Subject	compression test - plugs in vs plugs out?
Posted by	evan_aggie on February 12, 2010 at 10:18 PM
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Message	I was wondering if anyone had any documented delta/difference between a compression test with the spark plugs being left in or all being taken out. I know that taking them out will allow the engine to turn over more easily, but I didn't know for sure if it would limit the maximum compression read either. I measured one cylinder and left the rest in. 1st reading was 145-150 psi after the engine was a bit warm. Seems low for a NA, but it does have 130k. I wonder if that number would be any higher with the rest of the plugs removed?
Follow Ups	compression test - plugs in vs plugs out? - evan_aggie 22:18:41 02/12/10 I did it with them all out on my NA and then later - jzack 22:40:06 02/12/10 Thanks for the info! (n/m) - evan_aggie 23:02:43 02/12/10 less than 10psi variation...I saw more from tester to tester - Janders 00:11:11 02/13/10
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