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  1. #1

    Compression Numbers

    I did a search on Compression numbers but really didn't find what I was looking for so I'll ask this basic question here...

    This would be on a Stock engine, or mildly modded with Thru-Hull Exhaust and Free-Flow Intake if that would make any difference.

    4-Tec 215h.p. S/C'd Engine: ???

    4-Tec N/A'd Engine: ???

    Checked warm or cold ?

    Other 2 plugs removed or does it matter ?


    Thanx in advance for your input(s)
    David


  2. #2
    CHAD IBADTON's Avatar
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    Would like to know also. My #s are 100-98-102 I think thats low?

  3. #3
    Mine cold were 150 for all three

  4. #4
    Moderator beerdart's Avatar
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    I just did mine stock engine 56 hours.

    Warm engine
    Throttle wide open
    All spark plugs removed.

    140 across the board.

    Next I did a leak down test and it was 6% across the board.

  5. #5
    Moderator RX951's Avatar
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    stock motor
    throttle wide open
    60 hours on motor
    Left other two plugs in and remove one at a time for testing
    warm engine
    142/143/145

  6. #6
    Are these numbers all for the Supercharged 215 engine ?

    Is it best to check compression on the 4-Tec Cold or Warm ?

  7. #7
    Moderator beerdart's Avatar
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    Yes supercharged
    Yes warm

  8. #8
    CHAD IBADTON's Avatar
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    How could all three be so low? maybe my gauge is bad

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    Quote Originally Posted by IBADTON View Post
    Would like to know also. My #s are 100-98-102 I thank thats low?
    Depends on cam timing,temperature of the engine. Do you have blowby?

    It is possible your ok depending on...

  10. #10
    CHAD IBADTON's Avatar
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    Took compression 2 hr after running still warm with 2 plugs in never touched timing Ski runs good

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