Formula
The ratio is calculated by the following formula:
- , where
- = cylinder bore (diameter)
- = piston stroke length
- = clearance volume. It is the volume of the combustion chamber (including head gasket). This is the minimum volume of the space at the end of the compression stroke, i.e. when the piston reaches top dead center (TDC). Because of the complex shape of this space, it is usually measured directly rather than calculated.
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