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  1. #1
    Site Admin Green Hulk's Avatar
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    Polishing the pump

    Do you guys ever smooth out your pumps? Does it help top speed?
    I don't know about the yami pumps, but the RXP pump has a real rough texture. Im just wondering if it would be worth my time to smooth it out.


  2. #2
    Moderator Insanediego Joe's Avatar
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    Since the gpr has a cast aluminum pump there are casting flaws and molding marks. I have vlue printed or polished the pump. I cant say if it improves anything for sure but im happy knowing the flaws are gone.

  3. #3
    Site Admin Green Hulk's Avatar
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    Yea, the RXP pump is cast aluminum as well.

  4. #4
    Johnjet's Avatar
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    for guys who are looking for top speed I would say it's a must

    has any one flowed there pump after blue printing to see if there is a increase in volume or speed ?

  5. #5
    Its the fact that you are not getting as much turbulance that makes them go better
    but its not really in flat water you will notice it
    its more a rough water hookup thing
    you will not drop as much speed
    but its worth while doing for sure

  6. #6
    Site Admin Green Hulk's Avatar
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    Cool deal, thanks for the info guys!

  7. #7
    Pistonwash's Avatar
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    No, it does absolutely nothing.

    It is conjecture at this point for the benefits, if any. We did this in the early 90's thinking it would help. We had our pumps Extrudehoned, we grinded out castings. Well, then came the radar gun runs to see if it worked. Nope. In some instances it actually hurt top-end performance. This is why the Skat Trak pumps have larger hubs. You want MORE material in the pump, not less, for better hook-up.

    And as far as top-end help..there are better ways to increase your speed other than grinding your pump or getting out the imperfections. To say that taking out a very little amount of material helps in hook-up is more mental than reality. I have never seen it work. Put a Skat prop and pump in...there is a night and day difference.

    Put a FX pump in your single piped GPR and gain 1 mph and better hook-up. Why? Because it has a larger diameter hub, which means less water is passing through. Got it?

  8. #8
    Moderator Insanediego Joe's Avatar
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    See now yall(thats southern) got mikey riled up! I said I couldnt confirm any gains at all. I just felt better knowing I wasted my afternoon removing the casting flaws. Thanks Mike

  9. #9
    Hydrotoys's Avatar
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    That RXP pump is a work of ART compared to the GPR pump. Leave well enough alone. Heck I'd be more worried about that whole flimsy bearing design that BuRP released. If you could fix that, then you'd gain way, WAY, more than any polish job.

  10. #10
    Pistonwash's Avatar
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    Quote Originally Posted by Insanediego-gpr
    See now yall(thats southern) got mikey riled up! I said I couldnt confirm any gains at all. I just felt better knowing I wasted my afternoon removing the casting flaws. Thanks Mike
    Sorry Joe..did'nt mean to pee on your parade.

    If I had a dollar for all the little snake oil charms we have tried over the years. I'd be riding Fountain boats not jetskis. If anything, always make sure everything is lined up properly and clearances (shoe, intake, rideplate) don't impede your speed.

    of course you knew that already...you saw the pump mod I gave Mark.

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