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  1. #1
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    lacombe la
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    Exclamation merc Lower unit gear ratio

    I currently have a 3 liter 1.75 ratio lower unit on a light 19 foot
    bass boat( about 1100 lbs) I am swinging a 25 pitch yamaha v max prop
    at 6000. If I get a 1.62 lower unit will I be able to swing a bigger
    prop. I have a 29 yamaha t1 that I would like to put on it or maybe
    even more pitch in the future. I am thinking about getting a lower unit
    from sterndrive becuase mine is leaking oil everywhere and I didn't
    know if I should get the 1.62
    Thanks

  2. #2
    Join Date
    Aug 2007
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    Ft. Lauderdale, Fl
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    No, the lower you go with the ratio number, the closer you get to 1:1, if you drop from a 1.75 to a 1.62, you will need less pitch to stay at 6000
    "One of the penalties for refusing to participate in politics is that you end up being governed by your inferiors". Plato .

  3. #3
    Join Date
    Aug 2009
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    chico
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    i am not an expert but if you change it 1.62 ratio and your engine have the power to reach the same RPM you will gain more speed.

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