Show full size 924Board.org
Discussion Forum of 924.org
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 
 Technical FAQ924 FAQ (Technical)   Technical924 Technical Section   Jump to 924.org924.org   Jump to PCA 924 Registry924 Registry

Forged conrods manufacturing
Goto page Previous  1, 2
 
Post new topic   Reply to topic    924Board.org Forum Index -> Performance Upgrades
View previous topic :: View next topic  
Author Message
gegge  



Joined: 27 Jul 2007
Posts: 1085
Location: Sweden

PostPosted: Fri Jul 10, 2020 5:31 pm    Post subject: Reply with quote

The forged rods, are they a direct OEM replament for stock pistons with the HUGE (diesel) wrist pin?

The reason for asking is that aftermarket pistons seldom use 24mm and a light strong rod to match a heavy marchmallow piston doesnt make sense to me.

Would it be possible to make the same rod with different sizes of the small end bushing? Im am looking for 22mm for exemple.
_________________
Carl Fredrik Torkildsen

924 turbo -81 Carrera GT RESTOMOD
924 turbo -80 Dolomite De Luxe
924 -85 DP kit, BBS RS, M030 and tuned engine
924s -86 Black on black turbo with Fuchs
Back to top
View user's profile Send private message
Coco_Lev  



Joined: 04 May 2020
Posts: 37
Location: France

PostPosted: Sat Jul 18, 2020 2:42 am    Post subject: Reply with quote

safe wrote:
Coco, valves looks hard to find, for the NA 924 (I need exhaust valves right now).

You don't have connections that can make some nice stainless inlet and exhaust valves, maybe even 1 or 2 mm oversize?
I would by at least 2 sets.


Sorry guys I'm late.
Yes don't worry it's on the track yet.
Back to top
View user's profile Send private message
Coco_Lev  



Joined: 04 May 2020
Posts: 37
Location: France

PostPosted: Sat Jul 18, 2020 2:44 am    Post subject: Reply with quote

Cdric wrote:
How have you done with the piston cooling oil squirter hole? Are there any sets extra available?


It's drilled on the CNC. With two different tools in order to respect different holes diameters. This is necessary to obtain a low oil emerging section in order to get a powerful oil flow to sufficiently cool the piston.
Yes there are some sets still available


Last edited by Coco_Lev on Sun Jul 19, 2020 6:38 pm; edited 1 time in total
Back to top
View user's profile Send private message
Coco_Lev  



Joined: 04 May 2020
Posts: 37
Location: France

PostPosted: Sun Jul 19, 2020 6:16 pm    Post subject: Reply with quote

gegge wrote:
The forged rods, are they a direct OEM replament for stock pistons with the HUGE (diesel) wrist pin?

The reason for asking is that aftermarket pistons seldom use 24mm and a light strong rod to match a heavy marchmallow piston doesnt make sense to me.

Would it be possible to make the same rod with different sizes of the small end bushing? Im am looking for 22mm for exemple.


Only one size will be available as it requires to build another special forging matrix, which is very expensive.
The piston pin diameter is maybe a bit consequent. However you have to know that the piston pin is very long. As a consequence, its bending deformation has to be as fewer as possible because the consequences can be dramatic.
Exemple of a rod foot fatigue failure on a peugeot 505 turbo, due to the high pressure contacts and then the knocks of the piston pin after 100kms:

That's why a big diameter is highly recommended for this part. It will be direct OEM replacement with 24mm piston pin. You have to know that the stiffness depends on the diameter power 4, as the weight only depends on the squared diameter.

What is possible to do, is asking a machinist to reduce the length of your piston pin in order to reduce its deformation and lower the weight of the part. You have to adapt a new fitting in the piston boss. The deformation depends on the cube diameter (without considering the piston boss deformation that is also linked).
However this is a high risqued operation, as this shouldn't be done anyhow, by anyone.


