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  1. #1
    CRAZEDRXP's Avatar
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    Proper Compression ??? 04 Rxp

    Just did a quick test ... engine cold 115/110/115


  2. #2
    Quote Originally Posted by CRAZEDRXP View Post
    Just did a quick test ... engine cold 115/110/115
    You're supposed to do it after the engine has run for awhile or at least warmed up so it's at normal operating temperatures.

    I have the same question as you though. I'm going to be checking my compression this weekend and would like to know what it should be for each cylinder.

  3. #3
    Moderator The Bandit's Avatar
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    Hot, cold, different guages, you can end up with a lot of different numbers. I think 130's is typical for a hot engine, but KEY is all three being in the same ballpark, which yours are Crazed.

  4. #4
    CRAZEDRXP's Avatar
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    I actually typed the wrong #s ..135 125 130 are the real #s

  5. #5
    As long as they are within 10% of each other they're fine.

  6. #6
    Red Devil's Avatar
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    On a cold engine, usually one of the cylinders are off like yours. From the looks of it, your compression will be within 5 when warmed up.

  7. #7
    Site Admin Green Hulk's Avatar
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    Quote Originally Posted by CRAZEDRXP View Post
    I actually typed the wrong #s ..135 125 130 are the real #s
    Those are good numbers

  8. #8
    Rendog's Avatar
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    Quote Originally Posted by Red Devil View Post
    On a cold engine, usually one of the cylinders are off like yours.
    Why is this?

  9. #9
    Quote Originally Posted by Rendog View Post
    Why is this?
    From what I understand the center cylinder gets most of the abuse bc it`s heat transfer is less with cylinders on both sides. I don`t know if BRP has different clearances for bore and ring end gaps to compensate for this. The end cylinders have more coolant/heat transfer area.
    I have done a compression test on my GTX SC as well, a while back when the engine was cold and came up with similar results:
    132-125-132 approx...
    I was also informed to slightly warm the engine by running for just a half minute or so. You don`t want to remove spark plugs from a HOT alum head...PR...

  10. #10
    Rendog's Avatar
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    Well, I basically come up with readings of 145/125/145. I added a little oil to the middle cylinder and it brought it up to 150, the engine was COLD! Im going to run it on the hose and check it again!
    Last edited by Rendog; 06-30-2007 at 10:45 AM. Reason: bad spelling

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