What is the compression pressure of a gasoline engine?

1 Answers
VonMalia
07/30/25 8:19am
The compression pressure of a gasoline engine is between 9 and 12 bar. Typically, engines with low compression ratios are below 10 bar, while those with high compression ratios exceed 10 bar. Older gasoline engines have compression pressures ranging from 6 to 10 bar. The compression ratio of a gasoline engine refers to the degree to which the engine's air-fuel mixture is compressed, which is the ratio of the total cylinder volume before compression to the cylinder volume after compression. The volume formed by the engine piston moving from the lowest position to the highest position represents the smallest volume during the entire piston stroke. The compression ratio to be calculated is the ratio of the maximum stroke volume to the minimum volume.
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