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compression ratio |
Also found in: Dictionary/thesaurus, Acronyms, Wikipedia | 0.02 sec. |
compression ratioDegree to which the fuel mixture in an internal-combustion engine is compressed before ignition. It is defined as the volume of the combustion chamber with the piston farthest out divided by the volume with the piston in the full-compression position (see piston and cylinder). A compression ratio of six means that the action of the piston compresses the mixture to one-sixth its original volume. A high ratio promotes efficiency but may cause engine knock. The measurement of compressed data. For example, a file compressed into 1/4th of its original size can be expressed as 4:1, 25%, 75% or 2 bits per byte. See archive program and data compression. |
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| In order to lighten the circuitry, the compression ratio was limited to one-third (1/3), and a differential pulse code modulation (DPCM)(*2) scheme featuring simple structures was adopted. 3:1 compression ratio, rev limit of 6,700 rpm, and produces 71. This reduces the compression ratio and allows for good degassing. |
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compression ratio
