First Restore
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First Restore

  1. #1
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    Question First Restore

    I have a 1979 16ft Cobra Jet with a berkeley JE pump. The jet is fitted with a diverter. I was wondering if that is a good hull design and good model pump. The boat had a 396 that was junk so I'm starting to build a blown 454 for it. The blower is off a 6v-92 detroit. Its being upfitted by a company in Texas. The pump as an aluminum impeller now so I believe I will need to buy a stainless steel one do to the fact that I will be over 500hp.
    So seeing that I am doing the engine and impeller do I buy the impellor and build the motor to match or build the motor and buy the impeller to match. The 396 had aluminum water cooled manifolds on it with 3" pipe going up and over the transum. I think on the 454 I should go to headers for better breathing.
    Any input would be greatly appreciated thanks

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    jetboataholic HawaiianJet's Avatar
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    Talking

    Pictures would be great!
    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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    Quote Originally Posted by HawaiianJet View Post
    Pictures would be great!
    I'm just getting started so I will get some pics and post them.

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    Swollen Member SinisterGrin's Avatar
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    Quote Originally Posted by SinisterGrin View Post
    Are the pics for those of you that can't read!

    Just kidding.
    They will be coming soon.

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    mo balls than $cents$ IMPATIENT 1's Avatar
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    WELCOME TO THE SITE!

    match the impellor to the peak hp of the motor. 12je pumps are tuff to keep fed at higher mph, so you're gonna need to buy a bolt on shoe/rideplate kit to keep it fed. if your motor will make say 750hp at 6500, run a impellor that'll allow the motor to reach that rpm level. i've built and ran a few 12je's that were fast, i stuck 900hp to my 12je in the taylor sj i had and it took a berk a cut to keep it held to 6700-6800rpms you're gonna need a a-cut i'd bet for starters. if its too much impellor, you can cut it down, but it takes a biggg hp motor to turn a aa cut over 6000rpms.

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    Quote Originally Posted by IMPATIENT 1 View Post
    WELCOME TO THE SITE!

    match the impellor to the peak hp of the motor. 12je pumps are tuff to keep fed at higher mph, so you're gonna need to buy a bolt on shoe/rideplate kit to keep it fed. if your motor will make say 750hp at 6500, run a impellor that'll allow the motor to reach that rpm level. i've built and ran a few 12je's that were fast, i stuck 900hp to my 12je in the taylor sj i had and it took a berk a cut to keep it held to 6700-6800rpms you're gonna need a a-cut i'd bet for starters. if its too much impellor, you can cut it down, but it takes a biggg hp motor to turn a aa cut over 6000rpms.

    Thanks, its hard to find anyone in appleton wisonsin that knows anything about jetboats. I'll ask about a jetboat and they will say do you mean a jet ski and then I just hang up the phone.
    The best guesstimits on the engine right now is around 800 to 850 hp. I've been told to start with a aa cut and go from there. The transum and runners for the engine where just redone before I got the boat.
    I'm new to jets so I'm guessing that by shoe/rideplate you are refering to the scope that bolts in place of the weed guard on the intake.
    I've looked a alot of the pics on this site and others and I always see the tall intakes but not very many blown engines. Is there a reason for this or is building a blown engine not a good fit for a jet boat.

    thanks again its nice to be able to have some of my questions answered

  10. #8
    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by Problem Child View Post
    Thanks, its hard to find anyone in appleton wisonsin that knows anything about jetboats. I'll ask about a jetboat and they will say do you mean a jet ski and then I just hang up the phone.
    The best guesstimits on the engine right now is around 800 to 850 hp. I've been told to start with a aa cut and go from there. The transum and runners for the engine where just redone before I got the boat.
    I'm new to jets so I'm guessing that by shoe/rideplate you are refering to the scope that bolts in place of the weed guard on the intake.
    I've looked a alot of the pics on this site and others and I always see the tall intakes but not very many blown engines. Is there a reason for this or is building a blown engine not a good fit for a jet boat.

    thanks again its nice to be able to have some of my questions answered
    what bolts in place of the stock rock grate is called a loader, you're gonna need a proloader or the ss, depends on where you buy it.

    this is the shoe/ride plate kits i've used in the past with good luck. keep in mind its a universal kit and there's alot of work to get it tuned right across all the different brand of hulls.

    http://www.hi-techperformance.com/im..._Shoe_2315.jpg

    http://www.hi-techperformance.com/images/3e-sho~1.jpg

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    Just Me snoc653's Avatar
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    did that boat originally have an olds motor in it? If it did, i think the guy selling it said the pump had just been rebuilt. Not that i've been looking for boats around the midwest

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    mo balls than $cents$ IMPATIENT 1's Avatar
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    here's 1 of the boats i've had a 12je( the blue and white sj). i could flat foot that bbf and hit the nitrous before i ever broke over and it'd never slip. i fed that boat ALOT of shoe(bout 1/4 below keel, loader at keel, ride plate at 2-3*) to get it to pull hard from a deadstop like it did.
    http://s55.photobucket.com/albums/g1...visracempg.flv

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    Senior Member Oldsquirt's Avatar
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    Problem Child, if that Cobra Jet is anything at all like the other common 16 foot jet hulls, with a "deep-entry bow",it is not a good hull to be putting big power into. Please post some pics of the hull, particularly a side view on trailer that shows the bow and the bottom shape. The last guy who had a 16 foot jet project that he dumped a hi-po small block into(against advice) found out quickly it was not a good idea.

    EDIT: Found a couple of pics HERE. If the pics at top are what you have, you have the hull design I was referring to.
    Last edited by Oldsquirt; 06-11-2008 at 08:00 PM.

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    Quote Originally Posted by snoc653 View Post
    did that boat originally have an olds motor in it? If it did, i think the guy selling it said the pump had just been rebuilt. Not that i've been looking for boats around the midwest
    No it had 396 bb chevy in it. I got the boat about 4 years ago for $200.00 I painted it for my buddy and then he lost interest in it so he gave it to me for the cost of the paint, which I had purchesed for well $200, but now I have to sand the base clear off so I can gell coat it. from the rub rail down and then I'm going to do the upper in base clear and right know I have about four colors in the design I can up with. The dash was full of holes from gauges, a radio and switches. So I had a piece of brushed stainless laser cut to fit over the dash and I will mountthe gauges in a row just under the dash or in a cluster on top of the dash not sure which yet. I'm having the whole wiring harness made and enclosed in a full breaded wrap from front to back. The engine harnes will be made by the same company and there will be a bulk head connector between the engine a main harness. I hate messy wires.

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    Quote Originally Posted by Oldsquirt View Post
    Problem Child, if that Cobra Jet is anything at all like the other common 16 foot jet hulls, with a "deep-entry bow",it is not a good hull to be putting big power into. Please post some pics of the hull, particularly a side view on trailer that shows the bow and the bottom shape. The last guy who had a 16 foot jet project that he dumped a hi-po small block into(against advice) found out quickly it was not a good idea.

    EDIT: Found a couple of pics HERE. If the pics at top are what you have, you have the hull design I was referring to.
    Well this is good timing to get that info because I'm just starting on it.
    This would have a big block so worse yet.
    That sucks I was hoping that wouldn't be the case but ya the hull design matches the top set of pics. I was starting to wonder why I've never seen that design in pics before.
    So whats the deal with that design. Not strong enough, bad handling?
    With that said I sould start looking for a differnt hull?
    I will still post some pics to verify but that is the design.

    Thanks for the heads up though.

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    "Problem Child" I gave the boat the right name after all

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