924Board.org

Pascal924 · Joined: 24 Dec 2014 Posts: 29 Location: Vlissingen

Hello,

I have a badly damaged cilnderhead.
I need to shave around 0.65 mm, but is already at his minimum wear limit.

Is this possible?
Will valves hit the pistons?
What wil be THE cr? It is a 1979 931. I expert +0.5??

Thanks

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

It is possible, particularly with the use of Cometic Multi-Layer Steel gaskets, you can make up the difference.

Standard gasket thickness was .049";
.045" + .065" = .110";

So you could use a .098" ($136) thickness gasket or a .120" ($224) thickness gasket to be pretty close to OEM spec without too much concern regarding interference or increase in compression ratio.

http://garage.ideola.com/prod-EngineRebuildKits.html#Cometic

You may still require a Vernier pulley (adjustable cam sprocket) in order to get the timing dialed in correctly, especially if you opt for the .098" gasket, because the head + gasket combination will still be outside of the wear limit.
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erstwhile owner of just about every 924 variant ever made

Pascal924 · Joined: 24 Dec 2014 Posts: 29 Location: Vlissingen

Thanks,

I think you calculate in inches, i calculate in mm...
I Will made a conversion.
Greetings

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

Pascal924 · Joined: 24 Dec 2014 Posts: 29 Location: Vlissingen

Thanks,

I Will shave the head and than see what i need.

Do they deliver to europ? Netherlands?

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

peterld · Posted: Mon Dec 28, 2015 6:05 pm Post subject:

Nice one Dan...another Toofah saved!
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80/81 932/8 ROW

Pascal924 · Joined: 24 Dec 2014 Posts: 29 Location: Vlissingen

I went to an revision company, and they day that it was to bad.
The head needs to be welded and than shaved.
It was already 0.5mm under the min wear limit, and i need to shave at least an other 0.6mm.

This is too much. You could see already in the sparkplug hole that the head was shaved.

It will be relative costly....

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

Sorry to hear the bad news

One of our forum members, Kenodog, has several used heads available for sale, send him a PM. It would probably be cheaper to have one shipped to you unless you can find one locally.
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erstwhile owner of just about every 924 variant ever made

Pascal924 · Joined: 24 Dec 2014 Posts: 29 Location: Vlissingen

Well, i can find a good head...and it is just to build a spare engine.
I Will keep the head, Some day, it Will be worth to repair it.
The crankcase and block is fine.
Have 4 good pistons, so with a new set of rings the engine is worth to rebuild.

It is difficult to find good parts.
I also have a turbo...with a cracked exhausthaus....hopefuly i can find a good one.
I aso have a k26 8.10 gts turbo, but i think it is to big for a standaard engine.?

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

Carrera RSR · Joined: 08 Jan 2010 Posts: 2312 Location: Somerset, UK

WEASEL149 · Joined: 19 Aug 2005 Posts: 595 Location: UK, Sheffield

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

Is it this one??

K26-2670GA/8.10
5326-988-7008

If so would't this be worth much more than just a bigger turbo, for collector value, or to restore an original GTS?
It being a real GTS turbocharger and all, if it is, I don't think I would just run it on some modded 931..

Any way you could post pics of this thing and the tag numbers for my curiosity?
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80 Turbo - Slightly Modified

WEASEL149 · Joined: 19 Aug 2005 Posts: 595 Location: UK, Sheffield