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  1. #1
    rob2337's Avatar
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    Custom Plastic Pump Extension - Feedback Appreciated

    Hey Guys,

    I am just fooling around and decided to make a pump extension for my SL 650 out of plastic pipe. I found some 1/2" thick side wall plastic pipe material of almost the same inside diameter.

    I threw it on a lathe and bored it out the required ID and machined the step on the OD so it mates with the stator.

    Currently my impeller is pretty trashed from sucking up something and i am about to change it for a new one. I thought this idea could be like SeaDoo wear rings, so when I suck up something it will take out the plastic extension, not the impeller.

    Any feedback or concerns before I try this? The only thing I can think about is that it may not be rigid enough, but it seems pretty damn solid.
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  2. #2
    SPEED KILLS, BUT YOU GET THERE QUICKER Keddano's Avatar
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    Should work fine really.

  3. #3

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    what if it cracked under just polaris power

  4. #4
    SPEED KILLS, BUT YOU GET THERE QUICKER Keddano's Avatar
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    You could run it behind the prop like the pro's run than you wouldn't need a longer driveshaft,water tube. I'd give it a try,nothing to lose.

  5. #5
    rob2337's Avatar
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    I have all the stuff for an extended setup. I was going to try it with the extension before the stator

  6. #6
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by rob2337 View Post
    ... Any feedback or concerns before I try this? ...
    Make sure the front and rear faces are 100% parallel, and at right angles to the axis.

    Are you locating this extension section forward of the stator? If so, then make sure the stator is aligned with the drive shaft axis.

  7. #7
    johnsonmtz's Avatar
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    Quote Originally Posted by rob2337 View Post
    I threw it on a lathe and bored it out the required ID and machined the step on the OD so it mates with the stator.

    Any feedback or concerns before I try this? The only thing I can think about is that it may not be rigid enough, but it seems pretty damn solid.
    Okay, if you're capable of machining material like this, I'm going to assume that you've checked, and double check dimensions and tolerances. In that regard I'm sure you're fine.

    The only thing that may be a possibility is variable rates of expansion between the plastic and aluminum pump sections.

    I'm just throwing out ideas here, so I'm not certain how accurate this may be:
    The water is under HUGE shear forces in the pump creating friction and some heat. The presence of the engine exhaust outlet probably causes a slight increase in temperature in the immediate area as well. With all the water around everything I'm not really sure exactly how much heat builds up, but there must be some temp increase. The question then becomes, what happens to this plastic pipe in the presence of that heat and friction. Will the pipe hold it's shape or will it expand and deform.

    Since it's only plastic, my guess is you have nothing to lose. If it deforms and warps under the pressure the only thing that will happen is the impeller shaves it a bit. I'd say give it a test run and then recheck your measurements. If it holds up, you've found a good option for replacement wear rings!!!!

    KJ

  8. #8
    cheatin' piston popper addicted's Avatar
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    Looks good. schedule 80 is pretty tough stuff. aside from alignemnt and parallelism as mentioned earlier, i would torque the bolts in steps and make sure it's square afterwords. or, better yet, try to make aluminum spacers for the bolts to take the load off the plastic.

  9. #9
    Bing-A-Ding-Ding-Ding, Brrrrrap! Brrrrrrrrrap!!! Polaris_Nut#1's Avatar
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    go for it! Can't wait to hear good results. Might be a new product line. ya never know.

  10. #10
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Rapid wear, possible deformation, and if it fails, I think you'll need to be towed in for sure.

    Interetsed to see if I'm wrong though.

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