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Previous Next Up Topic Public / Dune Buggy Build Advice / cylinder compression testing? (3091 hits)
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.

brad
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
Previous Next Up Topic Public / Dune Buggy Build Advice / cylinder compression testing? (3091 hits)

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