni carb as thottlebody. The venturies will be removed and so i have a simple bold-on thottlebody with a airfilter.

I also need to source two injectors. They need to be around 700cc . And that is BIG. And i need a fuelpump aswell. The fuelpump i had on the peugeot engine is too small.  Need some more searching on ebay.

Here are some pics of the megasquirt EFI which was running the peugeot engine.

(http://i3.photobucket.com/albums/y96/matramurena/ms2.jpg)

The white box contains some relais and fuses and it is a junctionbox who connects the controller to all the sensors, fuelpump, injectors.  The controller is located on the passenger shelf. Under the radio are some buttons and a display to keep you entertained.

(http://i3.photobucket.com/albums/y96/matramurena/ms3.jpg)

The controller is a "build it yourself" kit which can be programmed by computer.

(http://i3.photobucket.com/albums/y96/matramurena/ms4.jpg)

(http://i3.photobucket.com/albums/y96/matramurena/ms1.jpg)




Title: Re: Let me introduce my maztra
Post by: krede on August 15, 2007, 08:46:33 pm
That's SUCH a cool project mate!!!...  8)


Title: Re: Let me introduce my maztra
Post by: Bart_Maztra on August 16, 2007, 06:55:06 am
I'm expecting the fuel pump today, and the map air temp and oxygen sensor by next weekend.
I'll try to have it build/run in the 27'th... or sometime that week.

Héé Krede, What are you doing?


Title: Re: Let me introduce my maztra
Post by: krede on August 16, 2007, 03:41:59 pm
Nothing as exciting as you :).. Just swapping my dellortos for throttle bodies and injection.


Title: Re: Let me introduce my maztra
Post by: Anders Dinsen on August 16, 2007, 04:10:55 pm
Nothing as exciting as you :).. Just swapping my dellortos for throttle bodies and injection.

Just? ???


Title: Re: Let me introduce my maztra
Post by: krede on August 16, 2007, 04:32:06 pm
Well... To be honest it hasn't proved as simple... and much more expensive then I expected ! :)


Title: Re: Let me introduce my maztra
Post by: Bart_Maztra on August 18, 2007, 09:10:10 pm
Very small video:
(http://i3.photobucket.com/albums/y96/matramurena/th_Film_0001.jpg) (http://s3.photobucket.com/albums/y96/matramurena/?action=view&current=Film_0001.flv)


Title: Re: Let me introduce my maztra
Post by: Lennart Sorth on August 19, 2007, 03:20:05 pm
Very small video:
That's very cool, as the revcounter is known to read 10-20% too low.
Take care not to bend that needle ! :-)

/Lennart


Title: Re: Let me introduce my maztra
Post by: krede on August 19, 2007, 08:28:31 pm
Quote
as the revcounter is known to read 10-20% too low
It is?..
I had mine checked, adn it was pretty much spot on.. ???


Title: Re: Let me introduce my maztra
Post by: davidewanprice on August 22, 2007, 06:57:15 pm
What makes me mad is your battery status  gauge is mid way! Mine sits on the low end most of the time!


Title: Re: Let me introduce my maztra
Post by: krede on August 22, 2007, 08:01:17 pm
What makes me mad is your battery status  gauge is mid way! Mine sits on the low end most of the time!
Mine too


Title: Re: Let me introduce my maztra
Post by: michaltalbot on August 22, 2007, 08:46:54 pm
My old silver 2,2 had the same problem...  ;)


Title: Re: Let me introduce my maztra
Post by: Anders Dinsen on August 22, 2007, 10:34:27 pm
Well that's quite easy to fix if you remove the voltmeter from the instrument assembly and adjust the bi-metal strip in the voltmeter as I have described last year in this thread:
http://www.matrasport.dk/forum/index.php?topic=269.0 (http://www.matrasport.dk/forum/index.php?topic=269.0)


Title: Re: Let me introduce my maztra
Post by: michaltalbot on August 22, 2007, 11:24:26 pm
I solved the problem easily - I simply moved the arm of the voltmeter by hand using a little force without demounting the voltmeter :D


Title: Re: Let me introduce my maztra
Post by: roy4matra on August 24, 2007, 01:12:11 am
What makes me mad is your battery status gauge is mid way! Mine sits on the low end most of the time!

