MatraSport Forum

Hello Members. Thanks to all those who replied to my under windscreen panel.The car I purchased is a Gordon Russell special i.e. uprated to S spec.Twin dellortos,ast road cam. four branch and 4 outlet exhaust. Can this conversion be reversed or tamed down  to make car more civalised.regardsTOG

Well I have all the standard carbs ETC if wanted!

Or fit an air box on the carbs the reduce the intake noise and temps or do you want less power?

. there is no room for an airbox just the 2 thin  pan filters..Icannot exploit the power because over 3500 rpm the noise just overpowers you and  you lose the ability to ,determin what is making what noise ie ;is it a wheel bearing noise ,is there a bushen knocking or is there a gearbox drone. In other words I cannot feel as one with the car.I probably sound crazy to you but  I am determined to enjoy this car and just need a bit of advice from other murena  owners. Regards TOG

I think I know what you are thinking about, having side draught webers on my car, though with an airbox. My installation is a little different from yours, being based on a copy of the original S-manifold, which has the carbs sitting in a 15 degree tilted position. The inlet is thus well above the fuel tank.

Here's a photo of my installation:
(http://gallery.dinsen.net/d/12314-2/DSC_5252.JPG)

The usual solution with the straight manifold like you have is to reduce the size of the fuel tank, usually by cutting it off an glueing/plastic welding it together. That will allow an airbox to be fitted.

The alternative is to fit a single downdraught carb on the standard manifold. The Holbay Fast Road cam deals very well with this induction system on the Solex 34CIC carb from the standard 2.2. I used to have this setup, including the 4-in-1 exhaust manifol until I converted to sidedraughts on mine, and the standard cam still allows plenty of breathing to the cam and the engine spins happily past 6500 rpm. So you will not miss much power with that installation, but the sound will be much different - lower, that is. This is a bolt-on conversion. Fuel supply may have to be changed a bit, though, depending on how it is installed now.

This is my engine room before with the single carb:
(http://gallery.dinsen.net/d/1393-2/DSC_0200.JPG)

/Anders

hello Anders nice looking setup in your picture.Do you think i would be possible to get an offset manifold and airbox to suit the twin 45 dellortos on my car.do you still use your 4 branch with the webbers.Is there any way to identify the cam in my engine.Sorry to be babbling on but one last question was the 2.2 S model  lumpy and noisy .regards TOG

Here You can hear my very original S Murena:
http://www.youtube.com/watch?v=aJol0gtwpgc (http://www.youtube.com/watch?v=aJol0gtwpgc)

It's not so bad, me and my wife in 4th month of pregnancy, we've spent 4 days and cca 3000kms in Murena S last year and our baby now just love driving in car and is always sleeping (except of my company Skoda Octavia II which is horrible uncomfotable).

No problem, Tog.

The manifold was offered by Simon, he still advertises it, but I don't know if he has any. It's a replica of the original S-manifold. http://www.simon-auto.de/

My airbox was welded up made by a friend out of mild iron plate. I have the drawings if you want to copy.

Yes, I'm still using the 4-in-1 exhaust with the Weber's.

Your car is Zac's old car, right? If so, ask Roy Gillard - he would know for certain what cam you have. I think it has been well prepared.

The 2.2S is not noisy since it also has an airbox on the inlet. Here is a photo of the installation:
http://gallery.dinsen.net/v/biler/Matra/technical/carb/other/DSC_0386.JPG.html

/Anders

Anders: so You have Webers 40 + S cam + 4-1 pipes, am I right? Do You know the power of the engine?

Tog: simmilar question to You - if I understood well, You have Dell'Ortos 45 + cam (nobody knows which) + 4-1 pipes, and how many HP?

hello again Anders.I actually purchased the car DPR 53Y dark blue  through Gordon Russell from some Belgian guy who used the car when in England. TOG

to michaeltalbot the upgrade to my car was carried out byGordon Russell in the eightees and produce approx 140 hp according to Gordon.regards TOG

I think  this is George Bell's old car that was advertised in the UK Matra Club magazine over the last couple of months.

Some UK members on here will know the car.

Any Photos?

No, it's not that car Anders.  Jean-Luc Girard has bought that Murena.

This one was George Bell's car.  I suspect it has a Holbay cam, particularly if it was done by SCU in the eighties, but many of those cars were not set up well in my experience and opinion and the 45 carbs. are too big, drink fuel and the power and delivery is not as good as yours was when you got it from me.

Roy

And still is, even with my twin sidedraughts ;)

I tend to agree on the 45 carbs, they won't add anything. The Holbay breathes well through 40 mm carbs. And the single carb, as well.

He, I know that car.
It was indeed noisy.
(http://i32.tinypic.com/10z73pl.jpg)
(http://i28.tinypic.com/8y6v85.jpg)

Sounds like the exhaust might be the cause of your problem.

I would be interested in swapping my single output stainless steel exhaust for your four output version.  I do not intend to do much cruising on dual carriageways or motorways in the Western Isles so a bit of extra noise would not be a problem  ;D

Believe me, this noise wil make you go nuts on a long run.
The Devil pipes are very usable for the end tips.
They look smooth an easy to weld on like I did.
They give a little  bit extra sound.
Just what I wanted.

hello men. If i was to pick up a pair of twin 40 webers would hey have to be jetted specifically fo the murena.Is there an off the shelf airbox available,I know Anders got an airbox specially made . regards Tog

Hi Tog, no they can always be rejetted. All jets are available for the Webers, as well as for your Dellorto's. For example from Eurocarb: http://www.dellorto.co.uk/

You will however need to have them setup either on the road with a wide band lambda, or professionally on a rolling road.

Pipercross has some nice airboxes, but I found them too expensive, plus they have built in filter and I wanted to preserve the original filter setup.

http://www.pipercross.net/competition/products_600_airbox.asp

/Anders

hello Anders. I was looking at your pics .the car that was taken appart.What  became of the body panels especially the driver side rear quarter panel. regardsTOG

Unfortunetly when nobody wanted any more spares from the car the rest of is was sent to a scrapyard

Oh man... Haven't you learned... You NEVER throw parts out.

You never know when they come in handy.

You just have to move to a larger house from time to time. ;D

It's a sin.
Shame on you.
However if there is no space to hold the parts I can understand.

I did not through any ting out! Waldemar did it! His father refused to store more crap on his factory compound.
Hans