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Compression Test-Cold vs Hot? 120-130

posted by  Rhys on  Tue Sep 16 11:39 CST 2008
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last visit: Tue Nov 20 10:22 CST 2012
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Unless the engine has been run very recently, there is no accuracy to a compression test. Overnight cold is fine, run briefly is fine, hot is fine, but if it has sat for any length of time, forget it.
Variation, not the specific number, is what is important.
It is a highly over-rated measurement, and one I use for diagnosis of a problem, rather than a maintenance or condition check. I just listen to the engine running, and can tell far more.





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New Compression Test-Cold vs Hot? [120-130]
posted by  malloy1  on Tue Sep 16 10:19 CST 2008 >


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