Do I need to change my prop???
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Do I need to change my prop???

  1. #1
    Junior Member RIVER22's Avatar
    Join Date
    Jun 2010
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    Upland Ca
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    9

    Default Do I need to change my prop???

    I am running a 496 HO with CMI Sport Tube headers... I had them installed early summer. I am running a Bravo SS 24 P Prop. RPM when trimmed just right is running at 5000 RPM. I didnt notice a big difference in power ... maybe 1-2 MPH if conditions are just right. My question is, should I change my prop to a 26 or 28 P...

    Any feed back please...

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  3. #2
    Junior Member
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    Feb 2009
    Location
    Houston
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    138

    Default

    Unless the diameter or number of blades are decreased, you'll find that the RPM's at WOT will decrease if pitch is increased. Without knowing more information about your engine, I'll have to assume that your engine can't handle much more than 5k RPM's.

    If your engine can safely turn 5500 RPM's or even 6k, you would be better off by reducing the pitch or the diameter of the propeller.

    What is the gear ratio in your drive? Without calculating the slip, the efficiency of your current setup can't be determined, and the best option to get the most of the setup is just a guess.

    I'm not anywhere as knowledgable as some of the other guys on here, but I've been in the boating industry for a while and what I wrote above are general truths. Someone with more experience about your boat might be along later.

    You can also try posting in the outdrive section.

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