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  1. #1
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    Quick question about prop pitch and gear ratio

    One of my boats is a 20 Ft. Sea Ox with a console and T-top. I have a 2.5 liter Merc 200 on it that runs very strong. I have a quick question about prop pitch and gear ratio.

    In terms of efficiency - both in terms of gas mileage and speed, would I be better off running a 21 pitch with a 1.875 gear ratio or say a 23 pitch on a 2.0 gear ratio lower?

    What I'm asking is - for this boat in particular and in general - would a faster spinning lower pitch prop be more or less efficient than a slower spinning higher pitch prop? Would one get better mileage and the other get better cruising and top speed?

    Appreciate your experiences and advice.

    Steve2ManyBoats.

  2. #2
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    Edgewater,B.C. CANADA
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    You probably won't notice any real change in speed or mileage, might accelerate slightly better.

    Dave
    1980 Cougar 19 tunnel,90 2.4L Bridgeport EFI in middle of restoration.
    1988 BAJA Sunsport 186, 96 225 Pro Max
    79 12' Auminum, 95 Merc 9.9
    RIP Stu
    "So many idiots, so few bullets"

  3. #3
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    In lower prop speed applications, it's a wash. When you're turning 8 or 9k + rpm is when it starts to matter based on hydrodynamics. In your application, experiment with props and run the one that works best for ya
    1990 Shadow bass boat w/ 2.4 200 Merc. Totally resto'd boat and love it!

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