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Thread: Nozzle sizing

  1. #1
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    Nozzle sizing

    Does anyone know or recommend what is the best nozzle size in diameter for all round acceleration/top speed? On a 8100 rpm 260 hp s3 hull?

    What would be the best size nozzle for acceleration 0-60 mph?
    What would be the best size nozzle for top speed?


    And does anyone know how much speed/acceleration change there is from different nozzles? Is it pointless to change them? Can you actually notice the change?


    Thanks in advance!


  2. #2
    2006 Turbo RXP boBO's Avatar
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    there is nothing available for the 260

  3. #3
    Bob 1tommygunner1927's Avatar
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    Any machine shop should be able to mill the stock nozzle to use the Riva reduction rings & set screws........

  4. #4
    2006 Turbo RXP boBO's Avatar
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    You can't

    Quote Originally Posted by 1tommygunner1927 View Post
    Any machine shop should be able to mill the stock nozzle to use the Riva reduction rings & set screws........

  5. #5
    home of the dislexic fingers breon's Avatar
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    in the old days...for lack of a better way to describe it. they used to weld a ring into a stock nozzle. you swapped the whole nozzle...

  6. #6
    Bob 1tommygunner1927's Avatar
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    Quote Originally Posted by boBO View Post
    You can't
    Is the stock nozzle too thin, too short, or both?

    OR, try here:

    http://www.greenhulk.net/forums/sea-...-rs-260-a.html

  7. #7
    2006 Turbo RXP boBO's Avatar
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    too short

  8. #8
    sp_RXP_GR's Avatar
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    A good machine shop can do the job for you...
    there is a rotax racing venturi but you have to use the pump also...
    what i do is: i had an old style 215-255 skat trak 159mm venturi nozzle
    & i weld new fitings...now it fits to both 255 & 260 models...but you have to
    use an old style steering nozzle also.i used a skat trak also with rings...now the best
    overall performace i had with 84-85 ring...
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  9. #9
    Bob 1tommygunner1927's Avatar
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    Quote Originally Posted by sp_RXP_GR View Post
    A good machine shop can do the job for you...
    there is a rotax racing venturi but you have to use the pump also...
    what i do is: i had an old style 215-255 skat trak 159mm venturi nozzle
    & i weld new fitings...now it fits to both 255 & 260 models...but you have to
    use an old style steering nozzle also.i used a skat trak also with rings...now the best
    overall performace i had with 84-85 ring...
    Excellent.....have you tried a pump wedge with it as well?

  10. #10
    sp_RXP_GR's Avatar
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    Quote Originally Posted by 1tommygunner1927 View Post
    Excellent.....have you tried a pump wedge with it as well?
    no,i dont think its necessary...

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