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I'd like to see more pics on your cam drive system if possible. Also, what pistons are you going to use? Be nice to put some light pistons and rods in there.
I didn't come since the post has moved here and what a surprise to see so much comments. Thank you very much to all. It's a pleasure to share this project with you.
As you can imagine, Christmas holidays were the opportunity to work on the GTP and we tried to use all the "free time" we had
The progress is visible for us, the car is now fully white and looks more and more like a car we all know.
We made the definitive adjustements of the exhaust manifold (and 333pg333 you'll can see a view of the double cam shaft pulley). I can reassure you pistons and rods are "costly specifics" for this type of turbocharged engine
We also had the possibility to adjust the air and oil coolers. We only have to add some screws and bolts everywhere now and it'll be ok
As i imagine you have enough of my unnecessary explanations lets share some pictures
Coming back from surface treatment
Last shot before leaving. Something like in Zuffenhausen
What c/r did you settle on? Also, what ECU?
Here's a link to an Ebay sale going on now. Lots of very good pictures for reference.
Don't know what is c/r ?
Concerning the ECU the best should be Bosch of course but absolutely over the cost we can invest. We're thinking about MOTEC or Sybel it'll depend of the opportunity we'll have.
Thank you for the ebay link. Nice car. I used the same principe for the turbo exhaust. I think it's was the same for 80's, 81's le Mans cars and others race gtr. The position of the turbo was everytime on the left bottom side.
Du beau boulot... pour le moteur vous restez sur un 2.5 plus ou moins standard avec bloc et embiellage d'origine?
Quid des pistons et du taux de compression?
Merci pour le compliment. Content de retrouver un Français ici
Niveau moteur nous avons modifié bielles, pistons avec calottes spécifiques pour réduire le taux de compression le tout dans un bloc re-chemisé . Nous sommes également passés en soupapes inconel. Le tout huilé en carter sec avec lub. sous les calottes. Sans parler du basic de joint de culasse renforcé. Seul le vilo reste d'origine tout juste rééquilibré.
"No way to reinforce the head. What I suggest we do is to counter bore the boss and fit a “press fit” stepped washer as a head washer. Maybe the head cracks due to the head boss “bore” collapsing inwards when the head nut is tightened. This is a common failure on heads. They make the bore in the head larger than the stud and when the nut is tightened the aluminum material around the head boss bore collapses. This is a common cause for head gasket failures too. The tensile goes into collapsing the head instead of stretching the head stud evenly and giving an even crush on the H gasket."
by this do you mean a sort of flanged sleeve bushing "T" profile pressed into the head-bolt bore but with the flange being between the head nut/washer and the actual aluminum?
So you used modified stock rods and pistons...or did I misunderstand you Rom? What c/r (compression ratio) did you finish with? Any pics of the block without the head on it?
by this do you mean a sort of flanged sleeve bushing "T" profile pressed into the head-bolt bore but with the flange being between the head nut/washer and the actual aluminum?
Spencer...pretty much that was what he was saying I believe. We're not going with the S head now so probably won't be doing this.
Did you custom-fab that dual-pulley cam drive?
What does such a setup cost? Will you have to bump the hood to clear that smaller gear?
Yes we made all the adaptation by ourself thanks to the lathe you can see in the back of the workshop . The smaller gear is in the hood air duct like the original car.
For us the cost was free time and raw material price. But as you said this adaptation is possible when the engine is in a lowest position with a air duct on the hood.
So you used modified stock rods and pistons...or did I misunderstand you Rom? What c/r (compression ratio) did you finish with? Any pics of the block without the head on it?
Unfortunately i can't give you precise informations on this topic not because i don't want but because i don't really know such details. Internal engine modifications were more my brother's work. All i can say is that pistons, rods and valves are completely new 'race' parts we bought for the same price as gold
It's everytime the same when the inscription "race" is on the package.
12-31-2014, 04:27 PM
