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  1. #1
    Hydrotherapy's Avatar
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    i have a small nozzle

    Guys jokes aside i cut my R&D hydro nozzle to stock length after finding it was slowing me down,not the gain they sell it as..
    It was only a small loss but any loss is in the wrong direction,
    Decided to cut to stock length last night and make myself a bullet proof copy of the plastic stocker
    Here is where i ran in a small problem,
    when cut to stock length the exit I.D has gone from stock 91mm to the new I.D of 93mm due to taper in R&D one
    Will this affect the performance or has the work been already been done by the jet nozzle and the bigger I.D on the steering one be ok
    Understand that the uncut one was causing slight back preasure due to its length and slightly smaller I.D which was 90mm thus slowing me a small ammount...
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  2. #2

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    Try it and let us know. I have not read of anyone else doing it, it might be something we did not know about.

  3. #3
    Hydrotoys's Avatar
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    Exactly. Plus you have the stock nozzle to compare it to, directly. I can't wait to hear your results.

    How much did you cut off?

  4. #4
    Hydrotherapy's Avatar
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    Quote Originally Posted by hydrotoys View Post
    Exactly. Plus you have the stock nozzle to compare it to, directly. I can't wait to hear your results.

    How much did you cut off?
    hi cut 39.86mm to match orignal..will be a while befroe i can test as ski in many bits for winter mods.. will post as soon as i get out.. unlike you guys, back to back tests are almost impossible if parts are to be changed in the same tide... here were i ski it is very tidal and we only get a small window, to get out and test then return to load on trailer and then the no wake zone both ways would take well over a hour...not blessed with rivers and lakes like you guys bu i can wish and dream..
    Last edited by Hydrotherapy; 01-05-2007 at 01:23 AM.

  5. #5
    spud's Avatar
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    I chopped off a Pro-Tec nozzle to stock length. I should be able to post on it in a week or two. I don't think the Pro-Tec is tapered though.
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  6. #6
    Hydrotherapy's Avatar
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    hi spud nice to see we both have small ones...there all tapered from front to back see what your one now measures and let me know

  7. #7

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    Based on my discussions with scat-trak techs, the optimal difference between the venturi and the swing nozzle is 3-4mm. If you had for instance an 85mm venturi and a 87mm swing nozzle, (2mm difference) then the boat would be difficult turn. on the other hand, if you had an 85mm venturi with a 93mm swing nozzle, (8mm difference) then the turning would be sloppy and not as responsive.

    Of course, that may only apply to skat-trak venturis and swing nozzles. Not only that, they are strictly in the race world. Most people may want their steering to be loose so that their turns are not as sharp.

    I have found 3-4mm to be just right.

    We never talked about changing the swing nozzle diameter to effect top speed.

  8. #8
    2000 GPRXP 4tec shooter98xpl's Avatar
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    if your I.D is bigger than before, I believe you will notice better take off or maybe you'll spin the heck out of that prop. You will lose top end for sure. Unless you run a larger prop to bring the rpms down. I think you will see increased rpms and loss of speed.
    SHOOTER

  9. #9
    Moderator RX951's Avatar
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    I kept mine at full length. I compared the stocker to the R&D and I have a better top end with the R&D in my application. I like the way it turns too.

    Either way, you don't want the plastic stocker it can break.



  10. #10
    Moderator RX951's Avatar
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    Quote Originally Posted by birel33 View Post
    Try it and let us know. I have not read of anyone else doing it, it might be something we did not know about.


    1.
    http://rivaforums.com/eve/forums/a/t...374#4026001374

    2.
    http://rivaforums.com/eve/forums/a/t...514#4096065514

    3.
    http://www.greenhulk.net/forums/newr...reply&p=189830

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