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head gasket
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AppleBit  



Joined: 16 Nov 2002
Posts: 1516
Location: Minneapolis, MN

PostPosted: Thu Feb 21, 2002 11:30 am    Post subject: Reply with quote

When you put a thinner head gasket on an the 924 NA, that advances or retards timing?

I am looking at putting on the Porsche 924 Turbo headgasket on my car.... this is why I ask....


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Porsche 924 Wide Body LS1 Corvette 500 Horsepower Engine
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Alex Roy  
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PostPosted: Thu Feb 21, 2002 1:13 pm    Post subject: Reply with quote

Well, from looking at it, it retards it.
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AppleBit  



Joined: 16 Nov 2002
Posts: 1516
Location: Minneapolis, MN

PostPosted: Fri Feb 22, 2002 3:52 pm    Post subject: Reply with quote

I am wondering the thickness difference, if it really increases a 1/2 point and how much it will change the cam timing...

again, doesn't matter since I have vario cam timing... but curious ya know

- Jon
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Benski  
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PostPosted: Sat Feb 23, 2002 4:45 am    Post subject: Reply with quote

I did the calculations once. I can't remember but it wasn't quite 0.5 compression points. It was more like 0.1 or 0.2. Not worth the effort IMO but maybe worthwhile if you have to replace the headgasket anyway.
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TroyDest  
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PostPosted: Thu Mar 07, 2002 8:44 am    Post subject: Reply with quote

Hey Jon,

I just took apart an '81 931 engine. The original head gasket (Victor Reinz) measures 0.064 inches. How thick is your 924 gasket? By the way, the cheapest 931 gasket I've found so far is $150!!

-Troy
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-nick  
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PostPosted: Thu Mar 07, 2002 9:41 am    Post subject: Reply with quote

woah! you're looking in the wrong places. i picked mine up for about $30 at my somewhat local shop- gicp.com in MA. it was also a reinz i believe.

-nick
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AppleBit  



Joined: 16 Nov 2002
Posts: 1516
Location: Minneapolis, MN

PostPosted: Fri Mar 08, 2002 12:13 am    Post subject: Reply with quote

I'll check on the NA thickness...

I picked up just the head gasket from Auto Atlanta for just under $50....

Should be in today....
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TroyDest  
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PostPosted: Sat Mar 16, 2002 6:30 am    Post subject: Reply with quote

Well Jon,

Did you get your head gasket? Who is the manufacturer, what is the part number on the gasket, and how thick is it? By the way, how thick was your NA gasket? Thanks, Troy
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eturbo924  
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PostPosted: Sat Mar 16, 2002 7:30 am    Post subject: Reply with quote

Bob Dodd down on the 931 list sells a complete head gasket kit for that cost
Right about $50.... complete kit. I purchased it and it is the best I have seen. He also send it over night when I needed it real quick. great service and price and he is a 924.org lister!

Eric
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Zuffen  



Joined: 31 Jul 2001
Posts: 1421
Location: Owasso, Oklahoma 74055

PostPosted: Tue Mar 19, 2002 6:45 am    Post subject: Reply with quote

The gasket set I sell is for the 924NA....I can't recall what the difference is but the ports are sized and placed different. Which could all be modified I quess should one want to.

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931 1982, 944 1982 euro, 924S 1988SE, 93 968 tip 06 Silver Cayenne S, 06 Black Cayenne S

I have Way too many cars, parts for the 931,944 and 951
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AppleBit  



Joined: 16 Nov 2002
Posts: 1516
Location: Minneapolis, MN

PostPosted: Tue Mar 19, 2002 7:01 am    Post subject: Reply with quote

Are you sure the gasket ports are located elsewhere? I heard you could do a few modifications to a 924 Turbo head and just bolt it right onto the NA block (yeah, I know the pistons would need to be higher compression...but...)

I hope this gasket works... dont want to spend more than I need to right now....
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Zuffen  



Joined: 31 Jul 2001
Posts: 1421
Location: Owasso, Oklahoma 74055

PostPosted: Tue Mar 19, 2002 9:22 am    Post subject: Reply with quote

To clarify

the water ports are what is different between the two gaskets.

The blocks are identical and the head I believe is real close. There are some water passages on the 924NA and not on the 931. I think the holes are smaller on the 931 gasket. I guess Ineed to compare and take pictures . I've got a GTR gasket a 931 gasket and a 924 gasket. I don't have each brand of 924 or 931 gasket made. And there will be differences.

What are you needing Apple bit, which car?

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Bob Dodd - 924turbo@cox.net
931 1982, 944 1982 euro, 924S 1988SE, 93 968 tip 06 Silver Cayenne S, 06 Black Cayenne S

I have Way too many cars, parts for the 931,944 and 951
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AppleBit  



Joined: 16 Nov 2002
Posts: 1516
Location: Minneapolis, MN

PostPosted: Wed Mar 20, 2002 12:18 am    Post subject: Reply with quote

I heard you can put a 931 gasket on the 924 NA and since it is thinner, you can raise the compression then..........
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-nick  
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PostPosted: Wed Mar 20, 2002 2:59 am    Post subject: Reply with quote

some of the water jackets are a little different between the 931 and 924na gaskets.

from what i've found the difference is actually a desireable one for the na. the change is water jacket hole sizes and placements is to keep the head temperatures more consistent from one end to the other. the difference is probably only noticeable in longevity.

as for the thickness- a few thousands is not going to change your crank/cam timing anymore than expansion/contraction from temperature changes on the 3ft. of rubber timing belt will change the timing.

i'll get around to a compression test on mine eventually and hopefully end the debate on whether the compression goes up with the 931 gasket. stock 9.3:1 compression is supposed to read 156psi i belive. so anything above that on my practically new motor will be due to the 931 headgasket. regardless of compression, the 931 gasket will offer better longevity on the na engine due to the water jacket changes.

regards,
-nick
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AppleBit  



Joined: 16 Nov 2002
Posts: 1516
Location: Minneapolis, MN

PostPosted: Wed Mar 20, 2002 3:08 am    Post subject: Reply with quote

I think that a 8.5:1 compression engine can read 160 psi sometimes, and other times it can read 120 psi... the reason it is different is cam timing... so, that test will say nothing...
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