pxctoday

» Log in

User Name:

Password:

Not a member yet?
Register Now!

» Find OEM Parts

» Jobs

» wallpapers

Results 1 to 7 of 7
  1. #1
    resident guru mandriva's Avatar
    Join Date
    Sep 2009
    Location
    montreal,quebec
    Age
    40
    Posts
    1,015

    jet size on stinger pipe? effect?

    hi, I would like to know the role of the main jet in a stinger pipe? just keep cool hole rubber or real gain performance? for aftermarket pipe like factory pipe spec 1, and 2 and rossier also!!

    thank
    Rossier 7250 rpm
    110 mid pipe/200 stinger
    Head 43cc/45 squish
    Strak swirl 17/22

  2. #2
    Top Dog Russell2sx's Avatar
    Join Date
    Oct 2009
    Location
    socal
    Age
    42
    Posts
    1,723

    jet size on stinger pipe? effect?

    It depends on the stock opening into the stinger...my Coffman dumps a 3/8" line straight in so a ton of water hits the waterbox and steals power,I put a small ball valve on it so I can adjust the flow and yes it makes a pretty big difference

  3. #3
    PWCToday Guru cr21sparky's Avatar
    Join Date
    Aug 2011
    Location
    Weatherford,TX
    Posts
    395

    Re: jet size on stinger pipe? effect?

    Before I had ecwi I had a jetworks control valve I shimmed it so at about 4000rpm
    It would start shooting water into waterbox. Had 130-150 jets
    Casey

    WWW.NEVERSATISFIEDMOTORSPORTS.COM

    1997 SEA DOO SPX jdyn grate,vtec,beachhouse,miller head,spec1,skat sw17-22,wc nozzle,umi,44blackjacks,TNT ecwi,tdr-wb,microtouch,needs more!!!
    2010 KAWASAKI STX 15F r&d grate,r&d power filter

  4. #4
    resident guru mandriva's Avatar
    Join Date
    Sep 2009
    Location
    montreal,quebec
    Age
    40
    Posts
    1,015

    Re: jet size on stinger pipe? effect?

    update this topic....I was experimenting with changing the amount of water flow to the
    stinger on a rossier this weekend. Results were different
    than expected. Drying out water to the stinger resulted in about 70-100
    less max rpm, but EGT's dropped about 100 degrees!
    My testing results are correct. When you reduce the water at the stinger
    it then appears "larger" (less pressure) to the sonic wave. This will lower
    the rpms, increase torque and also reduce your EGT. When you increase water
    at the stinger the results should be opposite.and While you will get the results you now are expecting please be cautious as
    extra water in the stinger at high RPMs can lead to detonation as the result
    of higher pipe pressures ( higher trapping efficiency).
    rossier recommand keep under 180-200 main on stinger
    Last edited by mandriva; 03-23-2016 at 08:30 PM.
    Rossier 7250 rpm
    110 mid pipe/200 stinger
    Head 43cc/45 squish
    Strak swirl 17/22

  5. #5
    PWCToday Newbie
    Join Date
    Nov 2015
    Location
    itlay
    Age
    47
    Posts
    25

    Re: jet size on stinger pipe? effect?

    Quote Originally Posted by mandriva View Post
    update this topic....I was experimenting with changing the amount of water flow to the
    stinger on a rossier this weekend. Results were different
    than expected. Drying out water to the stinger resulted in about 70-100
    less max rpm, but EGT's dropped about 100 degrees!
    My testing results are correct. When you reduce the water at the stinger
    it then appears "larger" (less pressure) to the sonic wave. This will lower
    the rpms, increase torque and also reduce your EGT. When you increase water
    at the stinger the results should be opposite.and While you will get the results you now are expecting please be cautious as
    extra water in the stinger at high RPMs can lead to detonation as the result
    of higher pipe pressures ( higher trapping efficiency).
    rossier recommand keep under 180-200 main on stinger

    please could you explain what does it means a 180-200 jet (1.8-2.0 hole diameter in mm?) and wich is the water with whom i could make calculation about the water flow.....
    hope u understand me

  6. #6
    PWCToday Newbie
    Join Date
    Nov 2015
    Location
    itlay
    Age
    47
    Posts
    25

    Re: jet size on stinger pipe? effect?

    Water pressure i miss a word

  7. #7
    PWCToday.com Is My Home Away From Home wmazz's Avatar
    Join Date
    Jul 2013
    Location
    Riverside, CA
    Age
    57
    Posts
    2,339
    Blog Entries
    6

    Re: jet size on stinger pipe? effect?

    Quote Originally Posted by mandriva View Post
    When you increase water at the stinger the results should be opposite.and While you will get the results
    you now are expecting please be cautious as extra water in the stinger at high RPMs can lead to detonation
    as the result of higher pipe pressures ( higher trapping efficiency). Rossier recommend keep under 180-200
    main on stinger
    Quote Originally Posted by mandriva View Post
    please be cautious as extra water in the stinger at high RPMs can lead to detonation
    I agree with this statement, but many people lean towards modifying the stinger to a larger
    (safer) diameter. But I do not agree that it is ever a single source for detonation if the pipe
    is setup as recommended. (But I believe that is what mandriva was trying to say)

    There is the possibility that using dual cooling lines may cause, or add to a list of problems
    when the owner uses a single line to supply the exhaust system.

    A 440 pump supplies 30 psi of flowing (not static) water pressure. A 750 supplies 40psi, a
    900 supplies 50 psi.

    When you use a single line to supply an exhaust pipe, you are increasing the water pressure
    at the headpipe. When you increase the pressure at the headpipe, you are increasing the
    pressure at the water bleeds and create more torque because you are lengthening the pipe.
    You are also increasing the water pressure at the stinger, and that can be good or bad.

    Quote Originally Posted by mandriva View Post
    as the result of higher pipe pressures ( higher trapping efficiency).
    Not sure I agree with this, maybe it is just the terminology. Mainly because the stinger diameter
    influences how the pipe scavenges fuel air mixture inside the engine. It is similar to a control
    valve.

    Gordon Jennings said that when the stinger is too small, it will cause the piston crown to
    overheat and detonation will occur.

    But what really happens, is when the stinger is too small, a portion of the hot spent gases
    (exhaust) is unable to escape. The hot spent gas backs up into the exhaust port and mixes
    with the incoming fresh air-fuel mixture.

    Since the hot spent gases can not be burned twice, the engine looses power. The hot spent
    gas also preheats the fresh air fuel mixture, the engine looses power, and combustion temps
    increase to the point of self ignition (Detonation).

    It is the hot spent gases that heats the piston crown, and how fast the piston crown is heated
    is dependent on other factors.

    Normally stinger diameter is a variable left to the designer or R&D tech.

    Water routings on a pipe should only be done after the impeller, and jetting allow the engine
    to easily make or exceed peak HP rpm at wot.


    Bill M.
    Last edited by wmazz; 12-30-2016 at 04:19 PM.
    Horsepower == Speed, RPM != Speed



Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Powered by vBadvanced CMPS v4.2.0