By Nick R 2948 Date 2012-09-26 15:58
I have a stock 1500 with single port heads. I want to do a compression test on the cylinders. My old Harley with 100,000 miles and 9.5:1 compression ratio is putting out 165psi in each cylinder. What should I expect to see on my stock 1967 motor? What is considered a good range of values? I am getting a little bit of smoke out of the 3/4 bank and I want to check compression before I tear things down. Thanks!
By Jeffrey P 655 Date 2012-09-26 16:17
This might be one of those "a$$holes" questions...and what I mean is everyone is gonna have one (answer).
My thoughts would be between 80-120psi. Balance between the cylinders is more important than the actual psi.
By Brad H 1498 Date 2012-09-26 17:30
Anything less than 100psi means you have troubles. Make sure your valves are adjusted before you test and hold the throttle open while cranking.
By Nick R 2948 Date 2012-09-27 00:36
thanks for the input! You guys have helped me lots with gettin' my buggy running right. Glad I found this website, you guys rock!
By Funnybug Date 2012-09-27 11:52
stock '67 had 7.5:1 compression if I remember correctly
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