24:1 vs 50:1 in 64′ vs 65′ OMC engines

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  • August 28, 2018 at 2:19 am #81919
    johng
    Participant

      US Member - 2 Years

      I have had the Exhaust Covers off quite a few late 40’s & 50’s motors OMC & Mercs. Sometimes the Piston Skirts look real nice and sometimes not to nice and others that are galled severely yet still turn over but would not continue to restore without a rebore and O.S. pistons. Due to the age of the motors I will stay with 16:1 no needle bearings & 24:1 with needle brgs. to protect the investments. I don’t care what the engineers say. Just my thoughts.

      August 31, 2018 at 4:25 pm #82054
      john8504
      Participant

        Different motor but same problem. My Sears motors asking for 32:1 and only my other one is saying 24:1. Would it cause any problems to run 40:1 or 50:1?

        August 31, 2018 at 4:46 pm #82055
        bobw
        Participant

          US Member

          If your motor specs call for 24:1 or 32:1 then you should definitely NOT run 40:1 or 50:1 mixes.

          Bob

          1937 Champion D2C Deluxe Lite Twin
          1954 Johnson CD-11
          1957 Evinrude Fastwin 18
          1958 Johnson QD-19
          1958 Johnson FD-12
          1959 Johnson QD-20

          “Every 20 minute job is only a broken bolt away from a 3-day project.”
          "Every time you remove a broken or seized bolt an angel gets his wings."

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