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Thread: Water pumps

  1. #1
    Member JUNIOR BUILDER
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    Water pumps

    Does anyone have tech data on mechanical water pumps. Specifically flow rates at different RPM's. How much an advantage over stock with an aftermarket "High Flow"?

    All the electric pumps advertise flow in GPM (they don't say at what pressure).

    I'm trying to answer some questions about pully drive ratios, rpm's, flow rates, and pressure.

    Thanks, Steve

  2. #2
    Senior Member RACING JUNKIE
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    Interesting question. The electric flow rates are what they are.
    The driven pump rate will always depend on drive ratio.
    Dave
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  3. #3
    Senior Member RACING JUNKIE TheYellaBrick's Avatar
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    Quote Originally Posted by oldandtired
    Interesting question. The electric flow rates are what they are.
    The driven pump rate will always depend on drive ratio.
    Dave

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  4. #4
    Member JUNIOR BUILDER
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    I found this on Stewart's site. Interesting. They are both "High Flow" pumps. An electric pump will work well for street cruising between 2000 and 2500 rpm, but maybe not at sustained high rpm. At the drag strip I think an electric is by far better.

    I am certain at high rpm with high flow there would also be higher pressure (good thing). Pully ratio would be nice down low, but with a penalty up high.

    You can see where the numbers go:

    Flow in GPM (Gallons Per Minute)
    RPM Competitors Pump Stewart Stage 1
    1000 17 18
    1500 25 32
    2000 34 42
    2500 42 55
    3000 51 65
    3500 59 77
    4000 68 90
    4500 76 101
    5000 85 112
    5500 93 122
    6000 102 132
    6500 110 138
    7000 119 148
    7500 127 157
    8000 139 158

    Their site is a good read:

    http://www.stewartcomponents.com/Tech_Tips.htm

    Steve

  5. #5
    Member JUNIOR BUILDER
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    And then there is this from Edelbrock...

    http://www.jegs.com/edelbrock/graphs/350-8810.jpg

  6. #6
    Senior Member DYNO OPERATOR
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    electric pumps will always be the same since the engine is not driving it.


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