First Jet Boat, Have Questions
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First Jet Boat, Have Questions

  1. #1
    Senior Member Areyouliving's Avatar
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    Default First Jet Boat, Have Questions

    Well I am the proud new owner of an old boat. 1978 Hallett Mini Cruiser. 19' long, 471 BBF low hours on both the engine and the pump assembly. I'll post some pics up after I can snap a few. There were some that came with the listing but not great. Anyhow being my first jet I have some questions.
    Today I was told that jets are good to go fast short distances. That it puts too much strain on the motor to go long distances at speed. Is this true? Can you not cruise long distances with a jet? Where I live and boat there are lots of times you might cruise 8-10 miles.

    What else should I be aware of?

    Thanks
    Last edited by Areyouliving; 02-22-2011 at 01:57 PM.

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    Senior Member DuaneHTP's Avatar
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    Define crusing. 30-40 mph=no problem. 40-50 some strain. Normlly above that= big strain.
    also depends upon your set up. Lot of variables here. If you like to cruise, a AA Hi-Helix Impeller should work good with that engine.
    Duane HTP

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    Senior Member Areyouliving's Avatar
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    Cruising in my mind is in that 40-50mph range. It currently has an "A" impeller I'm told. Don't really know what that means though. Would a larger oil cooler help? Different impeller?
    Thanks

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    Senior Member Brendellajet's Avatar
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    Jetboat motor is like anything else, if you make it work too hard, it wont last as long as you wanted it to. A bigger impeller will pull your top end rpms down but will genarally give you better cruising speeds with less rpm. Every motor is different- my 548 likes the 3500-4500 range with an AA. How much power is that Ford making and at what rpm?
    "He is a lover, not a fighter. But he's also a fighter, so dont get any ideas."

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    Senior Member Areyouliving's Avatar
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    It hasn't been dyno'ed. According to the PO it was spec'd at 500, but that just seems to be a number people like to throw around. Don't really know if it's true.

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    Senior Member Areyouliving's Avatar
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  9. #7
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    Very sharp looking boat! have fun!

  10. #8
    Senior Member ol guy's Avatar
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    Quote Originally Posted by Areyouliving View Post
    Well I am the proud new owner of an old boat. 1978 Hallett Mini Cruiser. 19' long, 471 BBF low hours on both the engine and the pump assembly. I'll post some pics up after I can snap a few. There were some that came with the listing but not great. Anyhow being my first jet I have some questions.
    Today I was told that jets are good to go fast short distances. That it puts too much strain on the motor to go long distances at speed. Is this true? Can you not cruise long distances with a jet? Where I live and boat there are lots of times you might cruise 8-10 miles.

    What else should I be aware of?

    Thanks
    Get the boat on the water and by the seat of your'e pants you will know where the boat is at a comfortable cruise speed. Normally for that style boat a cruise speed is 3200-3500 RPM. Great ol boat and looks good!!!! Also estimated cruise speed can be very decieving on the water. Does it have a diverter or trim tabs ? If so, trim to a easy ride and go with it. M

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    Senior Member Areyouliving's Avatar
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    It has a jetovator. No tabs though. Thanks for the compliments. I'm excited to get out and run it.

  12. #10
    tintingsandiego krusn56's Avatar
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    Nice boat and congrats....did the prior owner have a big wife? The pass seat is mighty big. Shoot a pic of the back side. Like to see if you have a jetovator or diverter. You can throw on a kool custom knob...like a beer handle on that forward/reverse since its missing. If you decide to run a better log exhaust, I have three sets of through bolt logs which are the best for ford.
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    Senior Member sleekcraft137's Avatar
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    Quote Originally Posted by krusn56 View Post
    Nice boat and congrats....did the prior owner have a big wife? The pass seat is mighty big. Shoot a pic of the back side. Like to see if you have a jetovator or diverter. You can throw on a kool custom knob...like a beer handle on that forward/reverse since its missing. If you decide to run a better log exhaust, I have three sets of through bolt logs which are the best for ford.
    And the new project begins!

  14. #12
    Senior Member ol guy's Avatar
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    Quote Originally Posted by Areyouliving View Post
    It has a jetovator. No tabs though. Thanks for the compliments. I'm excited to get out and run it.
    Until you get it wet you will not know how happy it is at a cruise that works for your'e idea of a cruise. By the way, looks kike a pair of 660 carbs on that Ford and they are good for racing but dont due the cruise in a pocket friendly way. You might want to adapt the carbs to an all around "friendly on the wallet" tune! M

  15. #13
    no need 2 fake it. 84Condor's Avatar
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    damn good lookin' boat! i would agree with ol guy, those carbs might be a little expensive on fuel for cruising! looks good though man!
    "i'm into snatchin' kisses... and vice-versa!" haha

  16. #14
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    That is a beautiful boat, if you want to cruse and still play- I would go with a holly 850 dp on a airgap manifold, but mostly go with msd ingition,you would love it....

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