| View previous topic :: View next topic |
| Author |
Message |
bruce76-924
Joined: 22 Feb 2007
Posts: 105
Location: Bradford, England
|
 Posted: Mon May 21, 2007 2:26 am Post subject: |
 |
|
Guys,
The 924 GTP was as Raceboy shows - 16 valve 2.5 litre and turbocharged. It didn't use the same head as any production 944 and likewise Porsche didn't build a 16 valve turbo 944. Even the short run of 968 turbos used the 8 valve 2.5 litre 951 engine. The engine picture that Morghen posted is not an original GTP engine.
Bruce.
_________________
1976 924 LHD, full cage, semi tube chassis, 951 brakes, lightweight 951 body panels.
1.8t engine conversion with Holset turbo and 6 speed Audi gearbox. |
|
| Back to top |
|
 |
Raceboy
Joined: 01 Mar 2004
Posts: 2326
Location: Estonia, Europe
|
| Posted: Mon May 21, 2007 2:35 am Post subject: |
|
|
| bruce76-924 wrote: | It didn't use the same head as any production 944 and likewise Porsche didn't build a 16 valve turbo 944.
Bruce. |
And I'm still going to call my white 924 a "GTP" after the 2.5 liter 16valve turbo engine is in!  Even though it has S head.
_________________
'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold 
'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche |
|
| Back to top |
|
|
dpw928
Joined: 02 Nov 2002
Posts: 1860
Location: owasso, ok 74055
|
| Posted: Mon May 21, 2007 3:39 am Post subject: |
|
|
That picture does look like the one I saw and agreed it does have a DOHC.  Anyone else notice that the real one doesn't have nose vents?
Dennis
_________________
81 931 5 sp
78 928 5 sp Silver
78 928 AT Euro Black |
|
| Back to top |
|
|
Rasta Monsta
Joined: 12 Jul 2006
Posts: 11732
Location: PacNW
|
| Posted: Mon May 21, 2007 3:47 am Post subject: |
|
|
| bruce76-924 wrote: | | It didn't use the same head as any production 944 and likewise Porsche didn't build a 16 valve turbo 944. |
944 Turbo S?
_________________
Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
|
|
| Back to top |
|
|
Joes924Racer
Joined: 03 Nov 2002
Posts: 11964
Location: Oregon, Denver Colorado native!
|
| Posted: Mon May 21, 2007 4:07 am Post subject: |
|
|
Yea raceboy the gtp motor was a thing of beauty I thuink there may be only one or 2 left intact if memory serves me well.. you seem pretty stoked on the gtp though I am too much more than the gtr. 
_________________
1979 porsche 924 Na
1980 porsche Turbo 931GT Replica
Have u ever driven a turbo.
Last edited by Joes924Racer on Mon May 21, 2007 5:39 am; edited 1 time in total |
|
| Back to top |
|
|
924 turbo
Joined: 02 Nov 2002
Posts: 1566
Location: Simi Valley, CA, USA
|
| Posted: Mon May 21, 2007 4:33 am Post subject: |
|
|
| Rasta Monsta wrote: | | bruce76-924 wrote: | | It didn't use the same head as any production 944 and likewise Porsche didn't build a 16 valve turbo 944. |
944 Turbo S? |
Not 16v. Even the 968 Turbo S/RS used the 8v head.
_________________
Jon Furst |
|
| Back to top |
|
|
bruce76-924
Joined: 22 Feb 2007
Posts: 105
Location: Bradford, England
|
| Posted: Mon May 21, 2007 4:57 am Post subject: |
|
|
Best of all, at 1.1 bar of boost ( for endurance racing ) they put out a quoted 420 bhp, but could have the boost wound up to 1.5 bar and produce 500 bhp. Kind of beats the average production 951!
Cheers, Bruce.
_________________
1976 924 LHD, full cage, semi tube chassis, 951 brakes, lightweight 951 body panels.
