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#5 (permalink)

07-29-2007, 06:04 PM

KevinM

CC Member

Join Date: Feb 2006

Location: Naples, FL

Cobra Make, Engine:

Posts: 183

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Bryan,

It doesn't effect static compression ratio, but it does effect dynamic compression.

It also drastically effects cylinder pressure, and the effect varies throughout the RPM range.

Dynamic compression doesn't take into account the ram effect from the moving column of air in the intake which causes cylinder pressure to vary by different amounts at different RPMs.

Have a look at these for a brief overview:

http://members.uia.net/pkelley2/DynamicCR.html

http://www.kb-silvolite.com/calc.php?action=comp

http://www.hcs.harvard.edu/~jus/0303/kuo.pdf

http://www.vehicular.isy.liu.se/~lar...d_2002_SAE.pdf

Kevin

Last edited by KevinM; 07-29-2007 at 06:31 PM..

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