Last edited by Coco_Lev on Fri Jul 24, 2020 10:24 pm; edited 7 times in total
Back to top
View user's profile Send private message
gegge  



Joined: 27 Jul 2007
Posts: 1085
Location: Sweden

PostPosted: Sun Jul 19, 2020 6:26 pm    Post subject: Reply with quote

Then I have to withdraw my interest in this then.
_________________
Carl Fredrik Torkildsen

924 turbo -81 Carrera GT RESTOMOD
924 turbo -80 Dolomite De Luxe
924 -85 DP kit, BBS RS, M030 and tuned engine
924s -86 Black on black turbo with Fuchs
Back to top
View user's profile Send private message
Euro924S2  



Joined: 06 Mar 2008
Posts: 186
Location: UK

PostPosted: Thu Oct 22, 2020 8:22 am    Post subject: Reply with quote

Just seen this thread! I’d be keen to buy a set for my 16v engine build (shipped to the UK) if they are still going ahead?

Cheers, John.
_________________
UK spec '83 N/A with 931 motor with Eaton MP62 'charger @ 15psi. EFI - 565cc inj. Standalone Adaptronic ECU. 951 FMIC. Ally rad. Twin throttle. Recirc valve. Custom manifolds and CAI. 232bhp
Back to top
View user's profile Send private message
Coco_Lev  



Joined: 04 May 2020
Posts: 37
Location: France

PostPosted: Mon Oct 26, 2020 5:26 pm    Post subject: Reply with quote

Euro924S2 wrote:
Just seen this thread! I’d be keen to buy a set for my 16v engine build (shipped to the UK) if they are still going ahead?

Cheers, John.


Hi John,

Yes they will come but not now for the moment. It will be in the beginning of 2021.

Kind regards, Corentin
Back to top
View user's profile Send private message
safe  



Joined: 18 Mar 2017
Posts: 188
Location: Sweden

PostPosted: Mon Oct 26, 2020 6:20 pm    Post subject: Reply with quote

Coco_Lev wrote:
Euro924S2 wrote:
Just seen this thread! I’d be keen to buy a set for my 16v engine build (shipped to the UK) if they are still going ahead?

Cheers, John.


Hi John,

Yes they will come but not now for the moment. It will be in the beginning of 2021.

Best regards, Corentin


Thanks for the update!
Back to top
View user's profile Send private message
Euro924S2  



Joined: 06 Mar 2008
Posts: 186
Location: UK

PostPosted: Mon Nov 02, 2020 6:23 am    Post subject: Reply with quote

Ok, thanks. I’m guessing Covid isn’t helping your time scales! I’m still keen on a set for the time being but intending to be building the engine in the new year (2021) once the prototype engine is running in the next few weeks so the sooner the better please!
_________________
UK spec '83 N/A with 931 motor with Eaton MP62 'charger @ 15psi. EFI - 565cc inj. Standalone Adaptronic ECU. 951 FMIC. Ally rad. Twin throttle. Recirc valve. Custom manifolds and CAI. 232bhp
Back to top
View user's profile Send private message
Coco_Lev  



Joined: 04 May 2020
Posts: 37
Location: France

PostPosted: Fri Nov 27, 2020 9:34 pm    Post subject: Reply with quote

Parts must be ready within few weeks
Back to top
View user's profile Send private message
Euro924S2  



Joined: 06 Mar 2008
Posts: 186
Location: UK

PostPosted: Fri Nov 27, 2020 11:09 pm    Post subject: Reply with quote

That’s great news! Keep us updated!
_________________
UK spec '83 N/A with 931 motor with Eaton MP62 'charger @ 15psi. EFI - 565cc inj. Standalone Adaptronic ECU. 951 FMIC. Ally rad. Twin throttle. Recirc valve. Custom manifolds and CAI. 232bhp
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    924Board.org Forum Index -> Performance Upgrades All times are GMT + 11 Hours
Goto page Previous  1, 2
Page 2 of 2

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group