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Technical Carter WCFB tech

Discussion in 'Traditional Hot Rods' started by carbking, Dec 15, 2013.

  1. jimmy six
    Joined: Mar 21, 2006
    Posts: 10,002

    jimmy six
    ALLIANCE MEMBER

    I've had all of my WCFB's apart. Some had the springs under the accelerator pump and others did not. The spring under the power piston indeed does hold the metering rods in the Jets and for a small amount off ez driving idle; but there is an arm that you set with a screwdriver the forces the metering rod actuating level up under more throttle no mater what the vacuum. I believe the vacuum helps pull the metering rods back down more than any thing. I've tried minor adjustments in the setting of the adjusting arm to improve fuel milage but they seem to be the best as the factory sets them. There are different stepped metering rods too.I like them anyway and am going to keep them... Good Luck.
     
    flypa38 likes this.
  2. According to page #5 of this manual,

    http://www.carburetor-blog.com/manuals/wcfb_manual.pdf

    ...the primary metering rods are both mechanically and vacuum controlled. If there is any vacuum control at all I'd think there would still be a spring used under the power piston.
     
  3. U.K.
    Joined: Dec 16, 2010
    Posts: 21

    U.K.
    Member

    IMG_20160212_142820.jpg
    Yes Clay, the vacuum piston spring is under the power piston, the car hadn't been started in 3yrs and im not sure when last driven, but when I purchased it I set about getting her started and it ran quite well, unable to take it for a test drive as there were no pedal brakes, so no idea how the carb would have been on a run.
    There is a spring on the throtle linkage (see pic) so maybe that's why there is no spring under the pump.

    Thanks Jimmy, feeling better about leaving the pump spring out now, but definitely want that vacuum one reinstated, I won't much though about how it's working until I get her out on the street for a test drive.

    Cheers for the link Clay.
     
    Last edited: Feb 12, 2016
  4. U.K.
    Joined: Dec 16, 2010
    Posts: 21

    U.K.
    Member

    Got it running after sitting for 3 yrs, and with the carb how the PO left it.


    Then the carb started acting up


    Flooding
     
  5. cowboyinachair
    Joined: Nov 17, 2010
    Posts: 352

    cowboyinachair
    Member
    from colorado

    THE FLOAT IS TO HIGH OR THE NEEDLE ISN'T STOPPING THE FUEL COMING IN
     
  6. ...or excessive fuel pressure. Or a sunk float. Or a piece of flotsam (or jetsam) stuck in the needle and seat. Or a sticking float or needle and seat. Or gremlins. Or a loose seat. :oops:

    You should also pull the plugs and spin the engine over with the coil disconnected to clear the fuel out of the cylinders before attempting to start the engine again. And maybe change the oil too as it's probably diluted with gasoline. Or petrol, if you prefer. :rolleyes:
     
    Last edited: Feb 12, 2016
  7. rails32
    Joined: Oct 29, 2008
    Posts: 110

    rails32
    Member

    sometimes if the carb base gaskets are to thin the linkage will hit the manifold on yhe passenger side
     
  8. U.K.
    Joined: Dec 16, 2010
    Posts: 21

    U.K.
    Member

    Many thanks guys...sincerely appreciated.
    I will say that i'm surprised it ran at all with the old fuel and the amount of crap inside the carb, since the first start I have rebuilt the fuel pump also which was in a mess too, and fresh PETROL in the tank...:D
    The carb is still sitting in my living room for now, waiting until I get a Vacuum spring, so until then I wont know how the rebuild has gone until it's all back together and I fire her up.
    I'll post back with the results.
     
  9. DYNODANNY
    Joined: Aug 9, 2006
    Posts: 1,411

    DYNODANNY
    Member

    Some good information. I'm about to do a 62 corvette WCFB swap on my .40 over 241 hemi. with an Offenhauser intake. Will see how that goes. I know hemi's respond good to intake and carb swaps.
     
