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What should the cranking compression be?

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What should the cranking compression be?

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Old

Nov 14, 2009 | 09:52 AM

#1

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From: Minnesota Corn Fields

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What should the cranking compression be?

Motor is a 402 with TrickFlow 225's 61cc, 10cc dish pistons, about 11:1 compression, VRX5 cam (236/238 601/605 113) and a Fast 92

Its only reading at about 145-150psi cranking compression right now.

What is it suppose to be?

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Nov 14, 2009 | 10:20 AM

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From: Port Tobacco, MD

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Higher than that. My old corvette was 220s with the big cam/high compression and I think 205-210 with the 11.0:1 setup.

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Nov 14, 2009 | 10:40 AM

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I never saw more than 170psi on my 11:1 402

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Nov 14, 2009 | 01:18 PM

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From: Michigan

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I wouldnt worry about the number, as long as they are all within the same range.

Are you down on power? Whats the problem other than its not the cranking compression you thought you should have?

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Nov 15, 2009 | 09:33 AM

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From: Minnesota Corn Fields

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yeah its low on power, only making about 470-480rwhp in a CTSV

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Nov 15, 2009 | 08:37 PM

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That compression is low. Should be in the 170-180 range. Leak it down and repost the numbers. TOM

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145, 210, 47, 52, compression, comprssion, corvette, crankin, cranking, ls1, ls2, mod, motor, performance, pontiac

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