Nozzle size?
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Nozzle size?

  1. #1
    Cole SS cole ss's Avatar
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    Default Nozzle size?

    What size nozzle opening is your standard place diverter? Why would you go up or down in nozzle size? Would size change your bowl pressure? Would you match to RPM/HP? Thanks.

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    "Need For Speed" Gearhead's Avatar
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    The standard "non FTN" PD is approximately 3 1/8" diameter. Bowl pressure increases with a smaller nozzle. Without looking, I think Place has nozzle sizes for the FTN nozzle in 3", 3 1/16", 3 1/8" and 3 3/16".

    One would want to optimize their combination for their engine/impeller/hull. Play with it

    Gear

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    Senior Member EVILFORCE's Avatar
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    I had to take a leak and seen this. What was I thinking???????????
    No Fool Like A Old Fool is there?

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    I'm No Expert Shaun's Avatar
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    nobody has more information on this? Is it just one of those things you play with to see if your combo likes it or is the a general rule of thumb with size (smaller nozzle for lower hp, larger for higher hp, etc?)

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    heres an example; with a 10 second texas tunnel hull and a 3.090 nozzle bushing the boat will run a 9.90 on a low 80 degree day but on a mid 90`s day it only runs maybe a 10.15 . at the last of the season i bought another race nozzle with assorted bushings. now on the hot days i use the 3.060 nozzle and run the number. its a trial and error deal. think of it this way. when you crimp the end of a water hose you get less volume but more thrust.

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    One Free Call Does it All CP Performance's Avatar
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    Link to the different sizes.......

    http://www.cpperformance.com/c-698-f...e-inserts.aspx

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  9. #7
    Resident Ford Nut Sleeper CP's Avatar
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    Quote Originally Posted by Shaun View Post
    nobody has more information on this? Is it just one of those things you play with to see if your combo likes it or is the a general rule of thumb with size (smaller nozzle for lower hp, larger for higher hp, etc?)

    Shaun,

    It comes down to a lot of testing and fine tuning.

    The nozzle insert is a fine tuning part.

    I've used the radar gun with them 3 separate times over the years and I think the most I saw was 1.5 mph difference between the biggest and smallest, but I could'nt measure ET. You might find out one gives more top speed past 900' out but the other would ET better to 600'.

    Last edited by Sleeper CP; 11-18-2010 at 05:22 PM.

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  10. #8
    Senior Member bp298's Avatar
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    Quote Originally Posted by Shaun View Post
    nobody has more information on this? Is it just one of those things you play with to see if your combo likes it or is the a general rule of thumb with size (smaller nozzle for lower hp, larger for higher hp, etc?)
    shaun, this has been discussed over and over again. if someone searchs "inserts", all that old stuff can be located. not arguing with jon, but on track, i've found that with everything else remaining the same, fine tuning the nozzle can make a substantial difference in performance, especially considering the relative low cost involved in doing it.

    Quote Originally Posted by Richard Till
    heres an example; with a 10 second texas tunnel hull and a 3.090 nozzle bushing the boat will run a 9.90 on a low 80 degree day but on a mid 90`s day it only runs maybe a 10.15 . at the last of the season i bought another race nozzle with assorted bushings. now on the hot days i use the 3.060 nozzle and run the number. its a trial and error deal. think of it this way. when you crimp the end of a water hose you get less volume but more thrust
    richard, "thrust" or force, is the result of mass x velocity. when changing the exit diameter, you don't necessarily alter total thrust (although it may be slightly changed), but you do change the components of thrust. going smaller increases velocity, going larger decreases velocity.

