Jet Pump Dyno
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Jet Pump Dyno

  1. #1

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    Default Jet Pump Dyno

    Anyone ever heard of or seen one? Any of the major pump mfgs got one?

    If there is one it would probably take up a whole room. At most basic level, it would check flow, pressure and exit velocity at various RPM's. Ultimately it would also allow testing of different inlet angles, different simulated hull speeds, maybe even different water temps.

    With the dozens of variables going on to get top performance out of a jet boat, I would love to be able to take the engine and the hull out of the picture and know exactly what my pump (and intake) is doing at speed.

    Is there one? I would like to rent time on it.

    It probably looks like this:
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  3. #2
    jetboataholic HawaiianJet's Avatar
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    Question

    Where did you get that picture?
    HJ

    ***FOR SALE*** 1978 19' Full Stringer Hawaiian Molokai Jet Boat w/ Berkeley 12JC-AB and Chevy 440 Tall Deck ***FOR SALE***

    Quote Originally Posted by mako shark mark View Post
    Oh yeah, Forgot to mention that the hull is a special mixture of speedcote, herculiner and rain-x, all blended together- good for another 8 mph top end.

  4. #3
    Resident Ford Nut Sleeper CP's Avatar
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    Default

    This might get interesting......


    It's been talked about by several manufactures but nothing trick has been built. One producer basically installed a "strain" gauge on the drive shaft of his 1,200 hp engine with it he can measure the trq required to spin an impeller to 7,000 rpm.

    There's a thread on here somewhere on this topic, you may want to do a search, or someone can bump it.

    A clean efficient boat with room in it makes a lot of since to use because of the loading (intake pressure) to the impeller can be easily adjusted with shoe's or loaders.

    It is my understanding that the extended impeller chart that Jac Seastrum worked out yrs ago for the Berk impeller's was done by placing a impeller (not sure if it was an entire pump assembly ) in a deep well 300'+ and spun the impeller's with a vary large electric motor:



    I just need to win the lotto, Neil (SDPM) and I could build one ( pump dyno)with all the crap my dad has at his yard. We'd just need a 1,000 hp electric motor, but it would be easier to build a 1,200 hp engine and install a stain gage on a drive shaft.

    Edit: I looked for the thread and couldn't find it, but my search skill's aren't all that good. Maybe someone else can find it.

    Sleeper CP
    Big Inch Ford Lover
    Last edited by Sleeper CP; 10-02-2008 at 08:24 AM.

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    Amber Racing Services BUSBY's Avatar
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    Default

    Someone has some SolidWorks/CAD skills


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    21 Daytona Outlaw's Avatar
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    Default

    Haliburton
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  8. #6
    Amber Racing Services BUSBY's Avatar
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    Quote Originally Posted by Outlaw View Post
    Haliburton
    Halliburton works on Berkeley jet pumps? Wow ... now I don't feel so bad about where my tax dollars are going to

  9. #7
    Senior Member LicktySplitJr's Avatar
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    The only thing I could see being a problem is setups on pumps are different depending on the bottom of the hull. I may be off on this one but you would only be able to read nozzle pressures and get flow data, but even that would change with different setups and that would change from hull to hull. So would the purpose be to make the pump flow the smotthest, best amount of water then apply your setup?........Correct me if im wrong, maybe im not understand.

  10. #8
    Senior Member NO BUTT NO PUTT's Avatar
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    Default

    What about a setup like a O2 senser but in the nozzle or bowl?
    Something that could take a reading of the bowl or nozzle at speed, thrust, flow, ect?

  11. #9
    Senior Member GT Jets's Avatar
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    Probably going to get verbally abused for this, but I fail to see the value of a pump dyno, what info would you hope to obtain and what would you do with it?

    A jetpump is literally just a centrifugal pump, really nothing more, with a good pump curve and an idea of how much shaft horsepower is available (at a known RPM), it really does not go much further than that, just my opinion but for the amount of money in research and development it would take, I'm not sure you would have something in the end you could not do with a lake...

    By the way there is such a thing as an ultrasonic flowmeter, it measure the flow of water by the frequency that is emitted, I think it would take a lot to get it to work in the real world on a pump because it is designed to work on a straight piece of pipe, all you really need to know is the exit velocity of the water from the nozzle, multiply that by the area of the outlet hole and viola, a true GPM.

    GT

  12. #10
    "Try it Now!" Tahiti Boss21's Avatar
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    Quote Originally Posted by Sleeper CP View Post
    This might get interesting......


    It's been talked about by several manufactures but nothing trick has been built. One producer basically installed a "strain" gauge on the drive shaft of his 1,200 hp engine with it he can measure the trq required to spin an impeller to 7,000 rpm.

    There's a thread on here somewhere on this topic, you may want to do a search, or someone can bump it.

    A clean efficient boat with room in it makes a lot of since to use because of the loading (intake pressure) to the impeller can be easily adjusted with shoe's or loaders.

    It is my understanding that the extended impeller chart that Jac Seastrum worked out yrs ago for the Berk impeller's was done by placing a impeller (not sure if it was an entire pump assembly ) in a deep well 300'+ and spun the impeller's with a vary large electric motor:



    I just need to win the lotto, Neil (SDPM) and I could build one ( pump dyno)with all the crap my dad has at his yard. We'd just need a 1,000 hp electric motor, but it would be easier to build a 1,200 hp engine and install a stain gage on a drive shaft.

    Edit: I looked for the thread and couldn't find it, but my search skill's aren't all that good. Maybe someone else can find it.

    Sleeper CP
    Big Inch Ford Lover
    Sleeper cp, is it bad that my RPM range isn't even on that chart? Can you bring out the sissy chart for us 4500 rpmmers? ;(
    1992 Eliminator Daytona 21'

  13. #11
    jetboataholic HawaiianJet's Avatar
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    Exclamation

    Quote Originally Posted by Tahiti Boss21 View Post
    Sleeper cp, is it bad that my RPM range isn't even on that chart? Can you bring out the sissy chart for us 4500 rpmmers? ;(
    Here ya go!!! Assuming you have an A, spinning at 4500 rpm, you're looking at right around 330 hp, according to the chart.

    HJ

    ***FOR SALE*** 1978 19' Full Stringer Hawaiian Molokai Jet Boat w/ Berkeley 12JC-AB and Chevy 440 Tall Deck ***FOR SALE***

    Quote Originally Posted by mako shark mark View Post
    Oh yeah, Forgot to mention that the hull is a special mixture of speedcote, herculiner and rain-x, all blended together- good for another 8 mph top end.

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