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  1. #1
    mtrager's Avatar
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    To seal the pump or not ?

    Last month we were talking about the buck. Some have said sealing the pump creates the pressure we are having in the pump tunnels.

    Duke installed the [email protected] tunnel kit in Seadoolovers Yamaha. His ski has
    an incredible hole shot and does not spin with his pump shoe just bolted up
    with no sealant.

    Last week I tried it on my triple pipe with Scat pump and Scat prop. It
    worked great. It slipped a couple of times but most of the time it hooked up while we were racing and did great. The great thing about the triple
    was that I had 1/2 the shims in the tabs and more angle on the plate.

    This combo with a sealed pump would be a buck wagon for sure with the 1200 grate I was running.

    I was so happy I put my dynafly and 05 pump on for races this weekend in Tampa thinking This would be fast with no buck. This morning I went for a spin to make sure it would be OK and it burns the prop badly from a dead stop. There was no buck and It had great top speed but can not go from a dead stop. I even put The FF plate on the triple with 1200 grate and was driving threw small waves at 80 plus and the ski was smooth as silk.

    My conclusion, On a single it is not a must.

    On my triple, with out the pump sealed, it spins my fastest dynafly with the best hole shot like it never has from a dead stop.
    No buck. Not even racing through rough water At speeds that would have made me nervous with a 1200 grate when my pump was sealed.

    I know every one is is thinking seal the pump. If I do it will have a hole shot but when your rocking with other people and you are coming from behind as the speeds increase and you hit sloppy water it gets scary.

    Any thoughts would be welcomed.


  2. #2
    THE PLATE MAN JIM'S PERFORMANCE's Avatar
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    Hello Mark, Did you try it by sealing the back part of the shoe and leaving the rest alone. And see you on sunday.

  3. #3
    mtrager's Avatar
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    Jim,

    No, I just tried it unsealed. That sounds good but if it does not work
    I would have to break another shoe getting it off.

    Is there any thing you could use to seal to try that would not be so
    permanent ?

    Like silicone or something.

  4. #4
    Moderator RX951's Avatar
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    Quote Originally Posted by jims 1300 View Post
    Hello Mark, Did you try it by sealing the back part of the shoe and leaving the rest alone. And see you on sunday.

    this si what I did on my wife's 2002. I intalled the PPK, but no did not seal the shoe. I did run a bead of silicone where the felt strip was to help minimize cavitation from that gap there. the shoe can now be removed easily whenever I want. But where the shoe meets the transom, its sealed.
    I can't say how my holeshot is yet because I still need WFO to check out my EFI stuff. wehn I get her lined out, I'll give y'all a 411

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