gear box
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gear box

  1. #1
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    Default gear box

    I see where Hydro's and flats run two speed tranny's. Why don't Jets. Flats use a prop and a jet is just an in closed prop right?.

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  3. #2
    TSUNAMI BOATS SUCK :( Sis Q Kid's Avatar
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    Wow!

  4. #3
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    Wow, really? I don't no that much about Jets and thought this was a valid question. so since you seem to know so much, why don't you show me just how much you know Sister kid. I wasn't implying that someone put a power glide in a Jet but I've seen Linko? two speeds in Flats and Hydros. why not in a jet so as not to have to run the motor up to 7000 to 7500 rpm and make the motor live a little longer?

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  6. #4
    Senior Member Boat 405's Avatar
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    Quote Originally Posted by SubZero View Post
    Wow, really? I don't no that much about Jets and thought this was a valid question. so since you seem to know so much, why don't you show me just how much you know Sister kid. I wasn't implying that someone put a power glide in a Jet but I've seen Linko? two speeds in Flats and Hydros. why not in a jet so as not to have to run the motor up to 7000 to 7500 rpm and make the motor live a little longer?
    The ones used in jets are meant to put the engine in it's power band. Pro gas motors like to spin anywhere from 8000-9500 rpm. An impeller cut to spin that high is typically ineffecient. That why the gearbox spin the pump slower than the motor. Also the ones in jets that I've seen are not shiftable. They are a fixed ratio. Just run a larger impeller to spin the pump at the rpm the motor makes the most power.

    And yes the pump is much more involved than an enclosed propeller. A jet will spin the same rpm at the beginning of a track as it will the end, providing it is appropriately loaded. A vdrive or hydro will increase rpm as it goes down the track.
    Last edited by Boat 405; 05-14-2014 at 12:29 PM.
    Boat 405.

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