JC Split Bowl???
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JC Split Bowl???

  1. #1
    jetboataholic HawaiianJet's Avatar
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    Question JC Split Bowl???

    This has baffled me for a while now. How is a Berkeley JC bowl converted to a split bowl? Is it just cut off, until you get the right diameter for the adapters? I would think that this would look really funny. Are there any advantages to doing it, over buying a JG or JB bowl? Can I see some pictures of a converted bowl? And about how much does it cost to have it done, and who does it?

    Thanks.

    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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  3. #2
    northern member Canuc's Avatar
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    was wondering the same thing myself . there was a picture of one posted on here back a quite a while ago . i'm thinking you have to weld a ring on first then machine the flange as there just isn't the material in the original casting.

  4. #3
    Cas
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    Angry American Cas's Avatar
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    c bowl



    converted c bowl


    the bowl is cut and a new flange is welded on. I believe the one pictured above was done by Jim at e-performance marine.
    http://www.e-performancemarine.com/

    The c bowl is considered to be a better bowl due to the vanes being longer than the B or G bowls.

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    Boat Nut sleekcrafter's Avatar
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    At the time MPD was the place to have the C to G conversions done, it's a lot of work to do the process correctly, so it's somewhat expensive. We had one done about 4 years ago by MPD, cost was in the $450 range, don't remember if that was just for the bowl work or other work done. Today the prices of jet components are relatively cheap compaired to just ten years ago. Today a new style bowl with longer vanes can be bought for just a little more money.
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  7. #5
    jetboataholic HawaiianJet's Avatar
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    Question

    Quote Originally Posted by sleekcrafter View Post
    At the time MPD was the place to have the C to G conversions done, it's a lot of work to do the process correctly, so it's somewhat expensive. We had one done about 4 years ago by MPD, cost was in the $450 range, don't remember if that was just for the bowl work or other work done. Today the prices of jet components are relatively cheap compaired to just ten years ago. Today a new style bowl with longer vanes can be bought for just a little more money.
    What are these newer style bowls? Are you talking about bowls like Aggressor's or AT's? Like this bad ass Aggressor 11 vane.



    Thanks.

    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.

  8. #6
    Boat Nut sleekcrafter's Avatar
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    Not just Aggressor, Dominator, and American Turbine as well.
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    DRAG BOAT RACING UMPBA #926


  9. #7
    jetboataholic HawaiianJet's Avatar
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    Quote Originally Posted by sleekcrafter View Post
    Not just Aggressor, Dominator, and American Turbine as well.
    Alright, the only one I forgot to mention was Dominator (and they're made by AT).

    But, are there any advantages to getting the conversion, over buying a new bowl.

    Thanks.
    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.

  10. #8
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    I think you're splitting hairs in comparing a converted JC to a JG or even a newer AT, etc., etc... I would think for the average non-race jet boat the differences would be minimal.

    Now we just need an informed person to tell me why I'm wrong.

  11. #9
    jetboataholic HawaiianJet's Avatar
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    Quote Originally Posted by hotrod56cars View Post
    I think you're splitting hairs in comparing a converted JC to a JG or even a newer AT, etc., etc... I would think for the average non-race jet boat the differences would be minimal.

    Now we just need an informed person to tell me why I'm wrong.
    I'm just trying to figure out which bowl would give me the most thrust with my low horsepower, low rpm engine. And having the ability to add and remove hardware, like a split bowl, would be nice too. I need all the help I can get with my small motor. I'm just glad the boat came with an impeller that works well on low rpm engines.

    Thanks.

    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.

  12. #10
    Boat Nut sleekcrafter's Avatar
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    Quote Originally Posted by HawaiianJet View Post
    I'm just trying to figure out which bowl would give me the most thrust with my low horsepower, low rpm engine. And having the ability to add and remove hardware, like a split bowl, would be nice too. I need all the help I can get with my small motor. I'm just glad the boat came with an impeller that works well on low rpm engines.

    Thanks.


    If you want the biggest bang for the buck, on your pump...Get your impeller race prepped and a new matched wear ring. After that you will need more HP
    Upper Midwest Power Boat Association
    DRAG BOAT RACING UMPBA #926


  13. #11
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    Quote Originally Posted by HawaiianJet View Post
    What are these newer style bowls? Are you talking about bowls like Aggressor's or AT's? Like this bad ass Aggressor 11 vane.
    Just curious. Why do you say that bowl is bad ass??

    Cs

  14. #12
    jetboataholic HawaiianJet's Avatar
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    Exclamation

    Quote Originally Posted by sleekcrafter View Post
    If you want the biggest bang for the buck, on your pump...Get your impeller race prepped and a new matched wear ring. After that you will need more HP
    My impeller looks like this (see images below), it is an aluminum AB cut of an unknown (to me) make, it started out as an A2 based on the stamping on the back. It came with the pump when it was sent off to be rebuilt (before I bought the boat) and blueprinted. It also has a bronze shouldered wear ring that came with the impeller (I guess) from whoever rebuilt the pump the first time. (I tore the pump down and rebuilt it when I got it, but it had only been run a couple times before the boat was sold, I just replaced the gaskets and speed coated all the interior surfaces of the pump) Is that a race prepped impeller? Cause I really have no idea.





    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.

  15. #13
    I'm No Expert Shaun's Avatar
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    There was alot of talk about this on hotboat, i had my bowl converted by MPD. Think it ran me 400 bucks and he only does certain times of the year when he's not busy. Go onto hotboat and do a search.

  16. #14
    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by HawaiianJet View Post
    My impeller looks like this (see images below), it is an aluminum AB cut of an unknown (to me) make, it started out as an A2 based on the stamping on the back. It came with the pump when it was sent off to be rebuilt (before I bought the boat) and blueprinted. It also has a bronze shouldered wear ring that came with the impeller (I guess) from whoever rebuilt the pump the first time. (I tore the pump down and rebuilt it when I got it, but it had only been run a couple times before the boat was sold, I just replaced the gaskets and speed coated all the interior surfaces of the pump) Is that a race prepped impeller? Cause I really have no idea.





    somebody's detailed that impellor, looks nice.

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