Quote:
nutcase wrote:
if you are looking to lower the comp big time I would look into getting some z20 pistons and install them on your rods this will lower your comp with the open head to 6.5:1 and 7.5:1 with the closed head. 20 to 25psi is not out of the question with that comp ratio
Absolutely not. Low compression ratio is one goal but other goal is high turbulence wedge combustion chamber. L20B stock pistons are great with closed chamber A87 or W53 head with normal high flow modifications in combustion chamber, in normally aspirated engine problem is to get comp high enough without exensive high dome piston buty with turbo setup comp ratio would be just right 7,5-8:1.
If you had well made high compression head use it with naturally aspirated engine or sell it to somebody but with turbo setup head flow is secondary, good combustion chamber is primary goal and even stock closed-chamber head is superior compared to good flowing head with some 4mm head gasket or Z20 pistons which won't reach deck level.
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