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Engine compression test

Posted: Sun Nov 02, 2008 9:10 pm
by Moph
Just checked compression having done 5000k's on the new rebuild. Readings 1-2-3-4 were 180-180-180-190psi. Results were consistent for 2 separate runs.

Suzuki service manual says "200psi / 400rpm" - is 180/190psi okay? Got no idea how many rpm it's actually doing turning over without firing, but I would suspect its considerably less than 400rpm ... probably more like 250-300rpm.

Compression tester is a cheapo Trisco from Sprints ($40), so not sure how accurate it is either, but at least the relative readings should be correct.

Posted: Mon Nov 03, 2008 5:17 am
by RockHopper
Could be if your compression tester is a cheapo that it's out a little. Could also be that if the readings are correct, the valve clearances may be set just a little to tight causing a loss in compression. Overall though, sounds fine to me. :cool:

Posted: Mon Nov 03, 2008 6:51 am
by lay80n
They sound fine.

Layto....

Posted: Mon Nov 03, 2008 9:12 am
by jonno_racing
yeah thats good
my old motor was

170 180 125 190...

hmmmm