Notices

924 GTP - 944 LM re-creation

 
Old 12-31-2014, 04:27 PM
  #31  
333pg333
Addict
Rennlist Member
 
333pg333's Avatar
 
Join Date: Feb 2006
Location: Australia
Posts: 18,491
Likes: 0
Received 0 Likes on 0 Posts
Default

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.
333pg333 is offline  
Old 01-04-2015, 08:40 AM
  #32  
Rom78
User
Thread Starter
 
Join Date: May 2010
Posts: 51
Likes: 0
Received 0 Likes on 0 Posts
Default

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

Rom78 is offline  
Old 01-04-2015, 10:15 AM
  #33  
Cyril
Addict
Rennlist Member
 
Cyril's Avatar
 
Join Date: Sep 2008
Location: Montreal
Posts: 430
Likes: 0
Received 0 Likes on 0 Posts
Default

Wow, really nice project and workmanship!
Thanks for sharing

Btw, ou es tu en France ? ;-)
Cyril is offline  
Old 01-04-2015, 03:34 PM
  #34  
333pg333
Addict
Rennlist Member
 
333pg333's Avatar
 
Join Date: Feb 2006
Location: Australia
Posts: 18,491
Likes: 0
Received 0 Likes on 0 Posts
Default

Yes, very nice indeed! 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.

http://www.ebay.com/itm/1981-Porsche..._Street_Legal_
333pg333 is offline  
Old 01-04-2015, 03:34 PM
  #35  
Rom78
User
Thread Starter
 
Join Date: May 2010
Posts: 51
Likes: 0
Received 0 Likes on 0 Posts
Default

Thank you Cyril

Je ne suis pas loin de Paris
Rom78 is offline  
Old 01-04-2015, 06:49 PM
  #36  
333pg333
Addict
Rennlist Member
 
333pg333's Avatar
 
Join Date: Feb 2006
Location: Australia
Posts: 18,491
Likes: 0
Received 0 Likes on 0 Posts
Default

Savez-vous Thom?
333pg333 is offline  
Old 01-05-2015, 04:26 AM
  #37  
Rom78
User
Thread Starter
 
Join Date: May 2010
Posts: 51
Likes: 0
Received 0 Likes on 0 Posts
Default

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.

I don't know Thom what is it ?

Last edited by Rom78; 01-05-2015 at 05:10 AM.
Rom78 is offline  
Old 01-05-2015, 05:55 AM
  #38  
Thom
Addict
Rennlist Member
 
Thom's Avatar
 
Join Date: Mar 2002
Posts: 4,038
Likes: 0
Received 0 Likes on 0 Posts
Default

Thom is me.

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?
Thom is offline  
Old 01-05-2015, 06:36 AM
  #39  
333pg333
Addict
Rennlist Member
 
333pg333's Avatar
 
Join Date: Feb 2006
Location: Australia
Posts: 18,491
Likes: 0
Received 0 Likes on 0 Posts
Default

Merci Bien Thom. ;-)
333pg333 is offline  
Old 01-05-2015, 09:09 AM
  #40  
Rom78
User
Thread Starter
 
Join Date: May 2010
Posts: 51
Likes: 0
Received 0 Likes on 0 Posts
Default

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.

It was the french minute sorry
Rom78 is offline  
Old 01-05-2015, 11:54 AM
  #41  
V2Rocket
Rainman
Rennlist Member
 
V2Rocket's Avatar
 
Join Date: Jan 2007
Location: Rancho Cucamonga, CA
Posts: 42,711
Likes: 0
Received 1 Like on 1 Post
Default

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?
V2Rocket is offline  
Old 01-05-2015, 11:55 AM
  #42  
V2Rocket
Rainman
Rennlist Member
 
V2Rocket's Avatar
 
Join Date: Jan 2007
Location: Rancho Cucamonga, CA
Posts: 42,711
Likes: 0
Received 1 Like on 1 Post
Default

Originally Posted by 333pg333 View Post
"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?
V2Rocket is offline  
Old 01-05-2015, 03:13 PM
  #43  
333pg333
Addict
Rennlist Member
 
333pg333's Avatar
 
Join Date: Feb 2006
Location: Australia
Posts: 18,491
Likes: 0
Received 0 Likes on 0 Posts
Default

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?
333pg333 is offline  
Old 01-05-2015, 03:15 PM
  #44  
333pg333
Addict
Rennlist Member
 
333pg333's Avatar
 
Join Date: Feb 2006
Location: Australia
Posts: 18,491
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by V2Rocket_aka944 View Post
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.
333pg333 is offline  
Old 01-06-2015, 05:59 AM
  #45  
Rom78
User
Thread Starter
 
Join Date: May 2010
Posts: 51
Likes: 0
Received 0 Likes on 0 Posts
Default

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.
Rom78 is offline  

Thread Tools
Search this Thread
Quick Reply: 924 GTP - 944 LM re-creation


Contact Us - About Us - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: