Gear Ratio

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  • March 26, 2020 at 10:05 pm #198544
    labrador-guy
    Participant

      US Member - 2 Years

      OMC guys, does a 10hp 1956 five bolt gear case have the same gear ratio as a 1957 five bolt 18hp gear case? I am using a 10 horse gear case on a 18 and was wondering if I was making a mistake.

      dale

      March 26, 2020 at 10:27 pm #198547
      frankr
      Participant

        US Member - 1 Year (includes $3 online payment fee)

        They are not the same. 15:26 for 10hp, 12:21 for 18hp

        March 27, 2020 at 5:58 am #198559
        billw
        Participant

          US Member - 2 Years

          The ratio is pretty close, at 1.73 for the 15 and 1.75 for the 18. The question in my mind is will the smaller teeth of the 15 stand up to the extra hp?

          Long live American manufacturing!

          March 27, 2020 at 8:02 am #198564
          fleetwin
          Participant

            US Member - 2 Years

            Learned something today….Always thought the gears were the same….

            March 27, 2020 at 10:54 am #198581
            labrador-guy
            Participant

              US Member - 2 Years

              Thanks guys! Probably not worth changing as little as I am gonna run it. I have a 9X11 propeller for it. Another one for sea testing. Wish I lived on a lake somewhere. The right propeller should even things out.

              tks again
              dale

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