Results 1 to 4 of 4

Thread: Adjusting Webers

  1. #1
    Lighting Specialist jaudette3's Avatar
    Join Date
    Jun 2003
    Location
    Sisters, Oregon
    Posts
    3,997

    Adjusting Webers

    Greetings....

    My '70 S has Webers installed in place of MFI. They're out of tune and I don't of anyone here in Bend who knows how to adjust them properly. So I need to go ahead and learn how to do it myself. Does anyone know where I can find printed information on these carbs, including how to set them up.

    I have compiled and published information on tuning Solex's, Webers and Zeniths for the Technical Section of the the 356 Registry website, but I don't know squat about the Webers used on 911's. Should be able to figure it out though with a little help.

    One other thing....

    The '70 also has headers in place of heat exchangers. It has what appears to be a stock muffler, but is definitely a lot louder than my '73 S that is equipped with MFI and heat exchangers. Is the difference in loudness due to the Webers vs. MFI, or the headers vs. heat exchangers. (My guess is that it's the Webers, as I find birds and other small animals stuck to the grille of my engine lid when I stop <g>).

    Thanks,
    John Audette

  2. #2
    I don't believe h. exchangers vs headers will have any effect on sound. Must be the carbs.
    The basic Haynes 911 manual has basics for adjusting 3-throat Webers. Haynes also published a Weber manual which is even better. Not all that difficult. UniSyn or equivalent is the only tool you need.

  3. #3
    A fellow Porsche enthusiast told me once that "Carburetor is a French word meaning "leave alone"."

    Tom
    "Be who you are and say what you feel because those who mind don't matter and those who matter don't mind." - Dr. Seuss
    "Experience is the mother of wisdom" - idiom
    "Let them that don't want none, have memories of not gettin' any"- Brother Dave Gardner

    Early S Registry #235
    rgruppe #111

  4. #4
    Goldmember ttweed's Avatar
    Join Date
    Oct 2002
    Location
    La Jolla, CA
    Posts
    1,429
    Quote Originally Posted by jaudette3
    Greetings....
    Does anyone know where I can find printed information on these carbs, including how to set them up.
    There are some setup and tuning guides available from PMO. Go to this site for links to them.

    It has what appears to be a stock muffler, but is definitely a lot louder than my '73 S that is equipped with MFI and heat exchangers.
    You will definitely get more intake noise from carbs if they have rainshields and/or open-element air cleaners instead of the stock metal air cleaner shrouding with single snout. I would also look at the muffler closely, especially the top, which will require removing it from the car. It is very possible it has been cut and internal baffling removed. There will be a tell-tale welded opening in the body if so, and that is often done to the top side, invisible when installed, so as to support the "plausible deniability" of any modification when inspected by authorities- "Why no, Officer, it is a factory stock muffler...."

    TT
    Tom Tweed
    Early S Registry #257
    R Gruppe #232
    Rennlist Founding Member #990416-1164
    PCA National DE Instructor
    Read my surf novel!

Similar Threads

  1. FS: carb adjusting screw springs, NOS
    By 9seriesguy in forum For Sale: 911 Parts
    Replies: 1
    Last Post: 12-04-2012, 10:59 PM
  2. Adjusting Carbs - solex
    By vintage83 in forum Technical Info
    Replies: 7
    Last Post: 06-12-2008, 05:14 PM
  3. Adjusting door striker plates
    By pu911rsr in forum Technical Info
    Replies: 4
    Last Post: 04-06-2008, 07:02 PM
  4. Weber air adjusting screw set up
    By cosley in forum Technical Info
    Replies: 2
    Last Post: 09-27-2006, 02:28 AM
  5. Adjusting Koni Struts
    By CurtEgerer in forum Technical Info
    Replies: 5
    Last Post: 04-27-2006, 05:25 AM

Posting Permissions

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

Message Board Disclaimer and Terms of Use
This is a public forum. Messages posted here can be viewed by the public. The Early 911S Registry is not responsible for messages posted in its online forums, and any message will express the views of the author and not the Early 911S Registry. Use of online forums shall constitute the agreement of the user not to post anything of religious or political content, false and defamatory, inaccurate, abusive, vulgar, hateful, harassing, obscene, profane, sexually oriented, threatening, invasive of a person's privacy, or otherwise to violate the law and the further agreement of the user to be solely responsible for and hold the Early 911S Registry harmless in the event of any claim based on their message. Any viewer who finds a message objectionable should contact us immediately by email. The Early 911S Registry has the ability to remove objectionable messages and we will make every effort to do so, within a reasonable time frame, if we determine that removal is necessary.