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Compression check on a cold motor

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  • #1

    Compression check on a cold motor

    How much difference will it make in the readings if it's a cold compression check?

    Looking at an 800hr boat motor, everything else on the boat looks mint (not restored, just extremely well taken care of).
    Ronald Reagan:"Government's view of the economy could be summed up in a few short phrases: If it moves, tax it. If it keeps moving, regulate it. And if it stops moving, subsidize it."

    Homer: "Bart...there's 2 things I know about women. Never give them nicknames like "jumbo" or "boxcar" and always keep receipts...it makes you look like a business man."
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  • #2
    my suzuki g10 will show ~20lbs difference between being cold and warm.

    i have heard of people using a spray bottle with some oil in it to spray in the plug holes to simulate an oiled engine for compression tests. also dont forget to do the test WOT or i believe you'll get low numbers.

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    • #3
      Spraying oil in the holes will give you a false reading.

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