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  1. #1

    Updated Nozzle Size Vs Pump Pressure

    I have not updated this since about a year and a half when we use to use 100psi pumps which are different from the new custom ones we have now, Kinda forgot to check to see the differences.

    Well here is what I got.

    Test conducted with a snubbed 3" Glycerin-Filled Gauge with NIST Certificate. Keeps things nice and smooth with no guessing on accuarcy.

    12-30VDC Power supply at 13.25 volts. All numbers rounded down to the nearest multiple of 5.

    M2 230psi
    M3 225psi
    M4 215psi
    M5 190psi
    M7 180psi
    M10 170psi
    M12 Not tested (didnt have one handy here on Guam)
    M14 155 psi

    A pretty big jump in numbers over the old pump due to the change in the cams and other minor changes.

    You really don't want a excessive amount of pressure do to additional stress on the seals and internals of the pump. The number were a bit higher than I expected with the M3 and M2.

  2. #2

    Re: Updated Nozzle Size Vs Pump Pressure

    Hi - I am a bit confused by this.

    Could you tell me with regard to the pump pressures being 225psi on the M3 nozzle - does this mean that because the nozzle size calculator assumes 100psi that I should roughly divide the nozzle size generated by the calculator by half?

    Ie. if the calculator recommends I use a 6GPH nozzle but I am using a smaller 3GPH nozzle then I only in fact need a 3GPH nozzle?

    Many thanks.

  3. #3

    Re: Updated Nozzle Size Vs Pump Pressure

    i wonder what it is with dual m-10's

  4. #4

    Re: Updated Nozzle Size Vs Pump Pressure

    Quote Originally Posted by Kong_loo View Post
    Hi - I am a bit confused by this.

    Could you tell me with regard to the pump pressures being 225psi on the M3 nozzle - does this mean that because the nozzle size calculator assumes 100psi that I should roughly divide the nozzle size generated by the calculator by half?

    Ie. if the calculator recommends I use a 6GPH nozzle but I am using a smaller 3GPH nozzle then I only in fact need a 3GPH nozzle?

    Many thanks.
    Bump. Anybody have an answer to this? Thanks!

  5. #5

    Re: Updated Nozzle Size Vs Pump Pressure

    bump

  6. #6

    Re: Updated Nozzle Size Vs Pump Pressure

    I had posted about this in the nozzle selector section a while back.

    Flow does not work like people think, It does not double just because the psi doubles. Years ago I thought the same way until finding out from the makers that is not the case.

    This is closer to what the nozzle put out, But it depends on voltage output of your vehicle.

    M2 230psi = 2.9GPH
    M3 225psi = 4.2GPH
    M4 215psi = 5.5GPH
    M5 190psi = 6.7GPH
    M7 180psi = 9.0GPH
    M10 170psi = 12.5GPH

    20psi increase above 200psi on a 2GPH nozzle is around .1GPH increase in flow. at 200psi it is 2.7gph at 240psi it is at 3.0gph, 300psi it will flow 3.3gph. Many assume if you douple the pressure you double the flow but it's not correct.

  7. #7

    Re: Updated Nozzle Size Vs Pump Pressure

    Thank you.

    Now, with the latest kit it is my understanding that the pump pressure switch is pre-set to shut off at ~150psi. So if the nozzle size calucator suggests a particular flow rate, and the nozzles flow rates are measured at 100psi, then the nozzle should be at least somewhat smaller than the caluclator suggests, correct?

  8. #8

    Re: Updated Nozzle Size Vs Pump Pressure

    Yes, just a tad under what the calculator states. Even though the pressure switch cycles it cannot do it fast enough to cause a drop in the pressure in the line. It only fluctuates by about 10 to 20psi max due to the ID of the hose holding pressure.

  9. #9

    Re: Updated Nozzle Size Vs Pump Pressure

    how can i tell if i have older pump?

  10. #10

    Re: Updated Nozzle Size Vs Pump Pressure

    We switched to these in late 2006.

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