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Forum namePerformance/Engine
Topic subjectCompression Check....
Topic URLhttps://forums.2gnt.com/dcboard.php?az=show_topic&forum=i5&topic_id=70712
70712, Compression Check....
Posted by hunntyr, Mar-15-04 11:30 AM
I was just curious to know about what exact reading I should get with a rebuild on the compression?? I know it would be in the 200's somewhere but I dont know what exact number it should be looking for.
70719, RE: Compression Check....
Posted by KTECLIPSE, Mar-15-04 12:52 PM


Hard to tell without your compression ratio but here are some specs:

Stock Motor (9.6 to 1 CR): 170 - 225 psi (max of 25% difference between cylinders)
Rebuilt Motor (8.6 to 1 CR): around 190 psi

Hope this helps,
Kurt

70764, RE: Compression Check....
Posted by DR1665, Mar-16-04 03:09 AM
I believe with a 10.5:1 CR rebuild, you should see somewhere around 225-240. Not 100% sure since my rings were installed by a moron and my 10.5:1s are netting me some lower stock numbers. :(

Oh yeah. Moron here = me. :P New Total Seals go on with the new head. }(
70766, RE: Compression Check....
Posted by Pyroman415, Mar-16-04 03:18 AM
what happens/what do you do if it is not in those numbers?
70787, RE: Compression Check....
Posted by thedawg, Mar-16-04 06:27 AM
Sue your engine builder.