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General compression test ?

Discussion in '40- & 55-Series Tech' started by Blue60, Mar 18, 2003.

  1. Blue60

    Blue60

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    Hi All,

    Another question for the experienced mechanics out there...

    What difference would you expect to see when doing a compression check on a "cold" engine versus an engine that has been warmed up?

    Higher or lower values?

    I did a compression check on my 2F engine during a recent tune and registered average values of about 155 across all the cylinders. This was done on a room temperature engine.

    Any thoughts? :-/ :-/

    Dave
     
  2. Degnol

    Degnol

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    Sounds like you're good on all 6. Normally I take out all the sparkplugs, prop the throttle open, choke open and give it a spin. I'd think the readings would only go up when things are warm. Even if the readings were numerically lower, be happy they're all close to the same.
    GL :)
     
  3. wayne_fj40

    wayne_fj40

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    my theory,if they are all within 5 pounds of each other compression is not the prob,start looking for others but if that is what it is let me know Ill remember that