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B20E combustion chamber volumes 140-160 1971

posted by  jparker3 on  Thu Oct 9 15:24 CST 2008
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last visit: Tue Jun 9 18:47 CST 2009
[RELATED]

The original question related to the difference unequal chamber volumes have on static compression ratio.

Might I suggest that since the volume used for the computation of static compression ratio includes the volume of the deck height - the height of the piston above or below the deck of the block at top dead center - unless you add that volume to the actual combustion chamber volume, you don't know whether there is any actual difference in static compression ratio between cylinders or what that difference is.

Might I also suggest that engines never actually see static compression ratios.
What they do see is actual or operating compression pressures or ratios. The biggest difference in actual, operating compression between cylinders is the flow of the ports. Unless port flow is equal, the compression pressure based on the actual volume compressed in each cylinder will not be.

John
V-performance.com






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