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Thread: Water volume of a jet ?

  1. #1
    1968Droptop
    We talk about pressure a lot, but what about volume ? I'd like to know how many GPH the water inlet for engine cooling delivers.
    I'm adding a chiller to my enigne, but only have one ear on my Dominator pump. It's currently 1/2"npt, but I'm thinking about opening it up to 3/4" or 1". I'm hoping it'll have enough GPH to feed the engine and the chiller ? Will this cause any troubles ? Will it have enough volume to feed my chiller (two 3/4" inlets and outlets), and my engine ? Chiller's like volume but not pressure. Thanks.

  2. #2
    Senior Member
    Join Date
    Aug 2009
    Posts
    454
    Droptop,
    I have been thinking about the same thing.
    on my last boat I had a American turbine SD309
    pump it had a prevision cast into the suction housing for a
    second outlet, I called Ron at AT he told me to drill and tap
    it. It was my plan to run the second outlet to the intercooler for a prochager. I sold the boat before I installed the blower. now on my Dominator pump
    I am considering drilling and taping the opposite side.
    Maybe I will give Ron a call and get his opinion.

  3. #3
    Duane HTP
    With the amount of pressure a jet pump makes, there is more than enough cooling water available from the existing 1/2" outlet to handle the job.
    Here's the way we do it. We put one of our Water Bypass Kits on to start with. This controls the water pressure for the engine at a safe level. You then take the water from the relief side of the bypass valve and run it to the super chiller, then overboard. The reason this works so well is that at idle the bypass is not working and all water goes through the engine. This lets the cooler heat up a little bit so that the fuel doesn't puddle in the intake and make the engine act like it's cold every time you take off. Then when you do take off, the Water Bypass Valve puts the fresh cool lake water through the intercooler. If you run the bypass water to the inter cooler with 8 an hoses, then run the overboard water from the intercooler with 10 an lines, you don't have to worry about overpressuring the intercooler.
    If you have more questions about this set up, you can call me at 417-858-8616 or e mail me at doblander@hi-techperformance.com .

  4. #4
    BrendellaJet
    Duanes Setup sounds good. If you dont want to mess with your water pressure though, you could probably run a pickup off your ride plate or mount it elsewhere...Would probably perform in a similar fashion.

  5. #5
    Duane HTP
    You are right. That works good too. The main thing is to NOT have water running through the chiller at idle.

  6. #6
    Senior Member
    Join Date
    Aug 2009
    Posts
    454
    You are right. That works good too. The main thing is to NOT have water running through the chiller at idle.
    Would this be true for a intercooler on a procharger system?

  7. #7
    From the Berk website, gotta assume A/T & Dominator would be in the same ballpark
    "The jet drive does not know how heavy your boat is, or what speed the boat runs. Simply, the Berkeley jet drive in your boat is matched to the engine and will deliver about 1400-1800 pounds of thrust while pumping 3000 to 4000 gallons of water every minute at a pressure of 60 to 180 pounds per square inch (PSI)."

  8. #8
    UBFJ #454
    From the Berk website, gotta assume A/T & Dominator would be in the same ballpark
    "The jet drive does not know how heavy your boat is, or what speed the boat runs. Simply, the Berkeley jet drive in your boat is matched to the engine and will deliver about 1400-1800 pounds of thrust while pumping 3000 to 4000 gallons of water every minute at a pressure of 60 to 180 pounds per square inch (PSI)."
    I found this other older information on another site:
    A static flow test was conducted at American Turbine Pump Company to compare pumping efficiencies of the American Turbine vs. the Berkeley impeller and bowl. The pumping test pit equipment utilized Halliburton flow meters, met the standards set by the Bureau of Reclamations and outputted data to a computer for increased accuracy. The impellers used in the test were Berkeley's "A2" and American Turbine's "AA". Bowls and impellers were factory direct, off-the-shelf items.
    The results are given in the following table.
    H.P GALLONS PER MINUTE BOWL P.S.I
    American Berkeley American Berkeley
    250 3,503 3,494 93.4 90.8
    275 3,617 3,605 99. 5 96.6
    300 3,722 3,708 105.3 102.1
    325 3,824 3,811 111.1 107.8
    350 3,921 3,905 116.8 113.0
    375 4,009 3,995 122.1 118.4
    400 4,098 4,08? 127.5 123.5
    425 4,182 4,167 132.8 128.7
    450 4,262 4,248 137.9 133.8
    Given the bowl psi's in the above Table, the tests had to have been run for pumps used in industrial applications and at relatively low rpm's, maybe something like 2,400? ... perhaps the Bureau of Reclamation has a standard rpm for testing?
    In any case, today with higher Hp motors in our boats it's not uncommon for bowl/nozzle psi's to be near 350 psi @ WOT ... a 3.125 nozzle with a 350 psi bowl pressure produces between 5,300 & 5,400 pounds of thrust.

  9. #9
    Duane HTP
    Would this be true for a intercooler on a procharger system?
    Yes, it works better that way.

  10. #10
    bp
    a 3.125 nozzle with a 350 psi bowl pressure produces between 5,300 & 5,400 ft. pounds of thrust.
    how did you come up with this? what are ft.pounds of thrust? i've never seen thrust or force described in ft. pounds.

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