924Board.org

Una · Joined: 23 Sep 2007 Posts: 30 Location: Port Orchard, WA

So I've dug through the archives. Sounds like this is the best bang for the buck engine swap I can do to my '82 924. The engine in my 924 is pretty tired, compression is all over the place from 100 to 150. Might just need a valve job, but for the price of a valve job, I can get a good used 20valve Audi engine off of Craigslist. Sounds like it'll bolt right up to the bellhousing. I think I read that the motor mounts will still bolt up? That'd be awesome, but I'm ok with some fabrication to deal with that. Ignition and fuel injection are no biggie, I put a '99 Dodge Stratus motor into an '88 Dodge Omni and kept the '99 factory crank trigger, coil pack, and fuel injection on engine thanks to Megasquirt. I plan to do the same with the 20v Audi engine, maybe even ditch the distributor and run COP (coil on plugs). There definitely seems to be room in the front of the engine bay for the extra cylinder..

Any words of advice? I may start a blog to keep track of my progress, if I do, I'll link to it.

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Brian near Seattle, WA
'82 Porsche 924

Una · Joined: 23 Sep 2007 Posts: 30 Location: Port Orchard, WA

Oil pan.. Might not clear, and the engine has a cast aluminum pan. I've heard some of these engines came with a steel oil pan, I'll need to track one of those down, much easier to modify. 33 views of this thread, and no replies.. Nobody done this swap before? heh..
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Brian near Seattle, WA
'82 Porsche 924

Una · Joined: 23 Sep 2007 Posts: 30 Location: Port Orchard, WA

I setup the blog today.. Check it out here if you want to keep track of my progress.
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Brian near Seattle, WA
'82 Porsche 924

colin · Joined: 24 Dec 2006 Posts: 103 Location: iowa, US

what di you do with the old parts? do u still have the head? is it in good shape, how much would you want for it?
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1979 924 parting ways
1987 924S
1987 parts car

Una · Joined: 23 Sep 2007 Posts: 30 Location: Port Orchard, WA

I'll shoot you a PM.. Yeah, all old parts are still available.
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Brian near Seattle, WA
'82 Porsche 924

Una · Joined: 23 Sep 2007 Posts: 30 Location: Port Orchard, WA

Updated the blog.. Have a look..
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Brian near Seattle, WA
'82 Porsche 924

zimm · Joined: 18 Oct 2006 Posts: 62 Location: Hereford, UK.

just checked out your blog..

something dont quite add up there does it ..

hope you get it sorted

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6 bikes, 9 cars, 1 van.... the more you have the less they work.

Una · Joined: 23 Sep 2007 Posts: 30 Location: Port Orchard, WA

The motor mounts from the original 4 cylinder engine DO NOT BOLT UP! The bolt pattern is about 1" bigger around on the block, both sides, no two bolts are close enough to be used, they're all spaced father out. The 931 bellhousing doesn't clear the flywheel still, not to mention, even if it did, the flywheel teeth are now on the wrong side. there is NO WAY you could use a 931 flywheel on this 5 cylinder engine, the crankshaft is just far too different.

This swap being a bolt in? BULL$#!+. Thoroughly debunked. And I lost a ton of money following the load of crap I read. You CANNOT put a 20v engine into a 924 any easier than you can put a Chevy V8 into it!
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Brian near Seattle, WA
'82 Porsche 924

Mark W · Joined: 05 Feb 2006 Posts: 3 Location: Sussex UK

Una,
Would the 931 bellhousing bolt to the back of the block if the flywheel wasn't there? A one-off custom flywheel may cure this bit of the problem.

Mark

bullmoose · Joined: 07 Sep 2007 Posts: 6 Location: The Netherlands

I can confirm that all the difficulties you have pointed out have to be overcome. This is indeed no bolt-on job. Note that I'm doing the install on a 944 with the n.a. 7a engine. From what I have understood from a guy in Russia who has a 20v turbo engine in this 924, you should use a 200 20v flywheel and clutch assembly which apparently fits inside the 931 bellhousing => probably because the 200 20v flywheel is thinner then the 7a flywheel.

This Russian dude has already got the engine, an AAN S4 20v, running as can be seen on the youtube video linked to below. I've emailed back and worth with him a bit but the language barrier is making things a bit difficult.

http://www.youtube.com/watch?v=wNYqz0k_MEo

CBass · Joined: 03 Nov 2002 Posts: 2807 Location: Vancouver, Canada

It's largely a bolt in job depending on which engine you decide to use. Fabricating new motor mounts is not exactly a big deal.

You should see what I'm having to do to get a 968 engine into my car.
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'81 931 in various states of assembly

sokol · Joined: 09 Feb 2006 Posts: 42 Location: Ukraine

moone924 · Joined: 05 Feb 2003 Posts: 868 Location: Douglas Wyoming

too bad I didn't see this thread in time...

The plain Audi 20v i5 is the 7a, which is normally bolted to 01A transaxle.... The Flywheels are much different from the standard tried and true 10v i5, or even the 20v Turbo 3b i5 - They all use the 016 transaxle. The kind of flywheel Una should have been using. Not to mention there are various combinations of engine mounts that might be usable.
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Ryan Moone

Always shopping for a nice s2 931 to baby.
New philosophy : one car project at a time.

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

Martijnus · Joined: 29 Dec 2006 Posts: 2019 Location: Netherlands

All systems gone... prepare for downcount!

http://www.youtube.com/watch?v=1_U05Dgp4q8
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"Rule: Turbo's make torque, and torque makes fun." (C. Bell)

924 "50-jahre", 1981.
MSII/extra, LPG, ITB's, 5lug.
To be turbo'ed in a while.
Killed her at the Nurburgring, Porscheless at the moment