Thread: Compr ratio from a compr test?
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03-11-2007 07:37 PM #2
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- Mar 2005
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- Williams, Oregon
- Car Year, Make, Model: 1946 Ford 1/2 ton
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Cranking pressure
Denny W, would you take a look at this cranking pressure calculator. I am missing something. I plug in numbers for my soon to be assembled motor, as follows: 9.1 CR, cam 260, stroke 3.3, rod length 6.32, alt. 300 m, and it comes back with a cranking pressure of 189 psi.
Originally Posted by DennyW
Yes you can, your buddy is wrong. Simple, if it's over 150 lbs, use the premium fuel. Around 110-120, it's only about 8-8.5 to 1. About 175-180 is 10.7-11.3 to one, with a picked cam. With a straight up 3/4 race cam, it's over 11.5.
http://not2fast.wryday.com/turbo/com...pressure.shtmlLast edited by 46yblock; 03-11-2007 at 07:42 PM.
305 ci Y-block in 46 1/2 ton
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