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Thread: 4 Barrel Carb Linkage Modification
          
   
   

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  1. #1
    Triker is offline CHR Member Visit my Photo Gallery
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    Question 4 Barrel Carb Linkage Modification

     





    I have a V8 trike that has a small block Chevy engine.
    It is a 267 and has a small 4 barrel carb.

    The trike has a foot throttle.
    The gas pedal has very little "travel" from nothing to
    foot on the floor.

    How can I modify the carb linkage to give me more travel
    in the gas pedal?

    Thanks to all.

    Happy holidays to all the members on here!


  2. #2
    HOSS429's Avatar
    HOSS429 is offline CHR Member Visit my Photo Gallery
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    sure .. on either end I would bet .. on the carb end find or create another place for the cable to hook onto the throttle lever so it is longer in arc ..the longer the throw the longer the travel ..
    iv`e used up all my sick days at work .. can i call in dead ?

  3. #3
    R Pope is offline CHR Member Visit my Photo Gallery
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    You only need two throttle positions anyway.....idle and wide open!
    NTFDAY likes this.

  4. #4
    pepi's Avatar
    pepi is offline CHR Member/Contributor Visit my Photo Gallery
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    Quote Originally Posted by Triker View Post

    I have a V8 trike that has a small block Chevy engine.
    It is a 267 and has a small 4 barrel carb.

    The trike has a foot throttle.
    The gas pedal has very little "travel" from nothing to
    foot on the floor.

    How can I modify the carb linkage to give me more travel
    in the gas pedal?

    Thanks to all.

    Happy holidays to all the members on here!

    say Triker, just a quick tip, the mods you ask about. You would be much better served if you snap a photo and post it along with the question.

    Lots of good seasoned wrenches hanging out here, trying to imagin how to fit a mod or faburicate a solutation for a specific instance is not easy. Most of us build repair cars, trikes or biked have their own set of space and limitation that must be dealt with.
    I have two brains, one is lost and the other is out looking for it

    Best viewed loud:
    https://www.youtube.com/watch?v=PmmyMGQojzI

  5. #5
    pepi's Avatar
    pepi is offline CHR Member/Contributor Visit my Photo Gallery
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    Quote Originally Posted by Triker View Post

    I have a V8 trike that has a small block Chevy engine.
    It is a 267 and has a small 4 barrel carb.

    The trike has a foot throttle.
    The gas pedal has very little "travel" from nothing to
    foot on the floor.

    How can I modify the carb linkage to give me more travel
    in the gas pedal?

    Thanks to all.

    Happy holidays to all the members on here!

    say Triker, just a quick tip, the mods you ask about. You would be much better served if you snap a photo and post it along with the question.

    Lots of good seasoned wrenches hanging out here, trying to imagin how to fit a mod or faburicate a solutation for a specific instance is not easy. Most of us build repair cars, and can visualize the problem quickly. On the other hand trikes or bikes have their own set of space and limitations that must be dealt with.
    I have two brains, one is lost and the other is out looking for it

    Best viewed loud:
    https://www.youtube.com/watch?v=PmmyMGQojzI

  6. #6
    Triker is offline CHR Member Visit my Photo Gallery
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    I will take a picture and post it here so all you seasoned wrenches can give me ideas.
    I have never tried anything like modifications to a carduretor before.

    Thans to everyone for posting.

    Hope all of you had a Merry Christmas and hopes for a great New year!

    Triker
    Last edited by Triker; 12-26-2014 at 07:20 PM. Reason: Spelling

  7. #7
    Triker is offline CHR Member Visit my Photo Gallery
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    Question 4 Barrel Carb Mods

     




    Attached (I hope) is a picture of the carb on my V8 trike.
    What can I do to give me more "travel" for my gas pedal?
    It HAS to be done at the carb end.

    Any ideas?


    Also,Any way to tell what CFM this carb is?

    Hope everyone had a great Christmas.
    Attached Images

  8. #8
    firebird77clone's Avatar
    firebird77clone is offline CHR Member Visit my Photo Gallery
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    First thing that comes to mind, is to bolt an extension arm to the bellcrank. It will increase the arc, might help some.
    .
    Education is expensive. Keep that in mind, and you'll never be terribly upset when a project goes awry.
    EG

  9. #9
    Triker is offline CHR Member Visit my Photo Gallery
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    [B]Firebird77clone--

    Excuse my lack of knowledge---What is a "Bellcrank"?[/B]

  10. #10
    jerry clayton's Avatar
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    Is the carb opening fully now with what you have?? or is it limited by the housing over the cable contacting the carb bell crank??

  11. #11
    HOSS429's Avatar
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    artists rendering

     



    this is what i believe you need to try .. the top drawing is what you have .. short bell crank .. short throw .. short foot pedal travel .. the bottom drawing is what you need .. longer bell crank .. longer foot pedal throw .. longer travel .. add/bolt something to the short bell crank to make it longer ..
    Attached Images
    iv`e used up all my sick days at work .. can i call in dead ?

  12. #12
    jerry clayton's Avatar
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    This might give you the idea of what you need to do

  13. #13
    Henry Rifle's Avatar
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    Since that carb is a Rochester Quadrajet, it's almost surely 750 CFM. There were some 800 CFM, but those are in the minority. An extra 50 CFM wouldn't matter much any way.
    Last edited by Henry Rifle; 12-28-2014 at 12:27 PM.
    Jack

    Gone to Texas

  14. #14
    Triker is offline CHR Member Visit my Photo Gallery
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    Hoss429----WHAT A GREAT CAR!!!!

    I has a 1969 Mach I for several years.

    I understand about a longer bell crank equals a longer travel---BUT---

    The bell crank is attached to some shaft inside the carb.
    That shaft only rotates so many degrees--"Regardless of how long the bell crank is" right?

    Or am I missing something?

    Thanks for the reply

  15. #15
    Triker is offline CHR Member Visit my Photo Gallery
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    Jerry Dayton,

    I guess I am looking at a longer than normal bell crank, right?---BUT---

    The bell crank is attached to a shaft inside the carburetor.
    I am assuming that the brass "thing" is the end of the shaft that is
    hammered over.

    That shaft only rotates a certain number of degrees, right?
    So why would a longer bell crank give me more pedal travel?

    What am I missing?

    Thank you.

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