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copper headgasket info

 
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-nick  
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PostPosted: Sat Apr 13, 2002 2:37 am    Post subject: Reply with quote

hi all,
i threatened to post a pic of the copper gasket i used which shows how the compression leaked out:



you can see the lines from the cylinders to the outer edge where the compression pushed out.

this was a .050" thick gasket. if the stock NA is .067" and the rule of thumb is .1 compression points for every .005" then i was running ~9.6:1 with euro pistons.

as you can see, you must o-ring the block even with this little amount of compression on a copper gasket. i didn't think i would need to worry about it until the compression approached 11+, but there are just not enough headbolts to hold it in without an o-ringed head.

just an fyi, i thought it was an interesting pic. someday i'll pull the engine back out for a refresh and have it o-ringed.

-nick

[ This Message was edited by: -nick on 2002-04-13 01:39 ]
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AznDrgn  
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PostPosted: Sat Apr 13, 2002 3:32 am    Post subject: Reply with quote

What exactly is having the head O-ringed?
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-nick  
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PostPosted: Sat Apr 13, 2002 7:02 am    Post subject: Reply with quote

you cut a groove in the head around the circumfrence of the cylinder and insert a bead of metal in the block. so when you mate them there is a lock around each cylinder to hold the compression in.

it's not an expensive process but requires giving the machine shop your head (not such a big deal) and your block (a pita!).

this can be done vice-versa, with the groove in the block etc.

after this process you will never have another headgasket problem. some are hesistant and say that the headgasket is a safety valve keeping pistons and valves from being damaged. i've never heard of anyone having a problem on a well setup engine, it's when you start to skimp that things go wrong.

-nick
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AznDrgn  
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PostPosted: Sat Apr 13, 2002 9:36 am    Post subject: Reply with quote

Hmm sounds like a pretty good idea. Are there any advantages to which side you do it on? Will this help for turbo charging applications when you keep the stock 8.5:1 compression?
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AznDrgn  
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PostPosted: Sat Apr 13, 2002 9:37 am    Post subject: Reply with quote

Oh yeah and approximantly how much is it?
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-nick  
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PostPosted: Sun Apr 14, 2002 4:41 am    Post subject: Reply with quote

i'm not sure if there is an advantage one way or another. give any auto machine shop a call, they're usually pretty interested when you start talking about things like this to them. as for price? i can't really remember what i was quoted, i'm thinking it was under $100 for all four cylinders.'

it works great for any cars that have problems with headgaskets. turbos especially.

-nick
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AppleBit  



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

PostPosted: Sun Apr 14, 2002 5:03 am    Post subject: Reply with quote

I had the same exact problem with my copper head gasket. I am going back to the original head gasket. Less mess.

Mine lost compression as well as dripped anti-sneeze

For Sale: One copper head gasket

- Jon McCullough
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Cbass  
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PostPosted: Sun Apr 14, 2002 11:57 am    Post subject: Reply with quote

I'll buy that for a dollar!

I'd want the groove to be in the block, as theres more room to work with there.
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Richard  
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PostPosted: Mon Apr 15, 2002 11:09 am    Post subject: Reply with quote

Just a quick question. Did you guys use any gasket cement? I thought copper head gaskets were suppose to be sealed with NAPA Hi tack sealer or GM gasket compound or equivalent.
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-nick  
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PostPosted: Tue Apr 16, 2002 10:33 am    Post subject: Reply with quote

you can use any hylomar sealer. i talked to the manufacturer of mine and he concurred that the motor would not hold in the compression with o-ringing. a flathead ford with a gizillion headbolts yes, 924's with just 8 can't hold it in.

-nick
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AznDrgn  
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PostPosted: Tue Apr 16, 2002 10:46 am    Post subject: Reply with quote

So there is really no point in doing it for our cars?
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-nick  
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PostPosted: Tue Apr 16, 2002 11:06 am    Post subject: Reply with quote

sorry, the post should have said "would not hold the compression in withOUT o-ringing". if you're running high compression or lots of boost it's worth it.

-nick
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924 turbo  
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PostPosted: Tue Apr 16, 2002 3:44 pm    Post subject: Reply with quote

Quote:
a flathead ford with a gizillion headbolts yes, 924's with just 8 can't hold it in.


I think I figured out your problem! You forgot to put in two of the headbolts!
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-nick  
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PostPosted: Wed Apr 17, 2002 6:06 am    Post subject: Reply with quote

aha! sorry, that should be 10 headbolts. this massachusetts heat wave is really going to my head.

-nick
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Vince Ponz  
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PostPosted: Wed Apr 17, 2002 9:55 am    Post subject: Reply with quote

I have a Eruo 85 block with 9.3 pistons if anyone is interested.

I am in NYC area
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