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  1. #1
    Hydrotoys's Avatar
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    SHO/FZR pump vien blowouts

    Ever notice how these things blow out in round-style holes around the edges?

    Ever seen a STOCK ULTRA250 pump? Note the round holes in the leading edges of the pump.... Pre-relieved.


    There is a hydro-lock happening on the leading edge of these pumps between the blades and pump. You might as well take a hammer and smack your pump over and over till it breaks.

    This isn't cavitation... this is good ol' fashion hydro-locking. Cavitation will boil SST just like aluminum, only slower.

    These damaged pumps are pressure damaged... or if you will, "self-relieved."

    A wise tuner might equally relieve his HO/FZR/SHO pump in the EXACT area about the size of a quarter on each blade, and clean up the area afterwards.


  2. #2
    cheatin' piston popper addicted's Avatar
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    makes sense. has anyone tried an ultra pump conversion on one of these? with the roots blower i would imagine that the ultra has the most torque out there

  3. #3

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    Quote Originally Posted by Hydrotoys View Post
    Ever notice how these things blow out in round-style holes around the edges?

    Ever seen a STOCK ULTRA250 pump? Note the round holes in the leading edges of the pump.... Pre-relieved.


    There is a hydro-lock happening on the leading edge of these pumps between the blades and pump. You might as well take a hammer and smack your pump over and over till it breaks.

    This isn't cavitation... this is good ol' fashion hydro-locking. Cavitation will boil SST just like aluminum, only slower.

    These damaged pumps are pressure damaged... or if you will, "self-relieved."

    A wise tuner might equally relieve his HO/FZR/SHO pump in the EXACT area about the size of a quarter on each blade, and clean up the area afterwards.
    Has anyone got any picturs of a Kawi pump stator showing these round holes?

  4. #4
    305coco's Avatar
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    Quote Originally Posted by 2fast4u View Post
    Has anyone got any picturs of a Kawi pump stator showing these round holes?
    pics where posted on the kawi side but cant find them

  5. #5
    305coco's Avatar
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  6. #6
    Duke's Avatar
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    It doesn't prevent cavatation but simply the inevitability of things to come. JMO.

  7. #7
    RUSH.'s Avatar
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    I always wondered why the kawi pumps werent used more often in conversion skis. They seem pretty ahead of the game in that area.

  8. #8
    SHOBiz's Avatar
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    So, having this happen is not necessarily the end of the pump?
    What impact does having these 'reliefs' have on the performance of the ski/pump? I am assuming this is essentially a band-aid? Something I am tired of doing if possible...

  9. #9
    DP.'s Avatar
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    Pump blowout

    Tested.
    Found one of ours on Saturday with 2 veins damaged so i continued and did the rest and cleaned them up. Tested it but not finished testing, I want to try a couple of prop combos to be sure.
    The ski was faster though.

  10. #10
    Moderator RX951's Avatar
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    Quote Originally Posted by 305coco View Post
    , interesting......I had no idea the Kawi pumps were like this

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