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compression test results......

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Old May 29, 2006 | 05:12 PM
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Default compression test results......

all clynders are between 175- 180 psi.i'm wondering what the formula is to turn the results into a ratio?
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Old May 29, 2006 | 05:22 PM
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Normally 175-180 psi is around 10-1...that is a very rough ball park figure.
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Old May 29, 2006 | 07:48 PM
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The psi cranking pressures could be used to give an approximate dynamic compression and then with cam specs you could calculate approx static compression in theory.
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Old May 29, 2006 | 08:09 PM
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Originally Posted by ajrothm
Normally 175-180 psi is around 10-1...that is a very rough ball park figure.
Too many variables to have a formula for a calculation.
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Old May 30, 2006 | 07:42 AM
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Originally Posted by ajrothm
Normally 175-180 psi is around 10-1...that is a very rough ball park figure.
My 72 base 350 has 168-175 psi on compression.....I know it's not a 10 to 1 compression...runs on 87 octane in the FL heat with no knocking or pinging !!! Cranking compression is a variable of cam timing. This car has stock or close to stock cam specs.

Last edited by mbeeman350; May 31, 2006 at 07:48 AM.
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