More roost!!
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More roost!!

  1. #1
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    Default More roost!!

    I just bought a 77 bahner. Has a 454 with Berkeley pump. It's not a split bowl. It has a hydraulic jetovator right now but I'm looking for more rooster tail. I heard you need a split bowl to add anything else on? Any info is appreciated!!

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    Member Rude Louie's Avatar
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    Why do you want more rooster tail? The higher it is, the more it will hurt performance.

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    Just for looks honestly. The boat runs great don't need to go any faster YET haha

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    Senior Member rogerroost's Avatar
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    why does a high roost hurt performance?

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    I think it helps your top end more lift out of the water but it does affect your handling

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    Renegade jet tunneljet's Avatar
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    Because you lose forward thrust when water is pumped vertically. Kind of like a drag car doing a huge wheelie is slower than one that hooks and carries the tires a little bit.

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    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by 77bbc454 View Post
    I just bought a 77 bahner. Has a 454 with Berkeley pump. It's not a split bowl. It has a hydraulic jetovator right now but I'm looking for more rooster tail. I heard you need a split bowl to add anything else on? Any info is appreciated!!
    Pictures of your current jet trim and install may help here , its not likely you have a hydraulic "jetovater" but rather a Place diverter or ? , True Jetovaters (manufactured by Berkley years ago) were typically Manual handle /cable operated or an electric box activated control... If you wish to have a greater "roost" for whatever reason you desire several changes might accomplish that however those changed would entail a bowl change to allow for the addition of nozzle adaptor wedges etc . In any event Like suggested excessive "up trim" wont really accomplish much, except to salute the crowd Tom

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    Senior Member rogerroost's Avatar
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    so if I want to go faster I should take of my place divertor ,droop ,wedge off . put the jc bowl back on and keep bow nice and wet in the water ? seems like alot of guys are on the wrong path

  11. #9
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    more roost lifts bow but also stuffs ass of boat into water. I have high roost capability and when I lower it from full up I feel the boat go noticeably faster. Like tom said, I use it to salute the crowd, cruising I have it slightly up for fuel consumption and it just feels like it moves more effortlessly
    1990 ultra 21' open bow. 509, American turbine Jet

  12. #10
    tintingsandiego krusn56's Avatar
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    I read Toms post an he isn't suggesting loss of performance with a roost... He states excessive roost would just be for a salute. Every boat has a sweet spot with the help of trim adjustment. Some of the serious boaters have the air compressed place set at 2 spots... take off (down selected spot) an WOT (up selected spot) for best performance.
    Last edited by krusn56; 02-17-2015 at 08:14 AM.
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  13. #11
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    Didn't someone offer a Rooster Booster at one time?...not that I'm a fan of them

  14. #12
    Renegade jet tunneljet's Avatar
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    Quote Originally Posted by rogerroost View Post
    so if I want to go faster I should take of my place divertor ,droop ,wedge off . put the jc bowl back on and keep bow nice and wet in the water ? seems like alot of guys are on the wrong path

    Not at all! Generally being trimmed up just slightly 2'+or- depending on your particular setup is where the boat will run fastest. Trimming past that will generally slow you down, however is very fun for showing off!

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    I'm sorry yes a place diverter! Ya I was told that in order to do anything else for more I would have to change the bowl to a split bowl.

  16. #14
    Senior Member rogerroost's Avatar
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    Quote Originally Posted by Rude Louie View Post
    Why do you want more rooster tail? The higher it is, the more it will hurt performance.
    I'm not suggesting the higher the roost the faster you go. I also wouldn't launch the boat with the roost full up, like a drag car doing a wheel stand
    I do however think that 77bbc would benefit from a split bowl and P.D. and whatever other pieces he decides to try, such as wedge or snoot

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