That's because there is usually a loss of voltage between the battery and the gauge, owing to numerous poor connections.  If you check at the gauge with a good voltmeter, it can be as much as 2 volts lower than true!  I cleaned all my connections and earths and my gauge sits slightly right of the middle when charging (without bending any gauge needles).  This is the correct way to correct the fault.

Roy


Title: Re: Let me introduce my maztra
Post by: Anders Dinsen on August 24, 2007, 10:37:04 am
What makes me mad is your battery status gauge is mid way! Mine sits on the low end most of the time!

That's because there is usually a loss of voltage between the battery and the gauge, owing to numerous poor connections.  If you check at the gauge with a good voltmeter, it can be as much as 2 volts lower than true!  I cleaned all my connections and earths and my gauge sits slightly right of the middle when charging (without bending any gauge needles).  This is the correct way to correct the fault.

Roy

I did just that on my car, and measured the voltage, but the misreading was still greater than it should have been. That's why I corrected it. It's possible however, that some of the windings on the meter have been lost, if you check my photo of the instrument in the other thread, there's some coiled wire sitting loose. That would have resulted in less heat generated, i.e. less bend on the bi-metal strip.

But your point is correct, Roy. Don't just fix the reading, fix the problem :)


Title: Re: Let me introduce my maztra
Post by: Bart_Maztra on October 21, 2007, 10:22:26 pm
I've made a start to put some things on my website.
Sorry, it's in dutch, but i will make a translation.
www.maztra.nl (http://www.maztra.nl)


Title: Re: Let me introduce my maztra
Post by: krede on October 22, 2007, 03:30:43 pm
My god!!! that's nice work mate!! truly awesome. !!!



Title: Re: Let me introduce my maztra
Post by: michaltalbot on October 24, 2007, 11:44:24 am
WOW! Very interesting project  :o
But, I wouldn't be the man who will return this Maztra into the original Matra condition...


Title: Re: Let me introduce my maztra
Post by: Bart_Maztra on January 05, 2008, 10:14:21 pm
Website is now in (very bad) englisch.
www.maztra.nl (http://www.maztra.nl)


Title: Re: Let me introduce my maztra
Post by: krede on January 05, 2008, 10:20:58 pm
Excellent work mate!
I think the Wankel engine is such a good /and brave) choice for a murena.!!awesome
How much does it weigh compared to the original one? is there anything saved?... and how much power do you plan on extracting from it?


Title: Re: Let me introduce my maztra
Post by: Bart_Maztra on January 06, 2008, 12:32:51 pm
I don't know the weight of a 1.6 engine.  I've put the peugeot 1900 engine +gearbox on a scale: 165kg
And the rotary + gearbox but without carburettor: 170kg. Add some weight of a carb.

In the mazda the engine produced 133 hp. But now lots of horses are missing. I blame the carb and the exhaust. Now i am (very slowly) preparing fuel injection. Collecting materials (injectors, throttle body, fuelpump, regulator, sensors) and information. I also want to make a complete new exhaust system. Make a new manifold from thick wall 2' pipe and two borla silencers.
But first i have to renew all brake pipes.

Rotary power when the engine was in the mazda. Just before the start of the 1900 conversion.

(http://i3.photobucket.com/albums/y96/matramurena/vermogenRX7.jpg)


And the matra 1.6 with two webers:

(http://i3.photobucket.com/albums/y96/matramurena/vermogenmatra.jpg)


Title: Re: Let me introduce my maztra
Post by: krede on January 06, 2008, 06:26:08 pm
You are not planning on tuning it any further then?..

