What shu should I run???
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What shu should I run???

  1. #1
    Senior Member CHEVY JET's Avatar
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    Default What shu should I run???

    I have an 84 marlen renagede tunnel, It has a berk pump with a ss a/b impeller and a DPS inducer. The loader has been cut back so all four mounting holes are open. The shu has been angle cut so the round bitting edge is 5/8" and the back, just befor the rideplate is 1/2". About 2 degs. the motor is turning 5800rpm.

    My problem is, when I floor it it takes off and runs hard, then throws the nose down and scares the shit out of me. The rideplate is up (toward the pump) 2 degs. I have a manuel place diverter on it, all the way up its better, but oviously im loosing alot with the pd up.

    Should I put a 5/8 strait shu in it, or a 3/4 back cut one in it. I have two new 1" blanks that I am going to cut to fit and drill to my intake pattern. I dont want to much in it and flip it over, or spin it out on shut down. Has anyone ever messed with one of these boats? LOL I know Its the same as a mantra tunnel.

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    Senior Member Futs's Avatar
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    try putting the ride plate up another 2* and keep going up till you find the sweet spot if its helping. You have a tapered shoe in it. Doesnt sound like its rocking back on the plate,so that would be the first thing i adjusted and tried.

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    Senior Member CHEVY JET's Avatar
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    It has the tapered shoe in it, but the problem I have then, is it is hitting the bottom of the boat, and bending the rideplate. Should I grind the bottom of the boat on an angle, or put a thicker shoe in it and get it off the bottom a little more.

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    Boat Nut sleekcrafter's Avatar
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    Donny.. grinding the bottom of the boat is needed, for clearance of the plate. In some cases it's needed to to build up the inside, for more meat, this requires pulling the intake. Ususally the keels are thick on the jet boats. Stop by Saturday morning, if you have time.
    Upper Midwest Power Boat Association
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    Default shoe

    Do you run a pressure gauge on the pump? I t sounds like your going into severe over charge. I have to assume that the boat is fairly light and the over charge can be really extreme in a light boat. What is your mouth opening, nozzle size, shoe depth in relationship to the keel.

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    Senior Member 787chuck's Avatar
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    Quote Originally Posted by greg shoemaker View Post
    Do you run a pressure gauge on the pump? I t sounds like your going into severe over charge. I have to assume that the boat is fairly light and the over charge can be really extreme in a light boat. What is your mouth opening, nozzle size, shoe depth in relationship to the keel.
    x2

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    Senior Member CHEVY JET's Avatar
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    Even with the pd up, it doesnt hang the nose upthe shoe is even to 1/8 up, the problem it whare to mesure from, the keel has a v down the middle of it.

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    Senior Member CHEVY JET's Avatar
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    The top of the keel next to the v, to the shoe is 1/8 up(the shoe is higher) and goes even on the as you go down

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    Senior Member CHEVY JET's Avatar
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    I just relooked at it when I got home. The keel is rounded, and it comes to a radioused V in the middle. The shoe is 1/8 up towards the bottom of the boat, from the top of the V in the keel, with the strait edge on the keel. The loader is even with the intake with no shoe in the boat. The intake is also 1/8 up into the boat without the shoe installed. So do I put the bubble level on the stringers, or the bottom of the boat to make it even to see what angle the intake is on?? I have no problem taking the intake out of the boat, and resetting it, What degree should the intake be at??

  12. #10
    Senior Member CHEVY JET's Avatar
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    I just made some spacers for the shoe, I have four .040 and one 1/8. I was thinking about putting two .040's in first. that shouldnt cause to much of a problem on shut down should it?? Or should I just go with babby steps first and only go with one at a time?

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