Jetaway Required at speed?
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Jetaway Required at speed?

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    Just Me snoc653's Avatar
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    Default Jetaway Required at speed?

    Since the jetaway doesn't fit my Jacuzzi pump, my next question is at what speed do you need a jetaway to be safe? The sleekcraft is a shallow V and it runs a Jacuzzi WJ pump with a Jacuzzi B impeller. I've been told this would equate to a Berkly A impeller. With between 550 to 650 HP and a motor that will turn 6500 easily will I be reaching speeds where if i let off the motor quickly or have something break a jetaway will be needed?

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    Senior Member Boat 405's Avatar
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    Quote Originally Posted by snoc653 View Post
    Since the jetaway doesn't fit my Jacuzzi pump, my next question is at what speed do you need a jetaway to be safe? The sleekcraft is a shallow V and it runs a Jacuzzi WJ pump with a Jacuzzi B impeller. I've been told this would equate to a Berkly A impeller. With between 550 to 650 HP and a motor that will turn 6500 easily will I be reaching speeds where if i let off the motor quickly or have something break a jetaway will be needed?
    with around 600hp you will be fine without the jetaway, unless you do a lot of running on the trailer. save your money. realistically a jet a way is nice feature to run the boat on the trailer.
    Last edited by Boat 405; 06-24-2008 at 08:59 PM.

  4. #3
    Senior Member Pattymelt18's Avatar
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    jetaways are never required no speed can can ever settle this debate.

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    Senior Member fleetimus's Avatar
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    Nobody has ever said it is needed, unless you race. It works and has definite advantages. Lose a motor at 70 plus mph and then wish you had one. What price is safety and piece of mind Plus, the advantage of running on the trailer

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    jetboataholic HawaiianJet's Avatar
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    Quote Originally Posted by fleetimus View Post
    Nobody has ever said it is needed, unless you race. It works and has definite advantages. Lose a motor at 70 plus mph and then wish you had one. What price is safety and piece of mindPlus, the advantage of running on the trailer
    I would love to have one for that very reason, but I don't have that kind of money to throw around.
    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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    Resident Ford Nut Sleeper CP's Avatar
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    As far as the saftey aspect goes, it all depends on your boat. I can side-step the throttle in the CP at 90+ and the boat just sits down nice and easy. The engine produces North of 800hp. The engine power isn't as much of an issue as to how the boat behaves on shut down. Just my .02

    Sleeper CP

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    Default jet away

    Each boat is different. My 21' Daytona has two long straight sponsons that help it shut down straight. Any type of V hull that would tend to set down one side first would be a bigger risk.

    If your looking for the best safety devise, use a pop-off valve. Better in relieving pressure than the jetaway. some use both.

    Jerry

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    Just Me snoc653's Avatar
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    Quote Originally Posted by billet racing View Post
    Each boat is different. My 21' Daytona has two long straight sponsons that help it shut down straight. Any type of V hull that would tend to set down one side first would be a bigger risk.

    If your looking for the best safety devise, use a pop-off valve. Better in relieving pressure than the jetaway. some use both.

    Jerry
    Since i'd either have to buy a jetaway and have it remachined for the Jacuzzi or add the energizer kit first, I'll look into just adding a popoff valve when the boat starts reaching more speed. I think I'll also take it out and start making some passes starting from slower to faster, then lift and see how it handles.

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    Senior Member Boat 405's Avatar
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    Quote Originally Posted by snoc653 View Post
    Since i'd either have to buy a jetaway and have it remachined for the Jacuzzi or add the energizer kit first, I'll look into just adding a popoff valve when the boat starts reaching more speed. I think I'll also take it out and start making some passes starting from slower to faster, then lift and see how it handles.
    the popoff is not a bolt on deal, you must machine the hand hole on the suction housing.

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    Glendale Arizona Squirtcha?'s Avatar
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    Total agreement with the following statement. Spend you hard earned bucks on something else. I doubt that you would need either a popoff or jetaway unless you're running a ton of shoe, or a real aggressive loader, or both. There are guys on here running between 90 and 100 mph with semi-v's and no jetaway or popoff.

    Quote Originally Posted by widowmaker View Post
    with around 600hp you will be fine without the jetaway, unless you do a lot of running on the trailer. save your money. realistically a jet a way is nice feature to run the boat on the trailer.
    Last edited by Squirtcha?; 06-25-2008 at 10:14 AM.

  13. #11
    Senior Member NiceGuyEddie's Avatar
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    Make a hard pass and let off the throttle. If the shut down is sketchy you might want one. How about some specs on your ride?

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    "That Guy" floatn turd's Avatar
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    I have some some questions, I have a 18ft tunnel (jet) with all the crap that that is in the last post. it shut down @ MPH and hooked pretty bad. I'm not i don't have the $ to pit a jet away, so whats a pop-off? and whats involved in installing it and what kind of money are we talk'n?
    lastly, whats wrong with running the boat on the trailer for 5 or 6 min?
    does it do something real bad?
    thanks ...

  15. #13
    Just Me snoc653's Avatar
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    Quote Originally Posted by rIVERtRASH View Post
    Make a hard pass and let off the throttle. If the shut down is sketchy you might want one. How about some specs on your ride?
    It's just an ol 19' 77 sleekcraft (definately nothing to look at). I bought it to just throw it on the water with minimum fuss, but due to the floods and not being able to get it on the water, the mod bug bit me. The heads are now at the machine shop to be ported and refreshened up. There is a tunnel ram heading this way. And if my machinest mentions it just one more time, there will be a stroker kit going in the bottom of the 440 in it. Man these floods get expensive when you have a boat sitting around not being used. I can tell this one will turn out like some of my cars. Nothing to look at, but it will run the way I want to when I'm done with it. And maybe it will get wet yet this year. I hear they boat as late as NYD out west.

  16. #14
    Senior Member H20MOFO's Avatar
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    Running your jet dry is hard on the impellar/wear ring. If the hose is on it's better but still not as good as being submerged.
    Another Hot Boat refugee

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