I had my 2.2 with "S" cam and 45mm throttlebodies rolled when it was installed 2 weeks ago and it did this:

(http://img.photobucket.com/albums/v200/krede/IMG.jpg)

But it is still by no means what I would call a "fast" car..
I must admit that I had hoped it would do more... 149hp 180nm isn't particularly impressive for an engine of that displacement and with those modifications done to it.
But at least it runs and idles much much better then with the carbs...
Fuel injection Rocks! :)


Title: Re: Let me introduce my maztra
Post by: Anders Dinsen on January 06, 2008, 10:17:26 pm
I've read engine tuners say that 60-70 bhp per litre is attainable without much fuss, but everything above that is a pain and requires extensive cam tuning, porting, compression increase, balancing / blue printing etc. EFI can't produce more power than a well tuned carb, but it can do it better, and it's fine flat torque curve you have there, Krede! :)

Bart, it's a funny peak in torque your engine had near max rpm, otherwise it's extremely flat! Just like I remember I ride I once had in an RX7 :)

- Anders


Title: Re: Let me introduce my maztra
Post by: Bart_Maztra on January 07, 2008, 06:44:16 am
You are not planning on tuning it any further then?..
But at least it runs and idles much much better then with the carbs...
Fuel injection Rocks! :)

That's what i want.  Find the lost horses back and make it run sweetly.
If i want more power i need to do porting.


Title: Re: Let me introduce my maztra
Post by: Bart_Maztra on January 20, 2008, 01:57:46 pm
Website update! 1900 motor conversion

http://www.maztra.nl (http://www.maztra.nl)

(http://www.maztra.nl/bestanden/Cacht.JPG)

(http://www.maztra.nl/bestanden/D110.JPG)


Title: Re: Let me introduce my maztra
Post by: Anders Dinsen on January 20, 2008, 02:23:03 pm
Have you put it back?  ;D


Title: Re: Let me introduce my maztra
Post by: krede on January 23, 2008, 07:42:38 pm
Looks like a neat job..
Why didnt you keep it, and get a "fresh" murena for your rotary conversion?


Title: Re: Let me introduce my maztra
Post by: Bart_Maztra on May 26, 2008, 09:22:30 pm
The matra murotary have done 8000 kilometers so far and still going and going.  Still there is a lack of  performance. I blame the carburetter.  Hope to solve it with injection.

Now i am preparing an injection system. On the previous 1.9 engine i had also fitted my own injection system. It is a megasquirt EFI. Now the wiring is still present in my car. It is only the hardware i have to worry about.
I bougth a manifold for a weber dcoe carb which i will sacrify for efi.  Drilled two holes in the runners and welded two injector bosses on it.

(http://i3.photobucket.com/albums/y96/matramurena/efi4.jpg)

From some aluminium sheets i made an "intake box". On top of this box i put a throttlebody of a vauxall. On the side of the box i make fittings for vacuum for brakes, pop-up lichts, ignition advance, fuelpressurething. On the back i put the fast idle solenoid from the old 1.9 engine.

(http://i3.photobucket.com/albums/y96/matramurena/eefii1.jpg)

Just made a fuelrail from copper pipe and brass fittings.

(http://i3.photobucket.com/albums/y96/matramurena/kiwaa.jpg)

Progress is slowly, but i am satisfied the way it goes. 


Title: Re: Let me introduce my maztra
Post by: krede on November 16, 2008, 10:48:24 am
Quote
Warning: this topic has not been posted in for at least 120 days
Any news Bart ?  :)


Title: Re: Let me introduce my maztra
Post by: Bart_Maztra on November 16, 2008, 01:16:28 pm
Quote
Warning: this topic has not been posted in for at least 120 days
Any news Bart ?  :)

Injection update!

(http://i3.photobucket.com/albums/y96/matramurena/eefii.jpg)
The fuel pressure regulator is mounted. And i got an opel performance air horn.


(http://i3.photobucket.com/albums/y96/matramurena/eefii2.jpg)
On the back i put the (peugeot) fast-idle solenoid and the coolant thing which goes with the solenoid. That thing contains also the water temperature sensor. The air temperature sensor will be placed in the air horn.  The 2 blue fitting are for the brake booster and pop-up headlights.


(http://i3.photobucket.com/albums/y96/matramurena/kiwaa.jpg)
Here's the fuel rail, made from 12mm copper waterline. The 12mm sockets is the right size to make 1/4" thread in it, so i can easily make fittings for the bosses and hoses.


