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  1. #1
    Mentally Unstable dochere195's Avatar
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    Difference in these impellers?

    Hey Dave, just sent a 13/20 down for the Worx. In the interim I am going to put on a different impeller and was wondering what the difference between the impellers listed would be, assuming same ski with same exact set-up. What would each offer compared to one another. I own each list but have yet tested 2 of them and I am trying to get an idea of what to expect from each one.

    Thanks.

    11/19
    12/20
    13/20
    13/21


  2. #2
    Impros's Avatar
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    The lower pitch combination will allow higher engine rpm's, and the taller pitch impellers will limit the rpm. There is a window on a ski of where too low of pitch causes cavitation rather than producing good, efficient acceleration, and too tall limit's the engine from producing maximum hp, and overall performance. If you've got a 4 stroke, they are very sensitive to needing to be in the right rpm range or you'll see significant speed loss.

  3. #3
    Dave, so why would the stock prop on a nearly stock ski have more throttle left? is it a comprimise?

    I`m actually looking for a better cruising rpm range, is this possible.
    say I`m doing 45-48 mph @ 6200, can I get the same speeds at lower Rpm`s? and vise versa, can I then get maybe 50-52 at the 6200R range?... PR...

    Thanks for your input, I know your busy!...

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  5. #5
    bigrich007's Avatar
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  7. #7
    Quote Originally Posted by Pale Rider View Post
    Dave, so why would the stock prop on a nearly stock ski have more throttle left? is it a comprimise?

    I`m actually looking for a better cruising rpm range, is this possible.
    say I`m doing 45-48 mph @ 6200, can I get the same speeds at lower Rpm`s? and vise versa, can I then get maybe 50-52 at the 6200R range?... PR...

    Thanks for your input, I know your busy!...
    Dave?...PR...

  8. #8
    MR. SCOVILLE UNIT SUCKMYWAKE's Avatar
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    Quote Originally Posted by Pale Rider View Post
    Dave, so why would the stock prop on a nearly stock ski have more throttle left? is it a comprimise?

    I`m actually looking for a better cruising rpm range, is this possible.
    say I`m doing 45-48 mph @ 6200, can I get the same speeds at lower Rpm`s? and vise versa, can I then get maybe 50-52 at the 6200R range?... PR...

    Thanks for your input, I know your busy!...

    i think the cruising range might not come into play when repitching. i think most of it is either bottom or top end when dealing with the angles

  9. #9
    Quote Originally Posted by SUCKMYWAKE View Post
    i think the cruising range might not come into play when repitching. i think most of it is either bottom or top end when dealing with the angles
    so what your saying is that pitch adjustment only affect bottom or top end?...PR...

  10. #10
    MR. SCOVILLE UNIT SUCKMYWAKE's Avatar
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    yeah, thats what i am thinking. the mid( cruising) might not come into play

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