Engine compression
Road Captain
Joined: May 2008
Posts: 516
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From: New Hampster!
leak down won't tell you what your ccp is just tell you how much leakage you have..
To do a proper ccp you need a fully charged battery, remove the aircleaner hold the Throttle wide open (on carb hold the slide up) ground both plugs and turn it over until the guage stops climbing.
To do a proper ccp you need a fully charged battery, remove the aircleaner hold the Throttle wide open (on carb hold the slide up) ground both plugs and turn it over until the guage stops climbing.
Outstanding HDF Member
Joined: Feb 2009
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From: ID Ho
Leak down is only half of the tests, you must do both leak down and compression. HOT to get an acurrate measure!
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Joined: Feb 2006
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From: Eastern Washington
OK. I am out voted here. I always thought that a leak down test was a better way to determine if the rings were going bad...along with valves and seals. But I am not an expert. So how about compression test, and if you get low reading then leak down? But if you got readings within range then no need for leak down?
Last edited by PistonPuller; Feb 3, 2010 at 04:03 PM.
Outstanding HDF Member
Joined: Feb 2009
Posts: 2,005
Likes: 53
From: ID Ho
OK. I am out voted here. I always thought that a leak down test was a better way to determine if the rings were going bad...along with valves and seals. But I am not an expert. So how about compression test, and if you get low reading then leak down? But if you got readings within range then no need for leak down?
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