1.8t engine conversion with Holset turbo and 6 speed Audi gearbox. |
|
| Back to top |
|
|
Raceboy
Joined: 01 Mar 2004
Posts: 2326
Location: Estonia, Europe
|
| Posted: Mon May 21, 2007 5:38 am Post subject: |
|
|
Since it's a bit OT, but.....GTP spec engine would yield 500-550 hp @ 1-1.2 bar with Garrett GT35R that I'm going to use. It will be a killer combo: generously flowing head compared to modern ball-bearing and fast-spooling turbo.
I already have all the parts needed (2.5 block, 951 pistons, S head, new stainless valves, seals, bearings, turbo etc) sans clutch. I'll use S2 flywheel (60-2 tooth ring) not 951 flywheel and I'll have to find the best 225mm (like 931) clutch available.
_________________
'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold
'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche |
|
| Back to top |
|
|
Joes924Racer
Joined: 03 Nov 2002
Posts: 11964
Location: Oregon, Denver Colorado native!
|
| Posted: Mon May 21, 2007 5:40 am Post subject: |
|
|
awesome
_________________
1979 porsche 924 Na
1980 porsche Turbo 931GT Replica
Have u ever driven a turbo. |
|
| Back to top |
|
|
dpw928
Joined: 02 Nov 2002
Posts: 1860
Location: owasso, ok 74055
|
| Posted: Mon May 21, 2007 6:35 am Post subject: |
|
|
| Raceboy wrote: | | I'll use S2 flywheel (60-2 tooth ring) not 951 flywheel and I'll have to find the best 225mm (like 931) clutch available. |
Don't know how it would fit but the high HP 928 racers are going back to the early 928 twin disc clutch setup.
Dennis
_________________
81 931 5 sp
78 928 5 sp Silver
78 928 AT Euro Black |
|
| Back to top |
|
|
bruce76-924
Joined: 22 Feb 2007
Posts: 105
Location: Bradford, England
|
| Posted: Mon May 21, 2007 7:57 am Post subject: |
|
|
Raceboy,
If you can build it ( and I'm pretty sure you can), then we can let you call a GTP!!! After all, I read that the P in GTP refered to prototype and I guess your motor would fit that description..... good luck with it.
Cheers, Bruce.
_________________
1976 924 LHD, full cage, semi tube chassis, 951 brakes, lightweight 951 body panels.
1.8t engine conversion with Holset turbo and 6 speed Audi gearbox. |
|
| Back to top |
|
|
J1NX3D
Joined: 06 Feb 2003
Posts: 1333
Location: New Zealand
|
| Posted: Mon May 21, 2007 10:00 am Post subject: |
|
|
| dpw928 wrote: | BTW the engine pictured above appears to be a 944S engine due to the single timing gear. Also, that appears to be a production head, not a one off (or 4 off) developmental head.
Dennis |
yes thats right. people are confusing the 924 gtp ( with the 944 dohc turbo engine) and the 944 gtp ( with the S or S2 engine, i cant remember which.)
_________________
'86 944 |
|
| Back to top |
|
|
morghen
Joined: 21 Jan 2005
Posts: 9080
Location: Romania
|
| Posted: Mon May 21, 2007 6:24 pm Post subject: |
|
|
no, the picture that i posted is indeed a 944 dohc engine and i've only re-posted the picture because paul's post did not show the picture.
As i know the GTP has indeed a DOHC engine i've seen that picture and i had others with close-ups on that engine but i lost them.
_________________
Supercharger and EFI kits
https://www.the924.com |
|
| Back to top |
|
|
J1NX3D
Joined: 06 Feb 2003
Posts: 1333
Location: New Zealand
|
|
| Back to top |
|
|
Raceboy
Joined: 01 Mar 2004
Posts: 2326
Location: Estonia, Europe
|
| Posted: Tue May 22, 2007 3:58 pm Post subject: |
|
|
924 GTP is NOT 944 Turbo engined! This was a prototype 16valve turbo engine and none of the 924/944/968 turbocharged engines were released with 16valve heads.
_________________
'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold
'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche |
|
| Back to top |
|
|
|
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
924 FAQ (Technical)
