copper headgaskets and performance HG's - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 04-02-2006, 09:24 PM
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copper headgaskets and performance HG's

can someone educate me the subject. from what little ive learned ive kinda read here and there.


the first few things about copper gaskets ive learned was this.. just today haha

1. Conductivity. Copper is the standard by which all other conductors are measured, therefore a copper gasket provides superior thermal conductivity, acting to stabilize head and block temperatures which makes tuning easier.

2. 25% coefficient of elasticity. One of the properties of copper is that it stretches before a catastrophic failure, thereby providing an extra measure of safety in case of severe detonation.

3. Strength. Copper (in the form we use) has a tensile strength of approximately 32,000 psi, compare this to the 1,200 to 1800 psi tensile of most facing materials used on conventional performance head gaskets.


secondly they come in different sizes, 0.72" being stock for us M50 and S50 type motors. i assume that the thicker the gasket the lower the compression will be. can you tell me why?

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#2 (permalink) Old 04-02-2006, 10:30 PM
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I havent heard anything about copper head gaskets, but I use copper in my Chevelle, for both the header and collector gaskets. The reason I went with them is I kept blowing out the paper, fiberglass, and whatever else is available. My next ones were going to be aluminum if the coppers didnt work. The copper ones have yet to blow out, running about 7 years now. I'm not sure about headgaskets, but I'm sure they are doing the same thing for similar reasons (strength, longetivity, ability to re-use [unless they are some sort of crush-type]). *shrugs*



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#3 (permalink) Old 04-02-2006, 11:03 PM
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well i know that cooper is suppose to be a good step for FI cars, i was just curious for the sake of curiousity. my friend had done this to his civic, but recently he said he went back to stock because the copper one was dangerous or something to that affect

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#4 (permalink) Old 04-03-2006, 08:32 PM
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Quote:
Originally Posted by Furious
well i know that cooper is suppose to be a good step for FI cars, i was just curious for the sake of curiousity. my friend had done this to his civic, but recently he said he went back to stock because the copper one was dangerous or something to that affect
i never heard of it being dangerous, but i think copper gaskets would mostly be better for F/I apllications as said above, i have seen them perform very well in my old Galant vr4 and also a couple of friends DSM's. They do very good in handling heat, but more important keeps your head intact.
But yea thicker gaskets do lower compressions.It gives a bigger gap on your head, thus for more boost applications or for whatever power addon you wish to apply.

Hope this helps.
http://www.headgasket.com/faq.html

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#5 (permalink) Old 04-04-2006, 05:47 PM
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I use copper headgaskets for many apps. import and domestic. These guys are easy to deal with too.
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#6 (permalink) Old 04-05-2006, 01:09 AM
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Stock is 0.071, not 0.72.

Coppy HG are used because they are good heat conducters. The thciker the gasket, the increased space there is between the head and the block, which causes compression ratio to drop.

Going with a thicker gasket would result in a drop in power. Since you're goign with as ueprcharger it's probably even harder to gauge what psi and CR combination would provide the best results. Do you know what psi you're goign to start with?


Also, while you're doing the HG you should upgrade your studs to ARP or Raceware. I've heard some rumrs that goign with a HG as thick as 0.141 might even require longer studs. Some peopel ahev said against this though. Not sure what to say there.


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#7 (permalink) Old 04-05-2006, 01:31 AM
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superchargers should just stay stock thinkness though right? unless i raise boost? which i probably wont without doing some sort of fuel riser and getting a different pully

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#8 (permalink) Old 04-05-2006, 01:34 AM
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Well if you stay at low boost then you dont need to increase thickness. Putting in a thicker headgasket on low boost wouldnt be advantageous for power. Once you turn up the boost then you should defintely look into it. I barely see s/c guys doing anythign more than studs adn a HG when they get into higher boost because of the inefficiency at high boost levels.


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#9 (permalink) Old 04-06-2006, 09:10 PM
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I would think that studs would be really for the additional vertical pressure presented to them via the extra power by your ubercharger. I am referencing my Chevelle again just becasue I've had it for 16 years. My rod bolts were actually stretched beyond their tolerences and I had to go to a stronger bolt when putting the motor back in. Just curious....



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#10 (permalink) Old 04-07-2006, 01:21 PM
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Quote:
Originally Posted by da_bull
I would think that studs would be really for the additional vertical pressure presented to them via the extra power by your ubercharger. I am referencing my Chevelle again just becasue I've had it for 16 years. My rod bolts were actually stretched beyond their tolerences and I had to go to a stronger bolt when putting the motor back in. Just curious....
Yes sir. Stronger studs would keep the head on more reliably.


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#11 (permalink) Old 04-16-2006, 11:52 PM
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copper gaskets + experimental turbos = blown motor.

the headgasket is your measure of safety against poor tuning.
you've been warned.

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