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Old 08-30-2014, 02:10 PM
easyrider47 easyrider47 is offline
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239 ci egine compression check results...problems

just had a compression check done on my 239 ci flathead v8..............

........7 of the cylinders were in the 75 to 85 range, while the remaining cylinder tested less than 50................??

......secondly, the mechanic left all the plugs in while removing only the plug of the cylinder being tested......could this have affected results ?


thanks
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Old 08-30-2014, 02:30 PM
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drptop70ss drptop70ss is offline
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I would rerun the test with all the plugs removed, also supposed to have the throttle wide open while cranking as well.
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Old 08-30-2014, 03:27 PM
easyrider47 easyrider47 is offline
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...............if all plugs removed....engine obviously will not be starting..............so what difference does it make having the throttle wide open on an old engine like this ?

..........thanks
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Old 08-30-2014, 03:42 PM
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all plugs out is for maximum cranking speed

throttle open is for max air into the engine

Nothing to do with not starting. Ignition should be disabled during the test, remove the coil wire.
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Old 08-30-2014, 04:16 PM
easyrider47 easyrider47 is offline
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the light just went on in the closet !!!.............thank you.............

I admittedly know little, but am eager to learn............really one the primary reasons I bought an old "simple" truck..............

......what a great resource this forum has turned out to be !

thanks again................I am sure I will be posting more questions..............
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Old 08-30-2014, 04:18 PM
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raytasch raytasch is offline
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Originally Posted by easyrider47 View Post
the light just went on in the closet !!!.............thank you.............

I admittedly know little, but am eager to learn............really one the primary reasons I bought an old "simple" truck..............

......what a great resource this forum has turned out to be !

thanks again................I am sure I will be posting more questions..............
Good questions usually result in correct answers.
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Old 08-30-2014, 04:18 PM
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