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Compression Testing (short!:) (archive)
[ Follow Ups ] [ 7-series (E23) Message Board ] [ Msg. Board FAQ ]
Posted by randy735i325i on January 26, 2002 at 16:51:33:

In Reply to: 80psi on all cylinders but one at 75 is this ok? posted by mikec on January 25, 2002 at 23:37:14:

Mike,

Tell me how you performed the compression test
please. Your numbers show that you maybe stopped
too early - like 2 or 3 "hits" of the needle.
Industry standard (and that's a loose term:) is
5-6 "hits", all plugs removed, throttle open,
engine warm, battery charger on, ignition/fuel
disabled. The second compression "hit" should
be 60-70% of the total - showing good piston
ring seal. Specs for your engine are: 142-156 psi
at the above conditions.

Regards,
Randy

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