compression

GraveBugger

GraveBugger

New Member
#2
#2
without a gauge? spin the flywheel as hard as you can with the shroud off, if it bounces back a quarter of a turn its all right, with a gauge. screw it in and pull hard on the compression stroke three times, then take reading
 
wayne

wayne

#5
#5
the gauge is free to loan at auto zone, pull the plug get the plug wire out of
the way, get someone to turn it over whyl you hold a finger as close to the
plug hole as you can,like the old days.:smile::smile:
 
F

funky ole

Member
#6
#6
why test compression? too hard to get an accurate reading. use a leak down test, it tells you more than a mechanical gauge ever could.

the most accurate way to test compression is a computerized pressure transducer hooked to an ocilliscope. pricy,but well worth it! you'll need to test with an electric starter for cranking rpm consistancy.
 
Tom S.

Tom S.

#7
#7
I read that if it has the easy spin cam you should spin it backwards to test the compression. That way it comes up on the compression stroke w/o the partial valve lift.
 
oldfatguy

oldfatguy

Active Member
#8
#8
that easy spin feature does nothing but rob power, once I cut that raised part off the cam the engine ran a lot better and idles down lower and smoother. It's best to use a lathe to do it
 
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