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  1. #1
    PiMPNXP's Avatar
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    Impeller tweekers..................

    Ok guys I just purchased the largest Concord (16/21) available for my 155mm pump for my XPL. I am about 100-150rpms OVER my desired rpm. What can I don to fix this? Is there a quick crash couse? How much do I need to tweek the angle to get my desired rpms? Thanks in advance...

    Dan


  2. #2
    Site Admin Green Hulk's Avatar
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    Dan, look at the thread on prop pitching in the technical section.

  3. #3
    PiMPNXP's Avatar
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    Thanks will Doo....

  4. #4
    GTXX's Avatar
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    drop a nozzle size should do it too and may be the best route since you have a big prop already. what is your desired rpm with a 16/21?

  5. #5
    PiMPNXP's Avatar
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    GTXX,

    I'm shooting for 7450-7500 rpm single pipe(coffmans)with the repitched 61/21. I have the smallest nozzle I can find 85.5mm. I was about 150 rpms over where I needed to be. I have not really dialed it all the way because the impeller cant hold the engine rpm's back. So If I can get the rpm's down I should pick up some more speed.

  6. #6
    Hydrotoys's Avatar
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    You will. Plus, if you can go LARGER nozzle, and bring your rpms down, there is more bottom end too.

    See what I mean about HAVING to pitch props now???

  7. #7
    PiMPNXP's Avatar
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    Actually I found a 17/22 Concord that seems to work ok. I found this impeller the day after I picted my 16/21 (kinda sucks).

    How is the yama-Doo coming? Hope to hook up with you guys soon for some riding....

  8. #8
    Hydrotoys's Avatar
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    It's coming nice. The details are overwhelming. Lots of stuff to get right the first time.

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