porpusing issue
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porpusing issue

  1. #1
    Senior Member wpmxwb's Avatar
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    Default porpusing issue

    its a 78 southwind with about a 550 horse bbc and a set back berkeley jet. the boat porpuses constantly and it runs really wet, im thinking its and issue with my shoe and ride plat setup just not sure exactly what. i put a 6' straight edge on the bottom and there is no hook or rocker.

    specs on the pump are

    detailed stainless AA and bowl
    berkeley droop no wedge,
    berkeley nozzle w/3" reducer,
    shoe is 1/8" below keel and 6* back cut,
    ride plate is 22" and 2* up from keel,
    loader is 1/2" below loader and keel,
    intake opening is 13 7/8"

    any help is greatly appreciated.
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  3. #2
    Senior Member Fonz69's Avatar
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    Default

    time for a place diverter my friend

  4. #3
    Senior Member sleekvino's Avatar
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    Quote Originally Posted by Fonz69 View Post
    time for a place diverter my friend
    what he said!!
    PORNO RACING INC WHERE ITS "HARD" TO WIN

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    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by wpmxwb View Post
    its a 78 southwind with about a 550 horse bbc and a set back berkeley jet. the boat porpuses constantly and it runs really wet, im thinking its and issue with my shoe and ride plat setup just not sure exactly what. i put a 6' straight edge on the bottom and there is no hook or rocker.

    specs on the pump are

    detailed stainless AA and bowl
    berkeley droop no wedge,
    berkeley nozzle w/3" reducer,
    shoe is 1/8" below keel and 6* back cut,
    ride plate is 22" and 2* up from keel,
    loader is 1/2" below loader and keel,
    intake opening is 13 7/8"

    any help is greatly appreciated.
    Curious was this boat originally set up for more HP ?

  7. #5
    Senior Member ICECREAMAN's Avatar
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    Have you tried it with out the droop?

  8. #6
    Senior Member wpmxwb's Avatar
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    Quote Originally Posted by Fonz69 View Post
    time for a place diverter my friend
    i cant imagine a diverter being my only problem. ive had boats with similar hardware just way different measurments and i could set the diverter where ever i wanted and it would never porpoise

    Quote Originally Posted by jetboatperformance View Post
    Curious was this boat originally set up for more HP ?
    yes i it origonally had a bown motor in it.

  9. #7
    Senior Member wpmxwb's Avatar
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    Quote Originally Posted by ICECREAMAN View Post
    Have you tried it with out the droop?
    i have not, i have a stock snoot i can try tho

  10. #8
    Senior Member HBInHeat's Avatar
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    Quote Originally Posted by wpmxwb:1686697
    its a 78 southwind with about a 550 horse bbc and a set back berkeley jet. the boat porpuses constantly and it runs really wet, im thinking its and issue with my shoe and ride plat setup just not sure exactly what. i put a 6' straight edge on the bottom and there is no hook or rocker.

    specs on the pump are

    detailed stainless AA and bowl
    berkeley droop no wedge,
    berkeley nozzle w/3" reducer,
    shoe is 1/8" below keel and 6* back cut,
    ride plate is 22" and 2* up from keel,
    loader is 1/2" below loader and keel,
    intake opening is 13 7/8"

    any help is greatly appreciated.
    This setup.sounds way off for an 18. Y are.u running a 6° back cut shoe? Thats way to much lift on a boat that allready has a ton of lift naturally. Also if somone took the rocker outa the hull that could also be the reason its porpusing. Loader 1/2 inch below keel doesnt sound right either. Got any pics?

  11. #9
    Senior Member wpmxwb's Avatar
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    Quote Originally Posted by HBInHeat View Post
    This setup.sounds way off for an 18. Y are.u running a 6° back cut shoe? Thats way to much lift on a boat that allready has a ton of lift naturally. Also if somone took the rocker outa the hull that could also be the reason its porpusing. Loader 1/2 inch below keel doesnt sound right either. Got any pics?

    its how i bought the boat, i was thinking of making a flat shoe with the same depth and giving that a shot. the bottom has been worked on by the origonal owner and looks to be speed coated. i dont have pics of that right now but i can take some when i get home tonight
    Last edited by wpmxwb; 08-02-2012 at 08:11 AM.

  12. #10
    Senior Member Futs's Avatar
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    . The droop has 7* up nozzel built into it, so minus the 4* for the intake (if thats where its set) and you now have 3* up. A back cut shoe is all wrong for that hull (especially 6*). Try a 2* tapper or even a flat and set it even with keel. Ride plate sounds about right, but thats neither here nor there at this point. Trim the stingers on the loader even with keel to start with. Also, i would start with a 3.125 nozzle insert.
    Im not to crazy about a set back on these hulls, but by the pics it looks as if it might be in the stock location or 2" set back at most.
    A place diverter is your friend with this hull. Like said before, these hull have a ton of lift by design, so you need to start on the conservitive side of things and work forward.
    Also, these hulls need the rocker in them IMO, but what do i know....
    Last edited by Futs; 08-02-2012 at 08:28 AM.

  13. #11
    Cas
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    Quote Originally Posted by Futs View Post
    . The droop has 7* up nozzel built into it, so minus the 4* for the intake (if thats where its set) and you now have 3* up. A back cut shoe is all wrong for that hull (especially 6*). Try a 2* tapper or even a flat and set it even with keel. Ride plate sounds about right, but thats neither here nor there at this point. Trim the stingers on the loader even with keel to start with. Also, i would start with a 3.125 nozzle insert.
    Im not to crazy about a set back on these hulls, but by the pics it looks as if it might be in the stock location or 2" set back at most.
    A place diverter is your friend with this hull. Like said before, these hull have a ton of lift by design, so you need to start on the conservitive side of things and work forward.
    Also, these hulls need the rocker in them IMO, but what do i know....
    On top of all that, try a 2º wedge with it going down.....just trimming the loader will probably do wonders

  14. #12
    Senior Member Fonz69's Avatar
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    Not having a diverter is not the problem but its the solution...
    I could not image having a jet without one...unless it was a race only boat

  15. #13
    Senior Member Futs's Avatar
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    Quote Originally Posted by Fonz69 View Post
    Not having a diverter is not the problem but its the solution...
    I could not image having a jet without one...unless it was a race only boat
    I would bet alot of money that a diverter will not fix this problem by its self if all the info is accurate.

  16. #14
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    Replace the nozzle first. Then cut the loader up. Thats where I would start. Its the easyest. Then maybe the wedge. Then make the shoe. Because its easy. Then the tuning really starts. Oh and get a pump presure gauge. Be safe, schick
    Half the people in the world are below average.

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