(http://i3.photobucket.com/albums/y96/matramurena/eefie1.jpg)
Amazingly it fits! (well, just little clearance from the alternator)
Note the throttle lever, which costs me some headache. And note the fuel pump, fixed with cable-ties, where the coolant tank used to be.


(http://i3.photobucket.com/albums/y96/matramurena/eefie2.jpg)
A volvo throttle position sensor is bodged in position.
Note the neat wiring 8) (Hey, thats my profession 8))


Now it's time to get it started and tuned.
It starts the first time! That's very promissing..... not.
It idles very rough. I have to inject lots of fuel to  keep it from stalling. Hmmm. :-\
But when i blib the throttle, it sound very promissing! I even made a short testdrive and i was impressed. I spent a few days trying to get the idle right, but without succes.
Tuning an ecu from scratch is done step by step.  Don't start the next step before the current step is ready. Step number one: Get the engine started. Step 2: get the idle right.  So no use to continue if i don't get the idle right.

Spending some evenings on several forums learned me, that the way i put the injectors won't work.  The injectors are spraying a big part of the fuel against the inner walls of the manifold.  The injectors are BIG (680cc/min) so lots of it are dripping on the walls.
And at idle there is very little air movement in the manifold, so the fuel is sprayed in almost stationairy air. And the air movement is also going in two directions. It goes down at the intake-stroke, but when the other "cilinder" is doing the intake, it is causing the air movement to go up a little.

The best place to put the injectors is as close to the intake as possible. So it sprays directly in the intake ports.
But on the other hand, i know some cars which have the same manifold as i have, but with a DCOE throttlebody. With such a set-up you have the injectors even further away than i have.
I don't understand why a dcoe throttlebody will work, and what i made won't.

So it's back to carb. :(
Which is a shame, spending so much time and money to it.
What's next? Skip injection? Improve carb? Improve exhaust?



Title: Re: Let me introduce my maztra
Post by: Anders Dinsen on November 16, 2008, 03:05:20 pm
Your construction looks extremely good. It would be a pity to go back to the carb (I'm sure you agree ;) ).

I don't understand why a dcoe throttlebody will work, and what i made won't.

I think the spray pattern of your injectors could be the source of the problem. A carburettor emulsifies fuel in the air, and if the manifold is reasonably smooth on the inside, the fuel will not condensate on the manifold walls unless the manifold is very cold. Especially with this design, where the manifold has a long horisontal section: All the fuel that condensates will sooner or later end in the engine anyway. An injector does not emulsify the fuel in the air in the same way as the carburettor, but makes a fine spray of fuel. On production piston engines, the fuel is sprayed on the back of the closed valve to cool it down, and the fuel "mist" is later sucked into the engine when the valve opens. Spraying on the hot valve also prevents condensation. It's like a pair of glasses - moisture condensates on cold glasses, not on hot!

It looks like you have some relatively long stems on the injector bosses. If the spray pattern of the injector is optimised against a large diameter inlet engine, it could be quite wide and most of the fuel may end up being sprayed directly on the walls of the bosses. You could go to a scrap yard and try to find some injectors from a smal engine with multipoint injection - e.g. a Fiat Punto 75 (I used to have one ;) ) and fit them instead. I know they will be too small for full power operation, but if you can make it idle well, then it may work for you. Alternatively you could try shortening the stems on the bosses so the full spray goes into the manifold.

Have you tried firering the injectors on a piece of paper to see the pattern? I've read one source recommending that to check the injector and to verify that several (used injectors) are compatible.

- Anders


Title: Re: Let me introduce my maztra
Post by: Bart_Maztra on November 16, 2008, 03:56:35 pm
The injectionsystem is now sitting in a corner for a few months. Haven't give it any attention since then.

Don't think condensating is the problem. Because:
1 the manifold directly above the exhaust manifold, so it will warm up.
2 Simular set-ups with a proper dcoe throttly body + injectors are working. With the injectors further away than i have.

Lenght of the stem: The injector boss is designed for this purpose, so i assume the stem is allright!
(http://www.sdsefi.com/newboss12.jpg)
But thinking of it:  There is a 13mm hole in the manifold where the boss is sitting against. So maybe the fuel is spraying against the inside of this hole? Maybe i have to enlarge the hole?  Have to check.

