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  1. #1
    Cadet
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    Default Compression Spec on 1993 Evinrude 150HP

    title says it... going to look at a boat with spark issues and was going to check compression it. spark doesnt bother me as long as compression is good. im just wondering what this engine should be running for compression.

  2. #2
    Vice Admiral
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    Default Re: Compression Spec on 1993 Evinrude 150HP

    Over 100 psig and within 10% of each other.
    Jim

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  3. #3
    Moderator JB's Avatar
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    Default Re: Compression Spec on 1993 Evinrude 150HP

    No. The big V6s often measure in the 80-90psi range. The 10% still holds.

  4. #4
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    Default Re: Compression Spec on 1993 Evinrude 150HP

    JB, you are quite right. I just wasn't paying attention! The V6's often read quite low indeed.
    Jim

    ===============================
    I don't respond to Private Messages PM's that are motor questions.

    For basic information on a wide range of topics, see Top Secret File
    Link: http://forums.iboats.com/showthread.php?t=299680

    OEM shop manual: outboardbooks.com or Ebay

  5. #5
    Moderator JB's Avatar
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    Default Re: Compression Spec on 1993 Evinrude 150HP

    Just got a PM questioning if big V6s "should" read 80-90psi.

    There is no "should". There are too many variables. One engine, measured by three different people with different guages and under different conditions will give readings varying by as much as 20-30psi.

    The only real value of compression testing multi-cylinder 2 stroke outboards is to identify single cylinder or adjacent pair failures. All 3, or 4, or 6 cylinders simply do not go bad by the same amount at the same time.

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