[Public-List] atomic 4 compression test

John Boor mahseer at kos.net
Sat Dec 1 10:36:58 PST 2012

100-110 is quiet normal as long as they are even on each cylinder.

John boor

> We are currently rebuilding an old Atomic 4 and trying to determine a
> baseline for compression. We were testing the engine when it was cold,
> using a battery, and got results in the 100-110 range. Adding oil
> increased compression to 115-125ish. The plugs are fouling very quickly in
> regular useage (black soot, not oily) and the engine is running rough at
> times with significant vibration. It has been suggested that it needs a
> ring and/or valve job. But the compression seems to be in the specified
> range.
> Any thoughts would be much appreciated.
> Mark Bisset
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