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  1. #1

    Opinions Needed. Need RPM without cash....ha

    I have all the mods in my sig and I am still having trouble turning the 13/18 160mm impeller. I am around 7800rpm and I want to be ~8400. Accel is good with no cavitation but lacking on the top end.

    Looking for a cheap way to get to where I need to be..

    Questions:
    1.) Is bending below a 13/18 counter productive?
    2.) would it be easier to go back to the 155mm housing?


  2. #2
    hitman's Avatar
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    Quote Originally Posted by allstar71 View Post
    2.) would it be easier to go back to the 155mm housing?
    Yes.

    Or upgrade to a C5 wheel and an R3 tune.

  3. #3
    Just relax and enjoy the ride. XLT Chad's Avatar
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    Mabey a little larger nozzle? Just a thought.

  4. #4
    Addicted Member 5001craig's Avatar
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    Great thread David.

    For whatever it's worth, I was told by Glenn at Skat that he could pitch a Skat prop to whatever I wanted.

    I will know what I can turn my Skat 13/19 160mm Longblade after this weekend.

  5. #5
    I got some info that may be useful. Said that going back to a 155mm pump would be a big step backwards and gave me two things to do before I repitch my impeller. After doing both of these things then work on the impeller some more.

    1.) Increase my nozzle to 86mm.
    2.) Increase my steering nozzle to 91mm. (use a flapper wheel and drill)

  6. #6
    Bounty Hunter Carlos Thomas's Avatar
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    I have the E1 - MoTeC - 160 mm Skat 12 Vane Pump. I needed to go to 12/20 pitch to get the boat were I wanted it.

  7. #7
    305coco's Avatar
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    Quote Originally Posted by Carlos Thomas View Post
    I have the E1 - MoTeC - 160 mm Skat 12 Vane Pump. I needed to go to 12/20 pitch to get the boat were I wanted it.

    using what size nozzle?

  8. #8
    Kristian Keppel Waterholics's Avatar
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    Quote Originally Posted by allstar71 View Post
    I have all the mods in my sig and I am still having trouble turning the 13/18 160mm impeller. I am around 7800rpm and I want to be ~8400. Accel is good with no cavitation but lacking on the top end.

    Looking for a cheap way to get to where I need to be..

    Questions:
    1.) Is bending below a 13/18 counter productive?
    2.) would it be easier to go back to the 155mm housing?
    A little off topic but what speeds are you doing at this RPM ?

  9. #9
    mjh3ides's Avatar
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    Quote Originally Posted by allstar71 View Post
    I got some info that may be useful. Said that going back to a 155mm pump would be a big step backwards and gave me two things to do before I repitch my impeller. After doing both of these things then work on the impeller some more.

    1.) Increase my nozzle to 86mm.
    2.) Increase my steering nozzle to 91mm. (use a flapper wheel and drill)
    If you don't have an adjustable nozzle, I'd recommend buying a used 87mm GPR nozzle from the classifieds & just drill & tap it for the reverse brackets(it already has the bosses). You'll want to go 92mm on the steering nozzle with that size reduction nozzle. It's gonna take a long time to remove that much material with a flapper wheel & IMO it'll be real hard to get it true. A local machine shop can bore it for you faitly cheap. A buddy of mine did one for me on a 3-axis lathe & it's perfect. Also, consider taking some pitch out of the leading edge depending on where your revs are with the bigger nozzle. I'm guessing 13 is a little much for the B1, even with the bigger nozzle.

  10. #10
    Just relax and enjoy the ride. XLT Chad's Avatar
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    If your interested in a gpr nozzle, I have a new one with the reverse bosses tapped already and vis. spout removed. Was going to use it on my XLT but didnt make it that far. PM me for a price if you need it.

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