Bowl Mods
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Bowl Mods

  1. #1
    SLOW MEMBER slowboy's Avatar
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    Default Bowl Mods

    What kind of work can a person do to a stock dominator bowl to make it flow water better? I have heard that work can be done, but also that you can ruin them pretty easy. Has anybody done any work and seen any performance gains?

    I gained 2 miles per hour from just cleaning up my impeller, there must be more there somewhere.

    Thanks, Ryan
    Last edited by slowboy; 08-25-2008 at 05:08 PM. Reason: added to post.
    WORK HARDER, MILLIONS ON WELFARE DEPEND ON YOU.

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  3. #2
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    I have no idea, but I'm working on it. I know that the older style Dominator pumps have a smaller output diameter than the Berkeley's do. Here's a Dominator bowl to Berkeley nozzle adaptor I'm currently enlarging with my custom mill (1 1/2 HP router). I decided to enlarge this piece for practice first before I trash the bowl. I am certain someone will chime in and tell you what I am doing incorrectly!
    I'm just getting started here.


    Casualty number 1 (broken router bit)


    Finished piece. The black line at 11:00 is paint, it's showing a gouge that my "mill" made. The rest of the painted area is the registry for the Berkeley style nozzle which I left untouched.


    Next stop, the bowl. The painted black line represents how much smaller the Dominator is to the Berkeley.


    I'm just getting started on the bowl. Currently waiting for my "mill" to cool off. LMAO
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  4. #3
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    Quote Originally Posted by hotrod56cars View Post
    ... I am certain someone will chime in and tell you what I am doing incorrectly!...
    Or maybe not.

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  6. #4
    Senior Member LuckyDaze's Avatar
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    You can have it extrude honed. What are you trying to achieve? What MPH are you running now?

    ~Brian

  7. #5
    SLOW MEMBER slowboy's Avatar
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    Quote Originally Posted by LuckyDaze View Post
    You can have it extrude honed. What are you trying to achieve? What MPH are you running now?

    ~Brian
    I am trying to make my boat faster, right now it runs 83 at 5900 rps with a small block chevy.

    I am certain there is a few more miles per hour in this pump setup.

    If somebody knows what I can do to the bowl, and does not want their "race" secrets public, please PM me. I would think a quick port job on the bowl would be worth something, but am unsure what to do with the fins. I thought I heard not to sharpen the blades.

    Ryan
    WORK HARDER, MILLIONS ON WELFARE DEPEND ON YOU.

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    EXPERI-MENTAL carlsonauto's Avatar
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    Quote Originally Posted by slowboy View Post
    I am trying to make my boat faster, right now it runs 83 at 5900 rps with a small block chevy.

    I am certain there is a few more miles per hour in this pump setup.

    If somebody knows what I can do to the bowl, and does not want their "race" secrets public, please PM me. I would think a quick port job on the bowl would be worth something, but am unsure what to do with the fins. I thought I heard not to sharpen the blades.

    Ryan
    BS........... That boat only does 72........

  9. #7
    SLOW MEMBER slowboy's Avatar
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    Quote Originally Posted by carlsonauto View Post
    BS........... That boat only does 72........

    Thats really a funny story, I should share it sometime.
    WORK HARDER, MILLIONS ON WELFARE DEPEND ON YOU.

  10. #8
    Senior Member LuckyDaze's Avatar
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    Aside from having the bowl detailed there isn't much other than having it extrude honed to increase flow.

  11. #9
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    You may destroy your Bowls Head pressure. Its all based on the pressure design @ the wrap which sets the internal Pressure. That Bowl may not like the oversize vacate. Your back end extension may work if you put match up vanes to carry the load all the way out. Good Luck.

  12. #10
    Senior Member H20MOFO's Avatar
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    Pops is that kinda why some boats benefit from a stuffer?????? Not that I'm gonna do it, but what would extrude honing typically run? Maybe hone, and stuffer?? Or am I way off lol.
    Another Hot Boat refugee

  13. #11
    Senior Member H20MOFO's Avatar
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    That's pretty impressive 80's out of a small block. I've never broke 70. Let's see your junk seriously that's cool.
    Another Hot Boat refugee

  14. #12
    SLOW MEMBER slowboy's Avatar
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    I dont have a current picture of the boat, I will try to get one posted with in the next few days after it is back together. I removed the bowl tonight, and am currently grinding the sh*t out of it. I figure, no way to learn but to do it, plus, I had some advice on how to do it. If it does not work, I have another bowl here that is a spare that I will replace it with.

    The boat is a 18 foot mako shark. I cut the top off the boat this spring, and replaced the stingers and floor. Set the pump back to get the hand hole cover outside the boat. Glued everything back together, and redid the bottom. The boat still needs paint.

    Boat has run a best of 83 with 2 guys in the boat and full of fuel, on 91 octane gas, no nitrous.....YET. The engine is a 388ci sbc with a 6-71 dyers blower on it, running around 5 psi at 6k. Boat will always run at least 80 in pretty much any conditions, usually between 81-82.

    Pump is a dominator, set back a bunch, it has a loader, shoe, ride plate, one wedge, a droop and a diverter. The impeller is an aluminum BC that I cut and cleaned up. I am either going to replace the impeller with a bronze, or a hi-helix stainless this winter.

    I have an intercooler sitting here, just need a longer belt and some hoses, probably going to wait untill winter to do it. Then probably either some methanol/water injection, or maybe a hit of nitrous.

    It is way more difficult to make a boat go fast than I had ever thought. But we are getting it there slowly.

    We will have to get my friend Jake to post a picture of his on here. He is running a STOCK sbc with a pair of diesel turbos on e-85 and running upper 70's all day long. He has basically no pump work done, not even a diverter. Now thats cool.

    Later, Ryan
    WORK HARDER, MILLIONS ON WELFARE DEPEND ON YOU.

  15. #13
    Senior Member H20MOFO's Avatar
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    Fwiw I'll put up a pic for ya any time.
    Another Hot Boat refugee

  16. #14
    EXPERI-MENTAL carlsonauto's Avatar
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    Quote Originally Posted by slowboy View Post

    We will have to get my friend Jake to post a picture of his on here. He is running a STOCK sbc with a pair of diesel turbos on e-85 and running upper 70's all day long. He has basically no pump work done, not even a diverter. Now thats cool.

    Later, Ryan

    I will get some pics up sometime in the morning

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