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Air cooled engines take up when they are warm ,a compression test is a variable not a dead set test,as a marine engineer we test with the engine running (hot) and generally do it several times and reach average over several tests,it does vary somewhat on each test.
A cold test is helped by turning the engine for a while to blow out any carbon deposits with the plugs out,more important if the motor has been sitting for a while.
Old school mechanics used to squirt oil done the plug holes and then retest ,never done it myself but I assume it would lift the pressures somewhat or provide a better indicator of rings sealing (or not),IMO the OP's test isn't too bad.
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1985 944 2.7 motor,1989 VW Corrado 16v,57 project plastic speedster t4 power,1992 mk3 Golf,2005 a4 b7 qt avant 3.0 tdi,1987 mk2 Golf GTI,1973 914,2.2t to go in.
Past cars, 17 aircooled VW's and lots of BMW's
KP 13/3/1959-21/11/2014 RIP my best friend.
Last edited by porschetub; 08-02-2014 at 12:55 AM..
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