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Old 05-29-2006, 19:28   #1 (permalink)
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Question Compression ratio estimate from measured PSI

I know that these types of tests are only a guide and vary depending on cam intake timing. Just after a rough guestimate, of what you fellas with 11.5:1 are getting and with what intake timing.

I was getting roughly 190psi with 230@050 intake lobe
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Old 05-29-2006, 20:00   #2 (permalink)
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Re: Compression ratio estimate from measured PSI

You can't really get an idea... Mate's roller Clevo had 11.34:1 with a 270@0.050" Crane, and it had 100psi cranking pressure.
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Old 05-29-2006, 21:18   #3 (permalink)
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Re: Compression ratio estimate from measured PSI

Your right about that, especially with that bigger cam duration difference.

I was hoping there was someone around with about the same intake duration as mine.
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Old 05-31-2006, 04:36   #4 (permalink)
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Re: Compression ratio estimate from measured PSI

see if this helps
http://not2fast.wryday.com/turbo/com...pressure.shtml
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Old 06-01-2006, 05:21   #5 (permalink)
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Re: Compression ratio estimate from measured PSI

cheers,
Thanks for that info.
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