Gear Ratio

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  • labrador-guy
    labrador-guy

    US Member - 2 Years
    Replies: 305
    Topics: 34
    #198544

    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

    frankr
    frankr

    US Member - 1 Year
    Replies: 4821
    Topics: 48
    #198547

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

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    billw

    US Member - 2 Years
    Replies: 1117
    Topics: 38
    #198559

    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!

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    fleetwin

    US Member - 2 Years
    Replies: 2936
    Topics: 38
    #198564

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

    labrador-guy
    labrador-guy

    US Member - 2 Years
    Replies: 305
    Topics: 34
    #198581

    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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