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 - Adding an Hour Meter - by Steven Gussey. This article tells how I added an electric hour meter to my 1942 Farmall H after rebuilding it. I wanted to keep an accurate maintenance schedule for my rebuilt engine and the implements I use with my tractor, but the H was never available with a tach
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