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wc motor ? and compresson

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al schooley

04-03-2011 07:28:37

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have wc block with wd45 crank wc pistons and rods did a compresson test and had 140 on #1 had 130 on #3 had 20 on #2 and 125 on #4. Why does compresson get worse and is this a valve or a ring problem. what should my compresson be on this motor

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04-03-2011 12:00:55

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 Re: wc motor ? and compresson in reply to al schooley, 04-03-2011 07:28:37  
back all the valves off and hook a air hose into the cylinder that had 20 lbs it will either blow the air into the oil pan ,out the carb or exhaust . into oilpan means rings to tha carb intake valve to the exhaust exhaust valve.

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Al Schooley

04-03-2011 10:14:22

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 Re: wc motor ? and compresson in reply to al schooley, 04-03-2011 07:28:37  
i thought 125 to 150 would be low on this motor for compresson with 45 crank and wc pistons and rods.What kind of compresson does a stock wc engine have then?

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04-03-2011 07:58:32

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 Re: wc motor ? and compresson in reply to al schooley, 04-03-2011 07:28:37  
It could be either a ring problem or valve problem. Have you tried a wet compression test? Put a few squirks of oil in the cylinder and recheck compression, if you get a higher reading then it is a ring problem if it stays the same then it is a valve problem. To check which valve is leaking put air in the cylinder and slowly turn the engine over and listen at the intake and exhaust and find out which one or both are leaking. Did you run this engine long enough for everything to seat properly? A good compression range for this engine should be 125-150 psi.

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04-03-2011 07:48:46

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 Re: wc motor ? and compresson in reply to al schooley, 04-03-2011 07:28:37  
Squirt some motor oil in a cylinder and teat again. If the results don"t get alot better it"s probably a valve or head gasket problem.

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04-03-2011 09:00:41

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 Re: wc motor ? and compresson in reply to Jim350, 04-03-2011 07:48:46  
I would really think you might have problems with the valves.
Not very often the rings will wear that far off between all the cylinders to cause the readings you are getting.
If a ring broke in one cylinder that would be one thing but to have 2 bad cylinders at the same time is another thing.

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04-03-2011 09:02:34

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 Re: wc motor ? and compresson in reply to Jim350, 04-03-2011 09:00:41  
Sorry I misread a reading. I thought I read # 4 at 25.

With one bad cylinder I would still check for a valve problem first.

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