Automotive Dictionary: Compression

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Automotive Dictionary: Compression


Throughout this site we use many technical terms, and given the breadth of readership our site enjoys, sometimes we are remiss and incorrectly assume everyone knows what we are referring to. For those that do not, here are some explanations of the technical terms use.
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Compression


The pressure existing in an engine's cylinder when the piston is at the top of its stroke with both valves closed. At cranking speeds, the compression in an average car's engine is in the region of 9 bar (130 psi).
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