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Thread: Prop ?? for you Jerry .
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05-07-2008, 06:33 PM #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?
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05-07-2008, 06:52 PM #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!
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05-07-2008, 07:44 PM #3
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05-07-2008, 08:16 PM #4
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Oh yeah, missed that, 8280
Ouch!
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05-07-2008, 08:40 PM #5
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05-07-2008, 08:41 PM #6
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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.
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05-07-2008, 09:14 PM #7
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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.
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05-09-2008, 11:02 PM #8
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05-09-2008, 11:14 PM #9
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05-09-2008, 11:22 PM #10
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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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