Pelican Parts Forums - Compression Test

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Compression Test

I just had a compression test done and was wondering what you thought of the results
Compression in fireing order is: (1,6,2,4,3,5)185:190:190:190:185:185.

Michael

It doesn't get much better than that!

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Warren Hall
1973 911S Targa
1992 Dodge Dakota 5.2 4X4 parts hauler

Those numbers sound excellent!

I always heard that 145 or so is considered good, with less than a 10% variance from the average.

What would be considered unacceptable, or something that would cause the engine to run noticeably weak? In other words, what really warrants a top end tear down for further investigation? Is 120 suspect, if the other numbers are 140ish? What about 100? 90? etc...

I'll be doing my first compression check this week, and would like to get some thoughts on what to expect.

Thanks,

JA