how to determine static/dynamic compression ratios?

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Dec 15, 2005 | 07:51 AM

LostCauseZ06

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From: Ogden, Utah

how to determine static/dynamic compression ratios?

ok... i have tried calculators on the net.. and they are all telling me my compression is going to be insanely high.. (ive got to be doing something wrong..)

engine is a 408, heads are 64 CC, i will be using cometic .041 gaskets, and my pistons in the 408 have an 8cc dish. how do i figure out the damn compression ratio?? anybody know roughly where ill be??

Dec 15, 2005 | 09:05 AM

DrkPhx

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From: St. Michael, MN.

You didn't mention the deck height (how much the piston is in or out of the hole) which is critical when calculating static compression. The calculator listed below is considered very accurate because it correctly factors this into the equation.

http://www.rbracing-rsr.com/compstaticcalc.html

Here's a couple for dynamic compression.

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

http://www.rbracing-rsr.com/comprAdvHD.htm

Check out the Advanced Performance Tech forum here. There are a couple threads about all of these topics.