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Excessive spray

Discussion in 'Technical Stuff' started by K C, Dec 1, 2018.

  1. K C

    K C Member

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    i have what seems like excessive spray at the rear of my SX21. I have a 115 Yamaha. I notice the engine shroud gets wet which I read can be trouble if water gets in the air intake. Any ideas?
     
  2. SEMPERFI8387

    SEMPERFI8387 Moderator

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    How much spray? These things can run in the rain so I doubt you have a need to worry. Can you get a video?
     
  3. K C

    K C Member

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    I do. But there is some problem uploading it. It may be too big.
     
  4. Vikingstaff

    Vikingstaff Well-Known Member

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    If you upload your video to YouTube, you can drop a YouTube link into a post. I’ve done that once or twice to get a video posted in the forums.
     
  5. kaydano

    kaydano Well-Known Member

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    Express hull?

    Let me know how you fix it. Been gnawing on that one for years...
     
  6. K C

    K C Member

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  7. kaydano

    kaydano Well-Known Member

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    Mine is the same. That's how the Express is. But, you might try adjusting the steering cables and fuel line so they are not directly in the spray. That may help some.

    Short of welding or bolting on aluminum water guides or wings of some sort, we will have to deal with the spray. Be glad you are not in a muddy lake with a black motor like me. Water spots are a nightmare.

    I've thought about drilling some holes and bolting on some aluminum extensions to tame the spray so the motor cowl doesn't get wet, but haven't done it yet. Something about drilling holes in a boat...
     
    Last edited: Dec 2, 2018
    Michiman likes this.
  8. K C

    K C Member

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    Thanks for taking a look at it. My last (and first) barge was a 20’ Express with a 50 hp merc. It didn’t go fast enough to produce much spray. So when I saw this one I figured something was wrong. And I think even if it IS common it ain’t right. Spec calls for installing motor “ventilation plate height” whatever that is. I’ll be taking it in for service soon and will have it checked.
     
  9. kaydano

    kaydano Well-Known Member

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    None of the spray has anything to do with the motor or its mounting height. It has to do with the short center toon and the water coming off it.
     
  10. K C

    K C Member

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    You have looked into it pretty well evidently. I appreciate your input. Seems to be just poor engineering. I don’t like it.
     
    Michiman likes this.
  11. kaydano

    kaydano Well-Known Member

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    I agree. Design could be improved. And I don't like it either.
     
    lakeliving likes this.
  12. K C

    K C Member

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    They may have found the answer. They installed a 115FXB which is an extra long shaft. It’s 5” to long. They are replacing it with an LB. hopefully this will do it. I’ll let you know. Someday. I have another break in to do.....
     
  13. 1trotter

    1trotter Well-Known Member

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    I used to have a gcw with a 200 and the spray was similar.
     
  14. K C

    K C Member

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    Thanks. I’m pretty much a rookie barge owner. Guess I don’t know what to expect. Performance is well under the yamaha charts for this rig. Unloaded it does 27 gps. Chart showed considerably higher mph with my prop. I expect that to improve some with the proper shaft length. Hopefully spray will too. I’ll follow up when I know.
     
    1trotter likes this.
  15. 1trotter

    1trotter Well-Known Member

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    What is your wide open throttle rpm?
     
  16. K C

    K C Member

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    6000 rpm on the console guage. Prop is Solas 13p 13 3/4” polished stainless stell. I’m guessing on the 13 3/4”. Pretty sure that’s right though.
     
  17. 1trotter

    1trotter Well-Known Member

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    That sounds like the right range .
     
  18. basshawk84

    basshawk84 Well-Known Member

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    I had the same issue with my 22 SSL. I installed a cavitation plate and it helped with the spray along with the boat getting on plane faster.
     
  19. K C

    K C Member

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    Is that like a “whale tail”.
     
  20. basshawk84

    basshawk84 Well-Known Member

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    Same principal, but looks totally different and is made out of stainless steel.
     

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