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  1. #1
    PWCToday Regular watersled's Avatar
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    Jul 2013
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    Dawsonville, GA
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    Re-pitching an impeller

    I'm currently running a swirl 12/17 but I don't think I am getting the RPM's and speed out of my ski. My set up is:

    62t/61x
    dual 38's jetted 135 main, 70 pilot, stock needle and seat, stock spring
    Factory limited pipe
    rear waterbox and rear outlet
    Flow control valve
    dual cooling
    MSD enhancer

    With this setup I was only pulling 6550 RPM and 48-49 MPH. I'd like to just re-pitch the impeller I have but what would I want to pitch it to for racing? Also, feel free to critique my current set up as well. Thanks!
    Last edited by watersled; 03-17-2016 at 10:13 AM.
    Sport Stock and Sport GP #346
    -IPD Graphics -Lucas Oil
    -Riva Racing -Jet Dynamics
    -Extreem Throttle -Jettrim

  2. #2

    Re: Re-pitching an impeller

    is jetting spot on? how fresh are your rings? whats your squish band at and whats your compression? thats a low RPM for having a pipe on it.

    PM scotty mac or he will probably see it here soon enough.
    1994 1100 SJ - Dead
    1996 spec hx
    "I'm going to be installing the hooker on my driveshaft in the next two weeks." -Element3488

  3. #3
    PWCToday.com Is My Home Away From Home Wet Wolf's Avatar
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    Re: Re-pitching an impeller

    Yeah, somethings wrong, It should be able to spin that prop to the sky with no problem.


    Bruce Wolford (509) 280-5444 - Pump Performance
    http://www.wetwolf.com

  4. #4
    PWCToday.com Is My Home Away From Home Rod Peters's Avatar
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    Re: Re-pitching an impeller

    Contact Impros, I am sure they can help you out www impros.com/store or 515 N Smith Ave Ste 102, Corona, CA 92880 (951) 737-2900
    

  5. #5
    PWCToday.com Is My Home Away From Home tshank123's Avatar
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    Re: Re-pitching an impeller

    49 seems kinda high for such low RPM. Im wondering if your pitch is too high, or higher than you think.
    FN Wealth Management - http://www.fnwealth.net/
    High Speed Industries - TBA
    RIVA Motorsports - http://rivaracing.com/
    Competitive Crankshafts - http://competitivecrankshafts.com/

  6. #6
    PWCToday Regular watersled's Avatar
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    Re: Re-pitching an impeller

    It's supposedly a 12/17 but never checked it myself. As far as the jetting goes, it's close, I've only messed with it for about an hour on the water but if I turned in the main, the RPM would fall off. If I turned it out the RPM wouldn't reach over 6500.
    Sport Stock and Sport GP #346
    -IPD Graphics -Lucas Oil
    -Riva Racing -Jet Dynamics
    -Extreem Throttle -Jettrim

  7. #7
    PWCToday Regular watersled's Avatar
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    Dawsonville, GA
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    106

    Re: Re-pitching an impeller

    I'm running the stock head right now, roughly 145/145 compression.
    Sport Stock and Sport GP #346
    -IPD Graphics -Lucas Oil
    -Riva Racing -Jet Dynamics
    -Extreem Throttle -Jettrim

  8. #8
    PWCToday Guru HXLOCO's Avatar
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    Re: Re-pitching an impeller

    Quote Originally Posted by tshank123 View Post
    49 seems kinda high for such low RPM. Im wondering if your pitch is too high, or higher than you think.
    Right on Tim 49 my blaster with more stuff than you have barely turns 48 49 mph at 7250 rpm but the acceleration is decent it could be r the prop too tall or maybe the pipe too cold

  9. #9
    PWCToday.com Is My Home Away From Home tshank123's Avatar
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    Re: Re-pitching an impeller

    Quote Originally Posted by HXLOCO View Post
    Right on Tim 49 my blaster with more stuff than you have barely turns 48 49 mph at 7250 rpm but the acceleration is decent it could be r the prop too tall or maybe the pipe too cold
    Hoping to get on the line with you at some point this season. I'm in the middle of a sport spec blaster build. I want to have fun in sport again.
    FN Wealth Management - http://www.fnwealth.net/
    High Speed Industries - TBA
    RIVA Motorsports - http://rivaracing.com/
    Competitive Crankshafts - http://competitivecrankshafts.com/

  10. #10
    PWCToday.com Is My Home Away From Home tshank123's Avatar
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    Re: Re-pitching an impeller

    Quote Originally Posted by watersled View Post
    I'm currently running a swirl 12/17 but I don't think I am getting the RPM's and speed out of my ski. My set up is:

    62t/61x
    dual 38's jetted 135 main, 70 pilot, stock needle and seat, stock spring
    Factory limited pipe
    rear waterbox and rear outlet
    Flow control valve
    dual cooling
    MSD enhancer

    With this setup I was only pulling 6550 RPM and 48-49 MPH. I'd like to just re-pitch the impeller I have but what would I want to pitch it to for racing? Also, feel free to critique my current set up as well. Thanks!
    Quote Originally Posted by watersled View Post
    I'm running the stock head right now, roughly 145/145 compression.
    With what you have I wouldn't expect much more out of it. Stock head, stock 38s, 61x cylinder with a limited chamber, those are your limiting factors here. Still its not bad top speed wise, I just wonder how the acceleration out of corners is.
    FN Wealth Management - http://www.fnwealth.net/
    High Speed Industries - TBA
    RIVA Motorsports - http://rivaracing.com/
    Competitive Crankshafts - http://competitivecrankshafts.com/

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