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Man, I'm glad you're letting everybody know that a thicker head gasket does not lower the compression ratio. I bet they were getting confused there, thinking that it does lower the compression ratio- because like you said, it doesn't.
Hey,
you're really cool. you didn't bother reading the first post did you?
Er, I can't tell if you're making fun of him for stating that the headgasket won't change the compression ratio, or if you're confused, yourself.
A thicker headgasket = a lower CR. By more than you might think, actually.
Probably the latter.
Learn something new everyday.
IC. I googled it. Thanks for the correction.
Head-Gasket Volume
Head-gasket volume is determined by the compressed thickness of the gasket. A thicker gasket adds volume and reduces compression; a thinner gasket reduces volume and increases compression.
A gasket’s compressed thickness is listed in the manufacturer’s catalog and ranges from 0.051 inch to 0.015 inch. Also, the gasket bore is often larger than the engine bore; a 4.100-inch gasket is common. In our example, we assumed a head gasket with a 4.000-inch bore. Once you know the compressed thickness and gasket bore, here’s how to calculate the volume that the gasket will add to the combustion area:
In our example with a 0.038-inch thickness and 4.000-inch bore, the gasket adds 0.478 ci to the volume of the cylinder. If we used a thinner 0.015-inch gasket and made no other changes, the compression ratio would increase from 8.84:1 to 9.27:1.
Yeah, some guy over on bimmerforums is making 543rwhp on a m52 with only studs and a head gasket
WRONG!
he is making 635rwhp @25psi on 110 octane mad spinage can't hook it up!!!
best trap is 135mph which is good for tens but has only gotten to low-mid 11's because of not being able to hook up.
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