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Old 07-18-2019, 10:20 PM   #1
Vanspeed
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Default Can anybody help with a comp. ratio?

I have a head that measures 120cc. From what I have calculated it is around 7.5:1. Stock A engine.
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Old 07-19-2019, 04:27 AM   #2
Bruce of MN
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Default Re: Can anybody help with a comp. ratio?

What volume of the piston is above the deck? I think that has to be deducted from the 120cc.
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Old 07-19-2019, 07:32 AM   #3
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Default Re: Can anybody help with a comp. ratio?

Buy Jim Brierly's book.
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Old 07-19-2019, 09:51 AM   #4
Dick Steinkamp
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Default Re: Can anybody help with a comp. ratio?

You will need these measurements in order to calculate CR...

http://www.csgnetwork.com/compcalc.html
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