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Compression Test- Hot vs Cold
#637287
03/12/10 02:42 AM
03/12/10 02:42 AM
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Joined: Jun 2006
Posts: 5,159 CT
GTX MATT
OP
master
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OP
master
Joined: Jun 2006
Posts: 5,159
CT
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The Factory Service manual lists that cranking compression on a 440 should be 110-150 with the engine warm. I have headers and my plugs aren't too hard to get out and in, but with the headers hot (which they will be while the engine is warm) its impossible not to burn my hands or arms, even if I wear gloves. I tested mine just for giggles, and got 125-130 on all cylinders, how much higher do you think it would be hot?
Now I need to pin those needles, got to feel that heat Hear my motor screamin while I'm tearin up the street
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Re: Compression Test- Hot vs Cold
[Re: Kern Dog]
#637289
03/12/10 08:48 AM
03/12/10 08:48 AM
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Joined: Feb 2003
Posts: 12,675 Columbia, CT
moper
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 12,675
Columbia, CT
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Did you pull all the plugs for the cold test? A hint... you can remove spark plugs with a 13/16 box end wrench too, and/or pull the two motor mount to K frame bolts and jack the engine up a little to help access to the plugs. The engine will stay warm for the few minutes that takes. If you changed the cam the pressure recommendations from the FSM are not valid any way. I'd expect with things hot and all the plugs out it would pump 10-15% higher depending on the quality of the ring seal.
Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.
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Re: Compression Test- Hot vs Cold
[Re: Kern Dog]
#637291
03/13/10 02:25 AM
03/13/10 02:25 AM
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Joined: Dec 2009
Posts: 580 PA
Moparzrule
mopar
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mopar
Joined: Dec 2009
Posts: 580
PA
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Just a note, prop the carb wide open so you get plenty of air while cranking, it does make a difference.
My Own Personal Adrenaline Rush
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