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The compression ratio is the ratio of the volume of the cylinder and the combustion chamber when the piston is at the bottom, and the volume of the combustion chamber when the piston is at the top. Automotive engineers can improve fuel efficiency and fuel economy by designing engines with high compression ratios.
Using these psia pressures from the examples above, a 10:1 compression ratio is calculated. 200 psia = 10:1. 20 psia. 10:1 is a compression ratio commonly found in refrigeration applications. In this example, the suction pressure drops by 10 psia, which doubles the compression ratio. At this compression ratio, a compressor designed for a 10:1 ratio would have a tough time surviving.