Wouldn't you be able to calculate compression ratio by pulling two rockers off a cylinder, attaching a fitting to the spark plug hole, filling it with fluid at BDC, rotating to TDC while capturing the expelled fluid .. then
Total fluid at BDC - amount of fluid expelled at TDC = volume of combustion chamber.
(Amount of fluid at BDC + volume of combustion chamber) divided by volume of combustion chamber = compression ratio ??
Basically just CC'ing the whole cylinder as a working unit.
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