dynamic compression help

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Jul 29, 2014 | 10:31 PM

SStressin

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From: Long Island

dynamic compression help

so im trying to figure out my dynamic compression ratio. my numbers on the cam card is all in .050. is there a conversion to get it to advertised so i can use the calculator? if anyone can help me its a ls1 383. 11.2 to 1 static, cam specs are 240/256 .647/.647 111lsa. im at sea level. also ABDC is 48 at .050. i came up with 9.94 to 1 with using that which i know is wrong.

Jul 30, 2014 | 05:33 AM

RezinTexas

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From: Katy, TX

there is no conversion that will be accurate for every cam. You need to know the numbers at 0.006" valve lift for your specific grind, contact the manufacturer.

Jul 31, 2014 | 01:42 AM

99Bluz28

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From: C. V., Kalifornia

This is only a rough guess since the duration @ .006" valve lift aren't known.

DCR 8.19, if the ramp rate of the lobes are 55
and...
DCR 8.38, if the ramp rate of the lobes are 50

So your DCR is roughly any where from 8.19 - 8.38 .