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  1. #1

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    Prop ?? for you Jerry .

    Running a 2006 RXP with stage 1 less the wedge, plus RR SC wheel , filled holes , vented hull for cooler air.
    Prior to today I was running 8,260 - 8,280 rpm's in cool temps with the 14/19 , air 75/water low to mid 70's.

    Today I installed a 15/20 and I'm turning 8,020 , air 78 water mid to upper 70's , wind was up a bit and light chop.

    What would you do ? Leave it asis , pitch the 15/20 a bit or pitch the 14/19 ?
    I did add 1mm to the 14/19 a while back but saw no change in the rpm's and thought I was to far off so went with the 15/20 but didnt want to loss that much rpm.

    Holeshot had no cavatation at all but seemed a bit weeker than the 14/19 ? No gps or radar today so dont know about speed change.
    Was running high 73's before the prop change.
    The 15/20 felt smoother though if that makes any sence?


  2. #2

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    Jan 2007
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    Big difference between a 14/19 and 15/20. Time for an external IC!

  3. #3
    AKA: Larry lafjax's Avatar
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    Quote Originally Posted by NCRXP View Post
    Running a 2006 RXP with stage 1 less the wedge, plus RR SC wheel , filled holes , vented hull for cooler air.
    Prior to today I was running 8,260 - 8,280 rpm's in cool temps with the 14/19 , air 75/water low to mid 70's.

    Today I installed a 15/20 and I'm turning 8,020 , air 78 water mid to upper 70's , wind was up a bit and light chop.

    What would you do ? Leave it asis , pitch the 15/20 a bit or pitch the 14/19 ?
    I did add 1mm to the 14/19 a while back but saw no change in the rpm's and thought I was to far off so went with the 15/20 but didnt want to loss that much rpm.

    Holeshot had no cavatation at all but seemed a bit weeker than the 14/19 ? No gps or radar today so dont know about speed change.
    Was running high 73's before the prop change.
    The 15/20 felt smoother though if that makes any sence?
    Running the 15/20 at 8020 is good!! 8260-80 is too much on the engine. It will burn up your exhaust manifold soon.

  4. #4

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    Oh yeah, missed that, 8280 Ouch!

  5. #5
    Site Admin Green Hulk's Avatar
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    Quote Originally Posted by lafjax View Post
    Running the 15/20 at 8020 is good!! 8260-80 is too much on the engine. It will burn up your exhaust manifold soon.
    Larry is spot on. You are running against the rev limiter and the ECU is cutting fuel.

    Keep running the 15/20 but remove 1 mm pitch from the trailing edge

  6. #6

    Join Date
    Jun 2006
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    Richmond, Va
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    I think at 8020 you are close to the sweet spot. Sounds like we were both in the same situation. I was hitting 8260 on a 14/19 which like stated will burn your j-pipe/exhaust manifold due to running lean and just installed a 15/20 which I will try tomorrow. I figure even if my RPM's are a little low my next planned mod is a external IC which should get me close if I'm not were I want to be.

  7. #7

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    Quote Originally Posted by Green Hulk View Post
    Larry is spot on. You are running against the rev limiter and the ECU is cutting fuel.

    Keep running the 15/20 but remove 1 mm pitch from the trailing edge
    What bothers me is I think I'm going to lose a few more rpm's once the air and water temps go up in the near future.

    one more thing , after the new 15/20 and new wear ring I had a fair amount of pastic shavings out of the pump on first start up, I could even smell the burning plastic. I've had small amounts before after a new wear ring but not this much. The wear ring was not even tight to the new prop going together.

  8. #8

    Join Date
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    Quote Originally Posted by Green Hulk View Post
    Larry is spot on. You are running against the rev limiter and the ECU is cutting fuel.

    Keep running the 15/20 but remove 1 mm pitch from the trailing edge
    When removing 1 mm are you measuring from the tip or an inch back on the trailing edge? Or is it the same ?

  9. #9
    Quote Originally Posted by NCRXP View Post
    What bothers me is I think I'm going to lose a few more rpm's once the air and water temps go up in the near future.

    one more thing , after the new 15/20 and new wear ring I had a fair amount of pastic shavings out of the pump on first start up, I could even smell the burning plastic. I've had small amounts before after a new wear ring but not this much. The wear ring was not even tight to the new prop going together.
    alignment! Needs aligned!

  10. #10

    Join Date
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    Quote Originally Posted by Muddy River View Post
    alignment! Needs aligned!
    Not a problem , Pulled it out tonight to pitch the prop and had a nice little groove cut into the wear ring , normal. Fact the prop would just barely sneak the wear ring when I spun it in the pump. I guess it was a tighter fit that I first thought when installing it new.

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