Another thought:
As i have 1 throttle body, the two manifold runners are connected together. When 1 cilinder is doing the intake, it is effecting the air in the other runner.  With a proper dcoe throttle body the two runners become individual.  That's worth an experiment.  i still have a dcoe style carburettor somewhere. If i take out the venturies, i can use it as athrottle body! See if that makes a difference!

And it's a good idea to check the spraying pattern and the cc/min.


Title: Re: Let me introduce my maztra
Post by: Anders Dinsen on November 16, 2008, 07:10:15 pm
The injectionsystem is now sitting in a corner for a few months. Haven't give it any attention since then.

That's quite understandible...

Quote
Don't think condensating is the problem. Because:
1 the manifold directly above the exhaust manifold, so it will warm up.
2 Simular set-ups with a proper dcoe throttly body + injectors are working. With the injectors further away than i have.

There could be a few differences which I think could be interesting to look into... For example, on a throttle body, the injector is angled downwards. With this manifold, the injector will probably be looking into a wide and relatively deep well through the corner of the inlet runner. On your setup, the injector is probably looking down into a relatively narrow tube. The amount of fuel which it is spraying on the walls won't be abe to find its way into the engine when it's idling and air flow is small.

Regarding the manifold heating, don't forget that while the exhaust is heating it, the inlet air will be cooling it, so it will level up to a certain point. Water heated manifolds are generally considered to be better.

Quote
Lenght of the stem: The injector boss is designed for this purpose, so i assume the stem is allright!

Agree.

Quote
But thinking of it:  There is a 13mm hole in the manifold where the boss is sitting against. So maybe the fuel is spraying against the inside of this hole? Maybe i have to enlarge the hole?  Have to check.

Yes that could be blocking the spray.

Quote
Another thought:
As i have 1 throttle body, the two manifold runners are connected together. When 1 cilinder is doing the intake, it is effecting the air in the other runner.  With a proper dcoe throttle body the two runners become individual.  That's worth an experiment.  i still have a dcoe style carburettor somewhere. If i take out the venturies, i can use it as athrottle body! See if that makes a difference!

Yes that woule be easy. How many inlets do you have on your engine? Three or four? If the two middle runners are connected, then you have it all joined together anyway, even with a double-carb.

Quote
And it's a good idea to check the spraying pattern and the cc/min.

Especially pattern and how long they spray the fuel as it will tell you something about where the fuel is during idle.

- Anders


Title: Re: Let me introduce my maztra
Post by: krede on November 16, 2008, 08:31:19 pm
Like you suggest yourself, I ,too, would find a a twin dcoe throttlebody. (how about some from a motorcycle?.. you ought to be able to find some pretty cheap)

Failing that... how about fitting two smaller injectors in each pipe?? perhaps the big ones are simply not able to get the fuel mixed right at such low air velocities?

I think the way you mount the injectors seems sound enough... but then again perhaps not .... placing them in a "sharp bend" might be wrong.
The best way of fitting injectors is at an angle not more then 30 degrees, and aimed towards the middle of the inlet valve. (according to the wolf 3D instruction manual). But that might not be possible.

But first.. I would try the twin throttle plate set up.. and some other injectors.
How about fabricating four separate inlet runners?.. each with its own tb?
That would also sound AWESOME! especially at such high revs. :) 


Title: Re: Let me introduce my maztra
Post by: Bart_Maztra on November 16, 2008, 08:55:17 pm
Just saw some throttle bodies from a bmw R1100 on ebay. Those are 45mm. Interesting.....

But first try the carb as throttle body, and test the way the injectors spray.

The original manifold is heated by coolant, and the dcoe manifold isn't.  Before i started all this intake effort, i blocked off the coolant ports from the engine to the manifold. That way i could easily change the manifold without draining the coolant.
Last week i undo this blockage. The original carb would stay on for a longer period and with winter coming, heated manifold would be better. But that also means that if i want to experiment with the other intake, i have to drain the coolant.

