It changes. Compression ratio is dependent on stroke, piston diamiter , and piston design. Long stroke compresses more volume of air, bigger pistons compress more volume (air) and if the piston top is shaped to fill the entire combustion chamber the compression ratio increases. If you are trying to resolve engine issues, compare compression PSI in each cylinder. If each cylinder varys it is due to piston ring leakage, or valve leakage or a leaky head gasket.
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Today's Featured Article - It Can't Be Done! - A Tractor Story - by Neil Campbell. I'll never forget the time back when I was a boy baling hay on our Farm in Big Rapid, Michigan. The most memorable event that took place was a trip up the steepest incline on the farm pulling an old New-Idea baler with a pony-motor for power and a haywagon. I had just talked my Dad into buying an old John Deere B with 6-speeds ahead and I was real proud of it, except it was a little smaller than the Case tractor that we normally
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