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Compression Ratio

Ratio is the relationship between two numbers (example: when two gears are compared and one has three times as many teeth, the ratio is 3:1).

Compression Ratio is the amount of compression created by the cylinder. The ratio number compares the volume at the bottom of the stroke and at the top of the stroke. The animation to the right shows a 16:1 ratio (16 is maximum volume and 1 is the minimum).

To calculate the compression ratio, you need the displacement volume and the clearance volume. The following formula is used:

Compression Ratio =

Displacement Volume + Clearance Volume

Clearance Volume




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