Cometic HG Compression Drop/Increase??

darvo

E30 Addict

Join Date: Dec 2010

Posts: 407
#1

Cometic HG Compression Drop/Increase??

06-14-2013, 09:46 AM

How much of a compression drop/increase would a cometic head gasket make if??

Stock HG .080" 8.8:1
Cometic .040" ?????
Cometic .140" ?????
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digger

R3V Elite

Join Date: Nov 2005

Posts: 5856
#2

06-14-2013, 05:18 PM

Originally posted by darvo View Post

How much of a compression drop/increase would a cometic head gasket make if??

Stock HG .080" 8.8:1
Cometic .040" ?????
Cometic .140" ?????

by my quick calcs

9.75:1 with 0.040"
7.71:1 with 0.140"

assuming 85mm bore on the gasket which is approx what stock one is

89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...

new build thread http://www.r3vlimited.com/board/showthread.php?t=317505
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