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  1. #1
    brisyl's Avatar
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    Safe offshore Back air vent mod

    Here's my back air vent mod i been working on,



    Click image for larger version. 

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    This vent box allow to remove the restrictive hoses that hang to low while the hot hair hang on top, it evacuate the hot hair while blocking water from getting in when the ski flip over,

    it is as close as having open vent with no pipe without taking the chance of sunking the ski

    the video show the box when it flip over.
    Before somebody yeld at me, i will clarified a thing! the box is water resistant! and not 100% waterproof!
    The purpose of it, is to slow down the infiltration and allow time to flip back the ski, i'm not trying to build a submarine
    the leakage is very low ( not even 2 liter per 5 min immersion)




    i will do more intensive offshore testing this summer!!

    Dont mind the fit and finish! this is a prototype
    Last edited by brisyl; 05-14-2015 at 08:38 PM.


  2. #2
    Cool

  3. #3
    nicjak's Avatar
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    wow alot of work gone into that would be hard to justify any gains from effort or price tag. i suppose it all comes down to how much you trust yourself as a rider and what you are prepared to do on your ski. i have had the rear tubes removed from my first 250x from back in 2008 i have done it on every ski after that i have owned my ski is insured i ride in the surf to this day i think i ride/jump sensibly enough to trust what i have done. if i ever come off and it flips thats the chance i take. but with all the other airvents in my ski i dont think it would help much. nice work though as long as you are happy thats all that matters here.

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  5. #4
    "just sayin".. jetdave56's Avatar
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    Nice... did you weld that box yourself with the vents?

  6. #5
    Gsmith88's Avatar
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    Pretty slick

  7. #6
    Take the time to smile sirbreaksalot's Avatar
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    Personally I think you have REDUCED the flow rate ofver the standard hose.

    I have been doing the EASY SIMPLE PROVEN SAFE rear air mods that IMPROVES AIR flow by approx 25 % per inlet

    these can be purchased from www.kspeed.com.au http://brisbanekawasaki.com.au/produ...ir-vent-tubes/

    I have been making enlarged FACTORY STYLE fittings that increases the size from Factory 60mm ID upto 76mm ID ( 80mm OD )
    then I just buy so 80mm ID smooth internal finish hose and install as per stock. But you do need to just trim the rear seat base a few mm so they can come threw the black plastic like the OEM units..

    then you have 100% SAFE high flow design that bolts into the STOCK HULL position .

    so when you think about the numbers I can PROMISE you it works EXACTLY the same gains as NO rear tubes , just SAFE

    now consider adding 5 of these like I do on my skis,
    OEM = 4 x 60mm ID vents ( 240mm total )
    NEW STYLE x 5 = 375mm total SAFELY.

    easy HP I tell you, may aswell ride with you seat off all day

    But its always good seeing people try other ideas

    WAz

    P.S what does the video mean to show, because as soon as you push it in further water will flow straight in !!!
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    Last edited by sirbreaksalot; 05-16-2015 at 02:00 AM.

  8. #7
    nicjak's Avatar
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    I think it has an internal flap waz, but you maybe right the weight of the ski may just neutralize it

  9. #8
    brisyl's Avatar
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    Quote Originally Posted by sirbreaksalot View Post
    Personally I think you have REDUCED the flow rate ofver the standard hose.

    I have been doing the EASY SIMPLE PROVEN SAFE rear air mods that IMPROVES AIR flow by approx 25 % per inlet

    these can be purchased from www.kspeed.com.au http://brisbanekawasaki.com.au/produ...ir-vent-tubes/

    I have been making enlarged FACTORY STYLE fittings that increases the size from Factory 60mm ID upto 76mm ID ( 80mm OD )
    then I just buy so 80mm ID smooth internal finish hose and install as per stock. But you do need to just trim the rear seat base a few mm so they can come threw the black plastic like the OEM units..

    then you have 100% SAFE high flow design that bolts into the STOCK HULL position .

    so when you think about the numbers I can PROMISE you it woks EXACTLY the same gains as NO rea tubes , just SAFE

    now consider adding 5 of these like I do on my skis,
    OEM = 4 x 60mm ID vents ( 240mm total )
    NEW STYLE x 5 = 375mm total SAFELY.

    easy HP I tell you, may aswell ride with you seat off all day

    But its always good seeing people try other ideas

    WAz

    P.S what does the video mean to show, because as soon as you push it in further water will flow straight in !!!
    already done that in frontClick image for larger version. 

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    How can it reduce the flow? it is the same size hole with no pipe

  10. #9
    brisyl's Avatar
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    Quote Originally Posted by jetdave56 View Post
    Nice... did you weld that box yourself with the vents?
    yes i did

  11. #10
    brisyl's Avatar
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    Quote Originally Posted by nicjak View Post
    I think it has an internal flap waz, but you maybe right the weight of the ski may just neutralize it
    the more weight you put on it, tighter it will seal, so why the weight of the ski would neutralize it?

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