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the compression ratio is a single number that can be used to predict the performance of any engine (such as an internal-combustion engine or a stirling engine). it is a ratio between the volume of a combustion chamber and cylinder, when the piston is at the bottom of its stroke and the volume when the piston is at the top of its stroke. the higher the compression ratio, the more mechanical energy an engine can squeeze from its air-fuel mixture. higher compression ratios, however, also make detonation more likely.
the compression ratio is a single number that can be used to predict the performance of any engine (such as an internal-combustion engine or a stirling engine). it is a ratio between the volume of a combustion chamber and cylinder, when the piston is at the bottom of its stroke and the volume when the piston is at the top of its stroke. the higher the compression ratio, the more mechanical energy an engine can squeeze from its air-fuel mixture. higher compression ratios, however, also make detonation more likely.