This technique is suited to someone who is in the middle of putting an engine together and has the right tools, or someone whose engine is already in pieces. We're looking at the first of these ways here. Firstly, you can make a math calculation as accurately as possible, or secondly - the more popular method - uses an empty spark plug socket with a pressure gauge inserted. There are two ways of calculating the compression ratio for an engine. Compression ratio is the ratio of cylinder volume at bottom dead centre to cylinder volume at top dead centre, or (swept volume + combustion chamber volume) to. The compression ratio is the ratio between two elements: the gas volume in the cylinder with the piston at its highest point (top dead center of the stroke, TDC), and the gas volume with the piston at its lowest point (bottom dead center of the stroke, BDC). Compression Calculator Simply fill in the form below to calculate your compression ratio Bore: (diameter) in. The compression ratio of an engine is a very important element in engine performance. How to use this calculator: Simply fill in all the boxes below with the requested figures and click on "Calculate CR" to find your engine's compression ratio. This compression ratio calculator can be used to work out the compression ratio of your engine.
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