Drag boat using a jet
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Drag boat using a jet

  1. #1
    Senior Member wizbang's Avatar
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    Default Drag boat using a jet

    How much power does it take to run 8.0 w/ a jet boat ?

    I'd like to get a few of known examples ?

    A dynoed engine power figure at a rpm that runs this 8.0 et ?

    Please no guess on the power. like " I know a guy that says his makes 1350 hp and runs 8.02 "

    Thanks

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    B1 Racing cs19's Avatar
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    Really depends on so many different things, jets take finesse to make work right.. You Can't just say with this gear, this prop and this much power you will run 8.0.

    On average id say 1100-1150hp naturally aspirated at 7000-7200 should push a decently setup tunnel to 8.0 at a fast track. A blown deal will take more, lots of weight.

    Do your research on the hull you choose and what parts you use, you'll be frustrated if you end up with the wrong stuff.

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    Amber Racing Services BUSBY's Avatar
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    Quote Originally Posted by cs19 View Post
    Really depends on so many different things, jets take finesse to make work right.. You Can't just say with this gear, this prop and this much power you will run 8.0.

    On average id say 1100-1150hp naturally aspirated at 7000-7200 should push a decently setup tunnel to 8.0 at a fast track. A blown deal will take more, lots of weight.

    Do your research on the hull you choose and what parts you use, you'll be frustrated if you end up with the wrong stuff.
    there you have it. an educated answer

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    Senior Member wizbang's Avatar
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    Quote Originally Posted by cs19 View Post
    Really depends on so many different things, jets take finesse to make work right.. You Can't just say with this gear, this prop and this much power you will run 8.0.

    On average id say 1100-1150hp naturally aspirated at 7000-7200 should push a decently setup tunnel to 8.0 at a fast track. A blown deal will take more, lots of weight.

    Do your research on the hull you choose and what parts you use, you'll be frustrated if you end up with the wrong stuff.
    Hmmm, Thank You !

    I'm "fixing" a broken engine for a guy. I'm guessing it was at the 1150 hp range as it had been run ?
    It ran 8.47 as it was on a bad tune up.

    What kind of trouble will it be to change the engine to the 1500 hp range ( both engines are blown BBC ) ?

  7. #5
    B1 Racing cs19's Avatar
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    8.47 with 1150 HP isn't real great to be honest.

    Making them 1500 HP is up to you, not sure I understand the question. As far as the boat goes you just need to make sure it's setup well and The pump has the right impeller and parts to handle the power.

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    LP-25.com Infomaniac's Avatar
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    The heavier the boat and engine, the more power it will take.

    The "poor" setup boat and pump will take more power.

    In the historically typical midwest jet boater mindset. Keep adding power until it performs.
    If For Some Reason I Do Something Worthy Of Recognition. God Provided The Ability And Deserves The Credit.


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    Amber Racing Services BUSBY's Avatar
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    CS is right ... set up and quality pump parts are everything. Also Info has a good point ... adding hp to overcome a poor set up or too much weight isn't going to help anything.

    No one here will be able to pull an answer out of their hat and give you a "guess-timate"

    Only way to know if you're making progress is to get it out on the water and do some testing. Sorry ... but that's the real answer.

    There are too many varibales.

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    Time, Patience, and $$$. Also just talk to some guys (that run good) with your hull or similiar and try to put your strategy together.

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    Senior Member UNASHAMED's Avatar
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    Set it up right and you can use less power...
    "Don't make me get my penguin"

  12. #10
    Senior Member wizbang's Avatar
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    I totally agree and do understand your thoughts and great points !

    Thank You, we'll get it on the water and gofrom there !

    Thanks again, Wiz

  13. #11
    Half a bubble off jrork's Avatar
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    Quote Originally Posted by wizbang View Post
    I totally agree and do understand your thoughts and great points !

    Thank You, we'll get it on the water and gofrom there !

    Thanks again, Wiz
    Whos boat Brian?

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