Results 1 to 9 of 9

Thread: SU Carburetors (Needle Valve)

  1. #1
    Registered User
    Member ID
    CZCC-19448
    Join Date
    Jun 2009
    Location
    USA
    Posts
    90

    Default SU Carburetors (Needle Valve)

    I was cleaning the SUís on my 240Z and noticed that the needle in the middle on one of the SUís was a little bent and this caused the core to get stuck approx 2/3rdís the way down.

    What are my options? Do I have to replace the core or can you just buy a new needle. Where can i find a new needle?
    I looked all over the SU's and was unable to find make and model.





    I apologize in advance if the question are trivial.

  2. #2
    Registered User MikeW's Avatar
    Member ID
    CZCC-3294
    Join Date
    Dec 2002
    Location
    Atlanta, GA, USA
    Posts
    2,739

    Default

    http://www.ztherapy.com

    I did see a trick in the old VHS video from ZTherapy that showed a way of straightening a needle by chucking it in a drill, running the drill at speed, and gently pressing the needle sideways into a rag or towel.
    -Mike
    Add your Z to my online spreadsheet registry

  3. #3
    Registered User
    Member ID
    CZCC-2139
    Join Date
    May 2002
    Location
    Salem Or
    Posts
    1,556

    Default

    The problem with bent needles is that as they rub on the fuel nozzle the orifice in the nozzle can get worn oblong thus throwing off the mixture. Couple this with the fact that the needle can get worn smaller while the orifice is worn larger, moxture can be a crao shoot. Orifice size and needle size all the way down the profile are pretty precise.

    You can try the drill motor straightening but if that doesn't work to your satisfaction we can supply needles. Just look your needle over well for signs of wear (shiny area) as it may have been going on for a long time.

    We can also supply spot-on nozzles as well.
    Bruce Palmer
    Salem Or
    Sales@ztherapy.com
    www.ztherapy.com
    503-587-9800

  4. #4
    Registered User
    Member ID
    CZCC-19448
    Join Date
    Jun 2009
    Location
    USA
    Posts
    90

    Default

    Quote Originally Posted by Bruce Palmer View Post
    The problem with bent needles is that as they rub on the fuel nozzle the orifice in the nozzle can get worn oblong thus throwing off the mixture. Couple this with the fact that the needle can get worn smaller while the orifice is worn larger, moxture can be a crao shoot. Orifice size and needle size all the way down the profile are pretty precise.

    You can try the drill motor straightening but if that doesn't work to your satisfaction we can supply needles. Just look your needle over well for signs of wear (shiny area) as it may have been going on for a long time.

    We can also supply spot-on nozzles as well.
    How much for 2 needle's?
    I dont know the model or part number.

  5. #5
    NUTs according to wife ChrisZ's Avatar
    Member ID
    CZCC-14427
    Join Date
    May 2007
    Location
    Denmark - in front of my coffee, behind the laptop
    Age
    53
    Posts
    904

    Default

    If you try to straighten it as MikeW said above, then use a piece of soft wood instead, it works very well.

    Chris
    -73 240Z HLS30-171039
    -66 Roadster SPL311-05204

  6. #6
    Registered User
    Member ID
    CZCC-2139
    Join Date
    May 2002
    Location
    Salem Or
    Posts
    1,556

    Default

    Quote Originally Posted by logan1 View Post
    How much for 2 needle's?
    I dont know the model or part number.
    A pair of needles will set you back $30. Again you need to make a determination about the condiition of the nozzles before making a decision. We'll help determine a needle choice when you order.
    Bruce Palmer
    Salem Or
    Sales@ztherapy.com
    www.ztherapy.com
    503-587-9800

  7. #7
    Registered User
    Member ID
    CZCC-19448
    Join Date
    Jun 2009
    Location
    USA
    Posts
    90

    Default

    Quote Originally Posted by MikeW View Post
    http://www.ztherapy.com

    I did see a trick in the old VHS video from ZTherapy that showed a way of straightening a needle by chucking it in a drill, running the drill at speed, and gently pressing the needle sideways into a rag or towel.
    Quote Originally Posted by 2 fast 2 Z View Post
    If you try to straighten it as MikeW said above, then use a piece of soft wood instead, it works very well.

    Chris
    thanx guys i used a drill and some soft wood and it worked wonders.

  8. #8
    Registered User
    Member ID
    CZCC-2139
    Join Date
    May 2002
    Location
    Salem Or
    Posts
    1,556

    Default

    Dang, and we miss out on a monster needle sale......
    Bruce Palmer
    Salem Or
    Sales@ztherapy.com
    www.ztherapy.com
    503-587-9800

  9. #9
    Registered User
    Member ID
    CZCC-19448
    Join Date
    Jun 2009
    Location
    USA
    Posts
    90

    Default

    Quote Originally Posted by Bruce Palmer View Post
    Dang, and we miss out on a monster needle sale......
    Dont worry i'm sure i'll need something from you guys soon.

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. SU needle specs
    By Force Fed in forum SU Carb Discussions
    Replies: 1
    Last Post: 08-01-2008, 02:00 AM
  2. Replies: 4
    Last Post: 04-24-2006, 01:12 PM
  3. Question about S30 rear disc brakes....
    By e_racer1999 in forum Wheels, Tires and Brakes (S30)
    Replies: 19
    Last Post: 08-21-2004, 08:54 AM
  4. Help! Need to Identify Needle sizes for SU Carbs
    By LedFoot in forum Carburetors (S30)
    Replies: 3
    Last Post: 10-24-2003, 06:13 PM

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •