Compression ratio w/cometic head gasket - 600RR.net
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post #1 of 3 (permalink) Old 08-24-2019, 07:48 AM Thread Starter
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Compression ratio w/cometic head gasket

Hello, does anybody know what the thinner Cometic .018" head gasket will bring the compression ratio up to, on an 03?

LRRS / CCS #811
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post #2 of 3 (permalink) Old 08-24-2019, 10:12 PM
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18 thousandths of an inch will would change it slightly but the quench area is already so tight you may ping really bad, better gains out of 1mm oversized valves and port and polish with cam upgraded springs and a full dyno tune on fuel map and timing map.

chris cook
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post #3 of 3 (permalink) Old 08-27-2019, 02:45 PM Thread Starter
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It's only nine thousandths closer. Obviously I will be switching to premium fuel to avoid knock. I know some bikes (zx6rr) ran as high as 13.9 to 1 on pump gas, and the 600rr only has 12 to 1. I've read the quench clearance will be brought down to about .070" which seems to be acceptable. I will be adding an epoxy ported head on it, at the same time.

LRRS / CCS #811
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