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Gas and Pitch

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  • Gas and Pitch

    I just change my propellers from 23 to 21 pitch. What is the impact of that change in gas consumption?

  • #2
    Depends on what your boat and motor were doing before the changes. A lower pitch on a prop will usually give you more "power" (for a better hole shot) but less miles per gallon. You also could run into a motor that is now over reving (over the manfactures WOT) as you didn't say what you WOT was before this change.

    1973 22 CC Milford, CT USA[br]


    • #3
      Above is correct. 23P sounds pretty damn high, usually only see those kind of pitches on bass boats, unless of course you're hanging mucho HP.

      I dropped 2" in pitch on our 261 to get RPMs up a bit, went from stock s/s yam wheels to 17p Stiletto's. Speed remained pretty much the same across the board except top end where I actually gained. My burn ended up dropping a hair across the board as the engines weren't working as hard to turn the wheels.
      1990 261 T/2001 200 HPDIs[br]Basking Ridge/Mantoloking NJ[br]


      • #4
        What is the diameter of the 17P Stilettos? Were the stock Yams 13.75Inches?
        Al Caletri[br]1987 26\' Mako CC[br]Narragansett, RI


        • #5
          I try the pitch 21 today. I get the boat to 5000 rpms and reach 49 mph. I will know about gas consumption when I fill it tomorow. Is the motor more gas eficient in high or low speds?

          Mako 251, 1989 with twin 225.