Inducer Impellor
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Inducer Impellor

  1. #1
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    Default Inducer Impellor

    Question for those who have been there and done that. While inspecting pump impellor on 12JG pump I noticed a very tiny amount of movement of the inducer impellor on the shaft. Tiny as in being barley noticeable. I was told the pump was fresh when I bought the boat late last year. Boat is used mainly for pleasure. If I understand correctly the pump impellor seats against the inducer impellor, holds it against a shoulder on the pump shaft and is driven through a key. Any thoughts as to next step I should take?

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    High Performance Marine ARS Marine's Avatar
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    At least pull the bowl off and check the impeller nut to make sure its tight!!
    You are correct the impeller clamps up against the inducer, There should be no movement of that inducer !!! If the impeller nut is tight you should be able to install a shim between the imp and ind to clamp everything tight.

    Hope this helps.

    George Pataki.

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    Senior Member cave's Avatar
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    George, What advantage or disadvantage would the be to shim between the impellar and the induser?
    Takin it home

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    High Performance Marine ARS Marine's Avatar
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    If the shaft was machined to deep, it will not clamp up the inducer.

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    Senior Member Boat 405's Avatar
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    He's talking a small shim. Very small, like .005 or .010 probably. If more than that is needed there is a problem with something.
    Boat 405.

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    Default Inducer Impellor

    Thanks for the response. I have not pulled a pump apart before but figued that your suggestion would the the next step. Time to gain some experience.

  9. #7
    show your tits topless000's Avatar
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    i have taken them out of three different boats and the same results. the boats run better. Everything the same on a tx 16 i pulled the pre impeller and made a pass on the track and gained 2 tenths. on a daytona it ran the same et but gained 5 mph. And witness it on a place craft at the track pulled it and gained 2 tenths. i am not a big fan of them at least in my experience. just my .02

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    Senior Member Fonz69's Avatar
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    There are different inducers out there

    The new style is much better then the older ones

  11. #9
    TRG
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    Who makes the newer ones??

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    These colors don't run BLWN BUX's Avatar
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    If the nut is loose, then check to make sure the nut is the correct one for the set-up.

    If I remember correctly the stainless impellar uses a SST nylock and the aluminum impellar uses the alum. nut
    The Aluminum nut will come loose agains a stainless impellar.

  13. #11
    Boss of the McIntyre Mob danhercules's Avatar
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    From what I understand DPS is the only inducer to use. Make a heck of difference in my boat. It takes off now. LOL


    Very first TPR 21' Deck. 528 BBF 736hp on pump gas built by High Flow Dynamics

    McIntyre Mob. Where the rejects play!

  14. #12
    Boat Nut sleekcrafter's Avatar
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    Quote Originally Posted by TRG View Post
    Who makes the newer ones??
    The HM is the latest inducer, much smaller hub area, and nicely shaped blades
    Upper Midwest Power Boat Association
    DRAG BOAT RACING UMPBA #926


  15. #13
    Senior Member Hass828's Avatar
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    I have a new HM as well as a DPS. Last time out I changed over to the HM and the boat didnt like it. Came out of the hole the same but felt like it kept the azz end of the boat sucked to the water and scrubbed off quite a bit of speed.
    And yes , thats the only change since last outing.
    As for now the DPS is back in till I have more time to evaluate the HM, and why it did what it did. May be able to change up the hardware to compensate but I bet it wouldnt run any better than the DPS in the end.
    My.02
    "if we keep doing it the same way we always do..we will always get the same results"
    H8-2-W8
    [email protected] first pass

  16. #14
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    have used different ones, liked them all, most of the dps i used took the time to modify them, cut the back off into a taper and made a matching taper spacer to flow into the impellor.

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