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compression ratio

noun, Automotive.
the ratio of the cylinder volume enclosed by the piston at its outermost position to the volume enclosed by it at its innermost position.
Origin of compression ratio
1905-10 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for compression ratio
  • Mazda's mad scientists say they spent a decade studying high compression ratio powerplants.
  • If engines were designed to burn ethanol instead of gasoline, they could use a higher compression ratio.
  • Calculate problems using the formula for compression ratio.
  • Some higher compression ratio heavy-duty lean burn engines include an additional feedback for knock detection.
  • The actual amount of loss depends upon the compression ratio selected.
  • The results were used to determine fuel selection, compression ratio, and other overall system parameters.
British Dictionary definitions for compression ratio

compression ratio

the ratio of the volume enclosed by the cylinder of an internal-combustion engine at the beginning of the compression stroke to the volume enclosed at the end of it
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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