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Old 03-12-2002, 10:18 AM
Arthur Dalton Arthur Dalton is offline
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Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,784
A compression test can certainly be done without opening
the intake air, but in a test you want the HIGHEST possible reading to test the components [ rings,valves, etc.]
So restricting the intake air passage on any gas engine
may give an inaccurate reading.
At cranking speed, there May be enough intake air to get a good reading, but open intake [ throttle/choke/etc.] assures there is.

Common tech pratice .
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