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Compression Interpretation
I was wondering something...why is it that the compression readings seem to climb with each crank of the motor? If the exhaust valves are opening and releasing all pressure, I would have thought the compression reading would always be the same.
Example...readings on my 7.3L showed average 220/310/410 on the first 3 strokes. Another member commented that this was a decent reading.
Does it have something to do with the rings "seating" themselves or sealing up?
BTW, I understand the basics...2 side by side low readings usually indicates a bad head gasket, consistant low pressure may indicate worn valves etc. But the original question kind of stumps me...how do you differentiate between worn rings and what I was showing?
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91 F350 7.3L ZF-5 Speed 4.10 New Project Truck and lots to learn!
Also Own:
95 Freightliner FL70 5.9L Cummins (inframed at home) 6 speed Fuller, 11R22.5, 4:10, 4" exhaust and stack with a teeny weeny muffler [img]/ubbthreads/images/graemlins/smile.gif[/img], 14,000lb Stellar Hooklift for lifting waste containers
81 F350 351M C6 4.10 14 Yard Dump Body and 6mpg!
98 Dodge Cummins 5.9L-12V 5 Speed 4.10 LS 3500 Dually 4x4, 420,000 on odo, Chelsea PTO pump, 12K winch, 14 yard Dump Body, worn out shift knob and driver seat, no silencer, Boost, Pyro, no muffler, gutted kitty, lots of mud.
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