MatraSport Forum

Hello, I search for docs, parts ROC or JRD engine etc for my Politecnic ex Beltoise Murena 4 WD

That's a very rare beast you have there. Roy may know something about these engines?, which I think are based on the Simca block, but with a custom cylinder head. What kind of documentation are you looking for? I'd very much like to hear more about your car.

And a warm welcome to the forum!
/Anders

Like Anders, I am interested in knowing more about your car. Could you post some photos perhaps? :)

Tell us more, photo's would be nice! I'd like to know more about how our cars did when competeing, I here it made a good rally cross car and a few were enter in to rallies, i.e. monte carlo and RAC.. Canty find much on the web though, just a few pictures..

The Murena's won the French rally championships in 1982 and 83 I think, so they did very well :)

photo's of rally car, and ROC engine

Eric


(http://img22.imageshack.us/img22/3884/protomur1.th.jpg) (http://img22.imageshack.us/my.php?image=protomur1.jpg)

(http://img22.imageshack.us/img22/4131/protomur3p.th.jpg) (http://img22.imageshack.us/my.php?image=protomur3p.jpg)

(http://img527.imageshack.us/img527/8642/post1141233523514.th.jpg) (http://img527.imageshack.us/my.php?image=post1141233523514.jpg)


(http://img527.imageshack.us/img527/1882/protomur2.th.jpg) (http://img527.imageshack.us/my.php?image=protomur2.jpg)

(http://img527.imageshack.us/img527/3453/motroc.th.jpg) (http://img527.imageshack.us/my.php?image=motroc.jpg)

Hard to believe that someone would just leave such a car outside to rot.

And oh!. how cool it would be if those 16valve heads could be reproduced.

 8)Hallo you meant this one Krede

(http://img527.imageshack.us/img527/1208/culasseroc2oz3.th.jpg) (http://img527.imageshack.us/my.php?image=culasseroc2oz3.jpg)

Yes eric.. I saw that pic on the Dutch forum some time ago.
It would be awesome if they could still be had..
But it would probably be much easier to simply fit another engine....  :-\

Or you could start with this injection system from Politecnic.  ;D

I already have throttle bodies, and injection on my car mate :)

 8)
That's correct ,I posted it on the forum, it was for sale on  'matra-passion 'forum in France

Eric

Krede wrote: Hard to believe that someone would just leave such a car outside to rot.

I think that it is normal that after the racing seasons nobody cares about the used racing cars. Some years will pass before some enthusiast wants to save the cars.
I presently read that SAAB in the good old days converted there ex-rally cars back to standard specifications and sold them as normal second hand cars in order to save money.
One of the ex- SAAB rally cars has a few years beck been purchased by some enthusiasts from an old lady who used for her daily transport, and the car was again converted to its original rally specifications!

Hans

I am envious  ;) Did you convert the original engine or replace it with one that already had injection?

If you converted, what else was involved, besides mounting the new intake manifold and the injector system?

If you search the forum there's a post about the whole thing somewhere... but what I did was to fit the throttle bodies to the manifold what was used for the twon carbs on the car when I bought it. (politec one I think.. it doesnt have the "angle " of the standard S manifold).
Then I had a distributor from a 505 turbo fitted with a pickup to enable sequential ignition/injection, and finally it was fittet with a programmable ecu to control the lot..

Conclusion : It doesnt feel any faster than before... it has better response than with the carbs.. slightly better fuel economy... but its definitely not worth the cost. 

Yes, the blue car is the car . Needs restauration, we start next week.
I have more photos, if somebody want to post them for me, send me a email.
I m looking to buy parts if you known some for sale.
Thank You in advance   olczyk@yahoo.com
Car was race by Beltoise 4 WD, ROC Engine . 800 Kg and 360 HP

KEEP US POSTED !

A few photos from Olczyk:

(http://gallery.dinsen.net/d/12829-1/murenacoteac2.jpg)

(http://gallery.dinsen.net/d/12827-2/beltoise_gsi_pres82.jpg)

(http://gallery.dinsen.net/d/12836-2/Photo+006.jpg)

(http://gallery.dinsen.net/d/12833-2/Photo+004.jpg)

Good thing its a Murena... any "lesser" car would have rotted away by now for sure!! :)

WOW!!! :o Congratulations to this very rare car!  ;)

Interesting way to distribute the load when changing the front suspension. The torsion bars normally transfer the load to where they are mounted in the main chassis frame, which is the reason the people with coil-over conversions might run into problems with chassis flexing.

I wonder if the torsion bars on this car were retained, and the horizontal coil-overs only were additive ? - however judging from the amount of reinforcing it might be a complete conversion. 

I agree with Hans that it is astonishing anybody could leave such an obvious classic/famous car outside to rot - but at least it is now in good hands. I look as much forward to follow this project as anyone here.

/Lennart

I'd SOOOOOoo like to see some pictures of the engine/enginebay

Krede, there is a photo of the engine bay, it's the one with dual dampers/coils either side. The engine is fitted longitudally on these cars, with a shaft passing on the right side of the engine to drive the front differential.

Lennart, my guess is that the suspension arrangement is chosen for ease maintenance. Suspension is more or less everything on a rally car, and by putting everything inboard on top, you have very easy access to making adjustments etc. My guess is that they have discareded the torsion bars.

But I was a bit surprised to see that the original front suspension arms (at least the top ones) have been kept - since the car is more or less completely custom anyway, why not extend the a-arms, which generally lowers the roll centre? The a-arms on Murena are only this short because they come from a front engined car... The rear looks like the trailing arms have been discarded and the entire rear suspension is custom.

There's a sister car to Olczyk's in the museum in Romoratin, but it's covered up so the internals aren't visible :(

/Anders

Having had a closer look at the picture of the engine bay (picture 004). I actualy spotted the drive shaft takeing part of the power to the front whels. It can be seen a little to the rigth for the center of the pictur.

Hans

is this the same powertrain that was in the citroen bx 4wd rally?

love this car.  And the pushrods on the a-arms are nice.  maybe its a easy fit?

We start restoration this week