Ohhh mannnnnnn, messed up some math I think.... - Miata Turbo Forum - Boost cars, acquire cats.

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Old 08-17-2011, 05:18 PM   #1
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Default Ohhh mannnnnnn, messed up some math I think....

So the factory gasket needed to be replaced aswell as the head being cut/
Cylinder head was cut .030"
To compensate for that I ordered a .075 gasket from Cometic,(stock gasket measured around .02x".... did a compression test today, 125 across the board, My questions is would .045" drop the compression that much?(this gasket was thicckkkkkkkk) Turboing it anyhow, but just wanted to make sure
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Old 08-17-2011, 05:37 PM   #2
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well that was stupid
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Old 08-17-2011, 05:48 PM   #3
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You didn't remove a cylindrical area from the combustion chamber, now did you? Decking the block would have netted you the correct chamber volume with a thick gasket, but the chamber isn't cylinder shaped.
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Old 08-17-2011, 05:55 PM   #4
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You're messing with the quench area. Running a thicker or double head gasket is usually a hack to gain lower compression.
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