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Prop info

Discussion in 'Owners Chat: Options and Upgrades' started by Richard Wing, Jul 8, 2019.

  1. Richard Wing

    Richard Wing Member

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    I am new to boating I currently have a 2016 Bennington ssrx with a 90 Yamaha.
    The Max RPM I get is between 4200 and 4300.
    From what I researched I'm supposed to be between 5500 and 5800 RPMs. The prop I have on the motor is a 13.25 X 17. I have called two different dealers and found the ballpark but 13 and 5/8 X 14 or a 14 X 14. My question to y'all would I increase speed or would this make my boat go slower going down in prop size.
    FYI max speed for my boat is 20 miles an hour.
     
  2. Vikingstaff

    Vikingstaff Well-Known Member

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    Looks like you are way over proped with a 17p on the 90 Yamaha. I don’t even have that size on my motor (200hp) Your motor is working too hard to turn it, and that’s why you are so low on RPM’s. That is not good on your motor at all, so you need to go down in prop/pitch to do right by that motor. Frankly, I think you will pick up a little bit of speed because your motor would be spinning the new right sized prop better.

    I think you will still be too large with a 14p, but I am not familiar with those sized motors either. My guess would be more of an 11-13p. Hopefully some others with a 90HP can chime in with their prop size for comparison purposes.
     
    Michiman and Richard Wing like this.
  3. Richard Wing

    Richard Wing Member

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    That would be beneficial for me if somebody else can chime in on their 90 horsepower just so I can do a general comparison
     
  4. jmoreland

    jmoreland Well-Known Member

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    What size is your boat? I have a 2575 with a Yamaha F100 and run a 4 blade 13 pitch solas. My boat is big and heavy but I can hit 23mph on GPS with me, my 11 year old son and a full tank of gas.
     
  5. Richard Wing

    Richard Wing Member

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    Mine's a 20-foot
     
  6. Allan56

    Allan56 Active Member

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  7. Allan56

    Allan56 Active Member

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    13P / 4 prop
     
  8. Richard Wing

    Richard Wing Member

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    What ptch prop?
     
  9. 2fast4u

    2fast4u Well-Known Member

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    Location:
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    you need a 11 or 13 pitch prop at best my Yamaha 115hp uses a 13 Pitch at 6000 rpms. you are way over propped. when u get the rpms up you will be amazed how much better your boat does.
     
  10. Richard Wing

    Richard Wing Member

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    I have a 14 inch prop coming Wednesday as soon as I get it I'll put it on take it for a drive and I'll let y'all know what happens. that's far thank you very much to everybody that has made a comment
     
  11. 2fast4u

    2fast4u Well-Known Member

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    regardless of what prop you wind up with you must be able to turn close to 5800 to 6000 rpms, my bet is you will wind up with a 13 5/8 dia. prop with a 11 or 12 pitch to get the desired rpms and good performance out of your boat, of course all testing has to be done with clean pontoons also.
     
    Vikingstaff likes this.
  12. Richard Wing

    Richard Wing Member

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    I have a 13 5/8 by 14 coming
     
  13. jmoreland

    jmoreland Well-Known Member

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    I tried 5 different ones on mine before I settled. When I bought the boat, it had a 17 pitch and I could only turn 5000 rpms.
     
    Vikingstaff likes this.
  14. Richard Wing

    Richard Wing Member

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    I have installed the new prop 13 5/8 X 14. My 20ft ssrx now goes 6100rpms at 26.3 mph. The old prop was a 13.25 X 17 and the max RPMs was 4300 at 20 mph. thank you all for the information has been very helpful hopefully one day I can reciprocate
     
  15. rodsfields

    rodsfields Well-Known Member

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    Location:
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    That’s fantastic! Congratulations!
     
  16. Vikingstaff

    Vikingstaff Well-Known Member

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    Awesome news! Congratulations. I am glad your work and inquiries have payed off, and you are seeing positive results. Hope you enjoy some great times on that “newly performing” boat.
     

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