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Pump Questions

  1. #1
    Senior Member 81bahner's Avatar
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    Default Pump Questions

    I have a 12jc and am building a 650hp and 675lbs apox.....and wondering what impeller to use to get 70+

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  3. #2
    Resident Ford Nut Sleeper CP's Avatar
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    This should keep you busy for a bit:

    It may or may not help ?

    http://www.performanceboats.com//showthread.php?t=6820

    You forgot to mention at what rpm ? That might help a bit..

    Sleeper CP
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    fast is the other half.
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  4. #3
    Senior Member 81bahner's Avatar
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    Quote Originally Posted by Sleeper CP View Post
    This should keep you busy for a bit:

    It may or may not help ?

    http://www.performanceboats.com//showthread.php?t=6820

    You forgot to mention at what rpm ? That might help a bit..

    Sleeper CP
    Big Inch Ford Lover
    ty just what i was looking for......

  5. #4
    Senior Member Robert Jonsson's Avatar
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    is this a running boat right now. and if so, how fast is it going and at what rpm?

  6. #5
    Senior Member 81bahner's Avatar
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    Quote Originally Posted by jet4fun View Post
    is this a running boat right now. and if so, how fast is it going and at what rpm?
    nope but i am getting the pump built thats why i ask.....

  7. #6
    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    Quote Originally Posted by 81bahner View Post
    I have a 12jc and am building a 650hp and 675lbs apox.....and wondering what impeller to use to get 70+
    Well, to start, with that HP, I would go A or AA cut, you are closing on 6,000RPM with an A Berk.

    You can ALWAYS cut it smaller for very little $$$$.

    Making it grow bigger, a bit harder.

    Once you get a setup to work from, then the adjusting starts with the shoes, droops or snoots, nozzle bushings, rideplate angles, diverter, etc, etc. Seems endless, and the posibilities are I suppose.

    What is the RPM you make 650HP at? VERY important.

    An A is no good if you don't make that untill 7,000RPM, because you'll NEVER get there. A "D" cut maybe.

    Guy on another board had a 502 dynoing 718HP @7-grand
    Put a Berk A cut behind it, made 4,000RPM, MAX, due to the way the power development was.
    My 350HP 454 spun same impeller 4,800RPM.
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