To be thruthfull, i also have plans for the original carb. In America there are some guys who can modifie the carb. They change about anything on the carb and the result is outstanding! It has got my attention.
http://www.sterlingmetalworks.com/sterling.htm (http://www.sterlingmetalworks.com/sterling.htm)

Since the beginning of wankelness, my carb is not level. That is sorted now!  It has a aluminium spacer in a wedge shape.

(http://i3.photobucket.com/albums/y96/matramurena/IMG_0197-640.jpg)

(http://i3.photobucket.com/albums/y96/matramurena/DSC00891-640.jpg)

If i am wise, i forget all this and focus on my exhaust.  Even with the carb level, i still don't have the amount of power which i had in the mazda.  Must be the exhaust. So "Bart, be wise and sort that first!"


Title: Re: Let me introduce my maztra
Post by: krede on November 16, 2008, 09:06:17 pm
A carb might be cool as well... but I think injection is much more exciting.. :)


Title: Re: Let me introduce my maztra
Post by: Anders Dinsen on November 16, 2008, 11:00:00 pm

If i am wise, i forget all this and focus on my exhaust.  Even with the carb level, i still don't have the amount of power which i had in the mazda.  Must be the exhaust. So "Bart, be wise and sort that first!"

Your engine was longitudal before and is now transversally mounted. Have you rotated the carburettor so it's facing the same way as before with regards to direction of travel? Most carburettors are quite critical with this as float level changes during acceleration if it's mounted the wrong way 'round. DCOE's don't, but they are the exception.

The manifold design is really special.

Carb and your spacer look very good.

- Anders


Title: Re: Let me introduce my maztra
Post by: Bart_Maztra on November 22, 2008, 09:37:26 pm
Today the dutch RX-7 club had a meeting. They visited a custom exhaust manufacturer. Not just a manufacturer, but EPS, which is THE custom exhaust specialist from Holland and abroad.
Allthough i am not a member of the RX-7 club anymore, i was welkom to join this meeting.

A day well spent!  Learned a lot!  This was the big opportunity to ask the exhaust experts thousands of questions. They were very patience and enthusiast to help me forward with how to make a complete new exhaust system.

The plan is to make the flange which bolts to the engine from mild steel. Stainless is not suitable as flange.  The header will be made of 1 3/4" (44,5mm) stainless steel 304, wall thinknes 2mm.  I will be made of seperate bends and pipes welded together.  The bends will have the same diameter, as my current bends are narrower.  The shape will be roughly the same as the current one.  There will be two simular mufflers from borla pro xs.

(http://www.streetperformance.com/ART/PRODUCTS/100424/40352.jpg)

Gonna make it all by myself. Well, that's the plan. I will put this plan on top of the pile with all the other plans. (brake lines, carburettor, injection, vw beetle, mercedes c250, yamaha tdm, fix thousand things in my house, ...)

This is the current exhaust
(http://i3.photobucket.com/albums/y96/matramurena/spruiu.jpg)

(http://i3.photobucket.com/albums/y96/matramurena/matru.jpg)

The murena muffler is replaced by the mazda muffler.

(http://i3.photobucket.com/albums/y96/matramurena/maui.jpg)


Title: Re: Let me introduce my maztra
Post by: Bart_Maztra on February 26, 2009, 09:04:11 pm
Just made a start making the new manifold.
Bought some 50,8x2mm stainless pipe. (i could only buy one complete section of 6 meter....) And got some 90' elbows and two mufflers.  The mufflers were very cheap from kts.de for 66 euro each. These mufflers normaly costs 90 dollar in the usa or 130 euro here localy.

The exhaust flange will be lasercut from 12 or 15mm mild steel. I expect to get these in a week.

For now i use a temporarely flange so i can start "trail-and-error design"

(http://i3.photobucket.com/albums/y96/matramurena/DSC01013-640.jpg)

Started from the flange a 40' elbow goes up and ten with a 90' elbow diagonal down. Then with a 26'elbow horizontal, and straight around the corner. Just after the corner the 2 pipes joined, and then around the corner to the muffler.  The second muffler will fit directly on the first one. I hope i can fit these mufflers this way under the car.


