924Board.org

Qiknip · Joined: 15 Oct 2014 Posts: 5 Location: Crittenden, Kentucky

I'm a road course (Spec Miata) racer / car builder who's decided to build a 924 to run at Bonneville next summer in the 1.5-2.0 liter (non supercharged) class. The 924's aerodynamics was a big draw for me, but the engine may be the limiter. To beat the existing class record for the <2 liter production class I'll need a ~220 HP engine.
To date I've had zero luck finding an engine builder with any experience with modified 924 motors (for all the obvious reasons!). Any input for a candidate (preferrably in the midwest) that I can call to see how possible that HP goal is would be appreciated!
Rick
P.S. The SCTA land speed rules for the class permit virtually any engine modification except super charging, after market electronic fuel injection and, of course, increased displacement.
_________________
Qik Nip

fiat22turbo · Joined: 18 Jan 2006 Posts: 4040 Location: Portland, OR

Hmm, I don't know of anyone specializing in EA831 engine building in the states.

You might look at shops that specialize in VW/Audi stuff, since it would be familiar to them (lots of similarities with the old 1.8L SOHC motors) but the engine is so old and not exactly well known that you're almost better off finding a shop that is well versed in building a wide range of motors and work with them to figure out how to get that much power out of it.

There was a LSR 924 posted here someplace that you might be able to get a look at to get some ideas from.

I wish you luck with it!
_________________
Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose)

nickthompson · Joined: 26 Mar 2013 Posts: 873 Location: Central Georgia

I'm not sure 220hp N/A has ever been done. I think the DP cars were around 180 hp and those were not exactly reliable. Not saying it can't be done but you'd better get your wallet out. You might want to talk to ideola about a stroker engine but that would put you out of the 2.0 range. The limitations of the engine are well documented and the general consensus is the head is the biggest problem. It seems they don't flow well... I thought about looking for something from another car with the same bore spacing to get the head from but I decided to do a 1.8 VW swap instead.

daniel · Joined: 18 Jun 2009 Posts: 686 Location: Sydney, Australia

Are you allowed to change the head? What about the induction? If your rules allow appropriate mods, you will get the hp. It will cost you though!
_________________
Over the top of skyline, total brake failure.... hit the wall at over 200 kp/h at the dipper, so anyone who has to brake for the esses is a pussy.
1977.5 Race Car, CAMS Group S Spec
1989 944 Cabriolet

emoore924 · Joined: 13 Apr 2004 Posts: 2822

Call Peter Dawe in East Stroudsburg, PA. If it can be done, he's probably your guy. If it can't, he'll tell you.

Qiknip · Joined: 15 Oct 2014 Posts: 5 Location: Crittenden, Kentucky

Qiknip · Joined: 15 Oct 2014 Posts: 5 Location: Crittenden, Kentucky

Fasteddie313 · Joined: 29 Sep 2013 Posts: 2595 Location: MI

NO2? alcohol? meth?
_________________
80 Turbo - Slightly Modified

jimhuiz · Joined: 16 Dec 2013 Posts: 15 Location: Grand Rapids, MI

Michael Mount is near the midwest (Maryland) and has a long history and a great reputation with the 2.0 924. His experience goes all the way back to D Production "in the day".

I can PM you his address if you'd like.

Jim H.

Qiknip · Joined: 15 Oct 2014 Posts: 5 Location: Crittenden, Kentucky

Qiknip · Joined: 15 Oct 2014 Posts: 5 Location: Crittenden, Kentucky

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

I think you could get 220 on a single purpose build like this. EFI/EI make these lumps far more efficient than the DP cars, and it could have a silly cam and silly high compression. It doesn't have to to "drive-able" in the sense we are used to. . .it only has to get off the line, then accelerate through the gears toward terminal velocity.
_________________
Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

morghen · Joined: 21 Jan 2005 Posts: 9095 Location: Romania

emoore924 · Joined: 13 Apr 2004 Posts: 2822

Of note, Peter and Mike were DP competitors back in the day...

rallyimp · Joined: 26 Nov 2014 Posts: 10 Location: Atherstone, UK

I've been doing a bit of research on improving the engine my self for the rally car, and although I'm not expecting that sort of levels of power I've come across several rferances to 933's which used the turbo head on the NA engine to get power out so might be worht further investigation as a starting point
_________________
Regards

Chris Valentine

1981 Porsche 924 N/a Historic Rally Car
https://sites.google.com/site/valeracing09/home/porsche-924