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Message: [QUOTE="SHSPVR, post: 1117608, member: 73255"] photomd your close it more like Cylinder Bore Size Piston Stroke Length Head Gasket Bore Diameter & Compressed Head Gasket Thickness Combustion Chamber Volume In CCs Piston Dome Volume In CCs Negative Piston Deck Clearance Negative If ABOVE Deck 2 stroke motor have to be done like this CR = ( 1 + 2 ) / 2 CR is compression ratio 1 is cylinder volume at exhaust closing 2 is combustion chamber volume vallely compression ratio has very little to do with psi pressure compression ratio = mechanical energy an engine that can squeeze its air-fuel mixture. Your rings play the key role in both psi pressure & compression ratio also 2 stroke don't have some type compression ratio as 4 stroke becuases of the Open Port and short squeeze time for its air-fuel mixture. And ask me I belive the 110 psi it is about rigth for properly sealing on compression ratio of 7.1 [/QUOTE]