Title: Re: Let me introduce my maztra
Post by: krede on February 26, 2009, 09:24:38 pm
I love reading about this project of yours...
What did you decide upon for fuel delivery?.. did you drop the injection all together? or are you giving it another chance?.... personally I think it would be a shame to go back to a carburettor on such a radical modification.. :)


Title: Re: Let me introduce my maztra
Post by: Bart_Maztra on February 26, 2009, 09:42:30 pm
Don't know yet. Fuel injection lost my interest for now. Maybe LPG injection???

(http://www.bs-autotune.nl/pics/LPG/LPG.JPG)

Just stick to my carb for now ::)


Title: Re: Let me introduce my maztra
Post by: krede on February 26, 2009, 09:47:57 pm
WOOOW! :)


Title: Re: Let me introduce my maztra
Post by: Bart_Maztra on March 03, 2009, 10:28:01 pm
Little progress so far.

(http://i3.photobucket.com/albums/y96/matramurena/IMG_1954-640.jpg)

The runners must be 60cm each.  The point where they join is in the bend.

(http://i3.photobucket.com/albums/y96/matramurena/IMG_1955-640.jpg)

The second runner will be very bendy to get the same lenght. 

(http://i3.photobucket.com/albums/y96/matramurena/IMG_1958-640.jpg)


Title: Re: Let me introduce my maztra
Post by: Bart_Maztra on March 05, 2009, 08:45:17 pm
bit more progress

The way the second runner runs is changed. As it is now, it fits in the engine bay. Enough clearance around the pipes.
Only i run out of 90'bends. Have to order some more.....

(http://i3.photobucket.com/albums/y96/matramurena/IMG_1996-640.jpg)

Today i received the flange, lasercut in 12mm steel. 2 off actualy ::). In case i messed one up.....
19 euro each, not bad.

(http://i3.photobucket.com/albums/y96/matramurena/IMG_2003-640.jpg)

Please ignore the piece of wood.

(http://i3.photobucket.com/albums/y96/matramurena/IMG_2007-640.jpg)

Next thing is to tack weld the pipes to the new flange, and see if i still can get it in position. It is already difficult to get the temporarly thin flange in position, so the real flange will be quite challenging....

Also have to think what to do with the movement of the manifold when the engine moves.  Have to make a flexibel joint somewhere.
 


Title: Re: Let me introduce my maztra
Post by: Bart_Maztra on March 14, 2009, 08:39:04 pm
Who says that rotary engines use a lot of oil?
On the contrary! The oil level is raising.

This week i checked the oil level, and it was a lot above maximum.
There should be about 4 liters oil in the sump. I drained the oil and it was 5,5 liter :o

Noticed no strange things on the oil. No signs of water.
It only can be the two stroke oil entering the sump.

During the convertion i modified the oil pump, which is adding some oil in the intake, like a two stroke engine.  Originaly it was pumping oil from the sump, but i modified it so it is using two stroke oil from a separate tank.  I blocked the pasage to the sump, and made a new entrypoint.  Think the blockage disapeared, so the two stroke oil is entering the sump.  :-[

Otherwide i don't have a clou what is happening.

The oil pump is well hidden behind engine mounts and drive shaft.  Big job to service the pump.  For the time being i drained the two stroke oil tank, and disconnected the oil lines from the intake.  Just poured some two-stroke oil directly in the fuel tank.

Mounted the old exhaust manifold, fixed a coolant leak, add some water-wetter stuff (very curious how that works) an went for a spin.  Today it was a beautiful day, and it was a real joy to drive.  Tommorow there is a local classic car show, and i am invited to show my car :)


Title: Re: Let me introduce my maztra
Post by: Bart_Maztra on June 18, 2009, 09:45:48 pm
Very little progress with the exhaust.

Bought a flexi from ebay.

(http://i3.photobucket.com/albums/y96/matramurena/IMG_3421-640.jpg)

It could better be called "stiff" instead of flexi.  It can only bend very little.  So not suitable as i planned. (anyone interested to buy a flexi ;))
So i have to come up with an other solution.

A few weeks ago i went to Romorantin with the maztra. I was a bit nervous if i would get any troubles, so i toke all my tools with me.  But it turned out just fine! No problems at all!
Oh, i just love my maztra! (after the trip even more ;))