  11. #9
    Super Moderator HammerDown's Avatar
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    My opinion...unless you're dealing with a super light/quick hull...you're splitting hairs with nozzle size (within reason).
    I sure as heck seriously doubt I'd see any noticeable difference experimenting with nozzle inserts with my heavy ass 21' Daytona.
    EDIT...btw the above was also told to me by a Place Diverter rep.
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    Quote Originally Posted by bp298 View Post
    shaun, this has been discussed over and over again. if someone searchs "inserts", all that old stuff can be located. not arguing with jon, but on track, i've found that with everything else remaining the same, fine tuning the nozzle can make a substantial difference in performance, especially considering the relative low cost involved in doing it.
    .
    Oh why stop now


    There's an insert or two I need to try yet I do know that.

    As of yet the most I saw was 1.5 mph ...have no idea of quick though.

    S CP

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    Senior Member Alter Ego's Avatar
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    I had one of the racers from the Outlaw bunch ( I think his last name was Higgenbothem), BP, you may remember him, be had the black and red stealth parked nearly across from you guys at Smokin in the cove. He told me that he was seeing gains of 2-4 mph gains in his stealth, and each size was good for around 2-3 tenths of a second per nozzle change. I Think that Scotty Seastrum ran like a 10.4 at Chouteau, and changed nozzles one size and it ran like a dang near perfect 10.0. I have a FTN diverter and a couple inserts, but have not done any research for myself, so I guess I still dont have an expereinced dog in this fight.

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    Senior Member bp298's Avatar
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    Quote Originally Posted by Sleeper CP View Post
    Oh why stop now

    There's an insert or two I need to try yet I do know that.

    As of yet the most I saw was 1.5 mph ...have no idea of quick though.

    S CP
    jon, the other deal was only questions because i don't -know-. i can always have opinions or theorys, but don't -know- for certain.

    with inserts, i have 8 years worth of data, and a whole pile of inserts, as you know.

    Quote Originally Posted by HammerDown View Post
    My opinion...unless you're dealing with a super light/quick hull...you're splitting hairs with nozzle size (within reason).
    I sure as heck seriously doubt I'd see any noticeable difference experimenting with nozzle inserts with my heavy ass 21' Daytona.
    EDIT...btw the above was also told to me by a Place Diverter rep.
    and you are certainly entitled to that opinion, and you can believe whatever you like. my hull weighs 730lbs bare (not super light), and i've made over 400 track passes (out of 1200+) solely testing different insert diameters. and based on what i've -learned- through testing, nozzle size does make a difference well beyond splitting hairs. i've also tested different sized inserts on my 23' hallett, from what i've learned on the other boat, and the effect is what i would expect.

    having said all that, there are certain conditions in which the effect of a diameter change won't be as significant. but where the op is located, those conditions don't occur.

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    Senior Member bp298's Avatar
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    Quote Originally Posted by Alter Ego View Post
    I had one of the racers from the Outlaw bunch ( I think his last name was Higgenbothem), BP, you may remember him, be had the black and red stealth parked nearly across from you guys at Smokin in the cove. He told me that he was seeing gains of 2-4 mph gains in his stealth, and each size was good for around 2-3 tenths of a second per nozzle change. I Think that Scotty Seastrum ran like a 10.4 at Chouteau, and changed nozzles one size and it ran like a dang near perfect 10.0. I have a FTN diverter and a couple inserts, but have not done any research for myself, so I guess I still dont have an expereinced dog in this fight.
    yes, i do remember that stealth and what was going on with it. i would not accuse scotty of being dumb. does everyone know how many boat lengths 4 tenths of a second is for a 10 second boat???

    it's not a fight at all. someone asks a question, they get an answer based on years of testing and experience, then someone wants to argue with the answer based on what they think or believe. it doesn't really matter at all, i went through all that for me, not necessarily anyone else, so it's all good. it's personal choice to do something or not...

  16. #14
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    Quote Originally Posted by bp298 View Post
    yes, i do remember that stealth and what was going on with it. i would not accuse scotty of being dumb. does everyone know how many boat lengths 4 tenths of a second is for a 10 second boat???

    ...
    about 60 feet at 100 mph.


    That's what I was referring to about being quick. That would certainly be worth doing.




    S CP

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    " A Government big enough to give you everything you want is big enough to take away everything you have"

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