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Thread: cavitation

  1. #1

    Join Date
    Oct 2006
    Location
    UNITED KINGDOM
    Posts
    160

    cavitation

    Hi guys your help is needed
    i have an 04 gpr fitted with a 14 vein skat pump but have fitted a 14/20 dynafly,ski now suffers with terrible cavitation on holeshot.

    04 gpr
    vf3,s
    riva heads 150 psi
    trued and welded crank
    d plate
    efi controller
    ported cyl,s
    3 degree key
    gas valves
    1200 grate
    re cut ride plate .980
    rienforced pump tunnel
    jetworks kit
    free flow


  2. #2
    Moderator beerdart's Avatar
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    Is your shoe stuffed and sealed??

  3. #3
    ecpChris's Avatar
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    also did u check the prop to wear ring clearance?

  4. #4

    Join Date
    Oct 2006
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    UNITED KINGDOM
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    cavitation

    ski has all cavities filled and liner is new plastic version.
    was the dynafly the wrong choice?

  5. #5
    did you use 4200 on the pump shoe? did you leave the foam strip on the back of the shoe when you installed it? if so i would reccomend removing the foam strip and use 4200, in addition to the rest of the shoe. the oem foam has a tendancy to fail.

  6. #6
    mrbtd's Avatar
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    You need more prop than a 14/20 with those mods.

    Did it cavitate before the mods ?

  7. #7

    Join Date
    Oct 2006
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    UNITED KINGDOM
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    Cavitation

    I have the skat prop but it is 15/23 and the motor will only pull 7010 rpm but doesnt cavitate as much only initially then it hooks up well it should be a 70 mph ski

  8. #8

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    Oct 2006
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    Cavitation

    Removed foam and used 5200 and set pump as h204u instructed .have not moved shoe only changed prop to try and gain rpm,s but killed holeshot.
    My 06 with stock ish motor has better holeshot by a mile.

  9. #9
    cmherrera's Avatar
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    Dec 2007
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    cavitation

    I have the same set up and I sealed the pump. skat magnum 14V set back pump 15/22 prop.also has terrible cavitation.

  10. #10

    Join Date
    Oct 2006
    Location
    UNITED KINGDOM
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    cavitation

    hi cm are you using the skat prop or a dyna fly.
    i will try the 15/23 skat prop again but may bend it slightly.will post result after weekend

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