924Board.org

931fan · Joined: 03 May 2008 Posts: 5 Location: Basingstoke

I've sent a mail to a well respected engine builder here in the UK http://www.ricwood.com/ and asked him what he thinks is possible. He's 'the man' when it comes to making the most out of what you've got!!

In the mean time I found another couple of pictures you might be interested in. The first is at Brands hatch but the more interesting one taken at Cadwell is of all the cars on the grid over 30 924 race cars that day I think. My first race at Castle Combe had 39 924 racers on the grid!!

I'll let you know what Rik thinks is possible when I hear back.

Steve
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Whether you think you can or think you can't - you are right.

924RACR · Posted: Sun Jul 18, 2010 5:07 am Post subject:

Onna these days I need to get my FIA license, drop in on the fams in the old country and do a guest spot appearance...

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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

emoore924 · Joined: 13 Apr 2004 Posts: 2822

I have an n/a project coming online in a month or so that I have high hopes for. I don't want to tip my hand on the build sheet but let's say there were some pretty extensive mods being done as part of the build. I would like to get it all running and dynoed before I say too much but stay tuned...

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

Ed, can't wait for the details!
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erstwhile owner of just about every 924 variant ever made

emoore924 · Joined: 13 Apr 2004 Posts: 2822

Not fully baked yet but coming soon...

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

Bump for an update from 931Fan and from Ed on his NA build...

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erstwhile owner of just about every 924 variant ever made

tyfighter123 · Joined: 19 Jan 2010 Posts: 551 Location: Colorado

It seems like everytime a thread gets good it goes cold..... there are so many posts that end with "I will post more soon" and then they die! Emoore I would love to see what you did with your build.
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Porsche 924 1977 N/A
Mustang GT/CS 2007
Porsche 924S 1987 (parts car)(cut up and recycled)
Porsche 911S 1976
Porsche 931 1980
Porsche 931 1980 (parts car)

emoore924 · Joined: 13 Apr 2004 Posts: 2822

Mine is out there. Search for "before and after"

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

simsport · Joined: 06 Nov 2002 Posts: 573 Location: UK Warrington

I think the answer with the NA car is to do the expected stuff, ie sort the flow across the head, yes good old inlet and exhaust, big valves etc and then make the internals as light as possible (light rods, pistons, valves and buckets) and increase the available revs. Power is work and time after all.

The other thing is to make it easy to drive and that does not mean stripping all the weight out, or at least it means being smart about it.

The 924 handles as well as it does because of its great weight distribution, strip out too much over the rear wheels and you will find it still handles pretty well in the corners but traction out of them will be a real issue and in the wet a nightmare. Just my thoughts.

Cheers
Simon
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Blown is always best!

924RACR · Posted: Thu Mar 08, 2012 10:51 pm Post subject:

Simon's comments bring to mind also... be careful about planning on high revs. We've found - the hard way - that the lifter buckets are a weak point, at least in stock form. I don't think they're good for more than 7000rpm, and we normally limit our shifting to 6000 on our racecar for longevity! Stock ones crack at the valve adjuster holes.

Otherwise you'll want to talk to Dan about his solid lifter project...
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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

Yeah, bigger cam, stiffer springs (as with the big valve head) and the Sten Parner solid lifters should help raise the RPM limit a little bit, but I don't want to be the guinea pig to find out how high! FWIW, I have a small shipment of the Sten Parner lifters on the way, 2 of 5 sets are already spoken for...
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erstwhile owner of just about every 924 variant ever made

Cedric · Joined: 27 Aug 2004 Posts: 2822 Location: Sweden

I read a google translated article about this guy running a n/a in eiffel rennen 300km. Placed pretty good i must say:

http://www.motor-klassik.de/rennsport/eifelrennen-im-porsche-924-nach-hausfrauenart-2985471.html

Really fun to see the last years results, several 924s, both n/a turbo and GTS according to the results list. Really good results to. A really tough event for historic racing cars. I think he says 155hp with webers, head port and cam, tuned for endurance racing.

Google translate it and read yourself !

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1980 924 Turbo
www.instagram.com/garagecedric/

emoore924 · Joined: 13 Apr 2004 Posts: 2822

That article is a hoot, especially with the strange translation.

My favorite line:

tyfighter123 · Joined: 19 Jan 2010 Posts: 551 Location: Colorado

Dan is putting together the big valve kit with the stiffer springs and solid lifters for me. I also am going to use a set of Diamond pistons with 10.5:1 compression. I am also going to put in a scrapper. What else do you guys think I should do?
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Porsche 924 1977 N/A
Mustang GT/CS 2007
Porsche 924S 1987 (parts car)(cut up and recycled)
Porsche 911S 1976
Porsche 931 1980
Porsche 931 1980 (parts car)