First post for me, so if we get flamed...blame it one me. :)vallely said:My CLYMER manual says the compression ratio is (7.1:1). Does this mean that it is 7.1 bar to 1 bar or 7.1 atmospheres to 1 atmopshere of pressure. If it does then that would make the psi inside the cylinder at around 100-110 psi on a good engine.
I put the compression tester on my bike and kicked it at WOT and The readings were right around 110 or a little above 110 psi. Does this mean that my engine is properly sealing for comprssion?
-Rob
SHSPVR said: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
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