  10. oj
    Joined: Jul 27, 2008
    Posts: 6,270

    oj
    Member

    Just so you guys know I have an extensive Carter inventory, NOS stuff that I am constantly adding to. Carter is anal about individual carbs, thousands of bits and pieces, each was specific to the engine it sat on. I might have the odd piece if you need it. Most of my inventory is '30's thru very early '50's - pre AFB stuff.
    Shoot me a PM if there is something I can help you with.
     
    Blues4U and ARTEMIS1759 like this.
  11. Regarding the 'matching number' comments on Chevrolet dual-quad set-ups. By matching numbers, I hope you are referring to the number on the air horn ( 6-1299 ). The front and back carbs are different! The original brass tags are different. The 'correct front carb' has no choke and and no holes for the choke blade to mount on. In 1957, there were three different style air valve counter weights used changing as the production year progressed. First style used a short arm and thin weights carried over from 1956, second used short arms and thick weights, and the third style which continued though the last dual quad engines in 1962 used a long arm and thick weights. I once tried to trade a guy who had a 1960 Corvette with mid-production '57 carbs on it for my set which was correct for his car. He had the mid-production '57 carbs which would have been correct for my early January '57 built car. His car was in a judged Corvette meet. I don't know whether the judges picked up on the carbs or not, but I do know that he was an A**hole to me when I made the offer.
     
    falcongeorge likes this.
  12. jimmy six
    Joined: Mar 21, 2006
    Posts: 10,002

    jimmy six
    ALLIANCE MEMBER

    Dex, his car judge may not have known and if he we to another judging that one might have and nailed him on it. It is also unfortunate he did listen to your expertise. This whole thread has been enlightening.
     
  13. Andy
    Joined: Nov 17, 2002
    Posts: 4,797

    Andy
    Member

    I have a .040 over 241 as well. I run a 54 Buick WCFB and it runs great. I had bought a Offy 4 bbl manifold with the adapter plate. I took the adapter plate off and found almost no metal left where they had bored the old casting out to use the later carb. You might want to have the flange welded to give the gasket a chance of sealing. I sent my manifold back.
     
  14. I"m curious to know how the differences between those 57 Corvette carbs could have been ascertained?

    If the air filters are on you cant tell about the choke blades. Do they remove the air filters in Corvette judging?

    Not pickin - just trying to learn something here.

    Oldmics
     
  15. oj
    Joined: Jul 27, 2008
    Posts: 6,270

    oj
    Member

    I think you can read the numbers on the front right corner of the carb. And, they'll do that at a judged show when you attain a certain level.
     
  16. Bird man
    Joined: Dec 28, 2009
    Posts: 697

    Bird man
    Member
    from Milwaukee

    It's time to chase a large bog upon acceleration. Carb has been restored & looks great on the outside.
    Idles well & great cruising behavior, milage. If not the accelerator pump, what should I be looking for?
    1955 Packard.
     
  17. carbking
    Joined: Dec 20, 2008
    Posts: 3,161

    carbking
    Member

    dana barlow likes this.
  18. Bird man
    Joined: Dec 28, 2009
    Posts: 697

    Bird man
    Member
    from Milwaukee

    Hi Jon,
    Just about any time I try to accelerate. The vac advance is new (and working :)
     
  19. carbking
    Joined: Dec 20, 2008
    Posts: 3,161

    carbking
    Member

    Sounds like the accelerator pump. Did you test it as suggested by the link in my previous post?

    Jon.
     
    dana barlow likes this.
  20. Bird man
    Joined: Dec 28, 2009
    Posts: 697

    Bird man
    Member
    from Milwaukee

    Looked at that link, I have a big, healthy pump shot. I have been expecting to dig deeper:(
     
  21. falcongeorge
    Joined: Aug 26, 2010
    Posts: 18,341

    falcongeorge
    Member
    from BC

    The weights are hanging out on the sides of the carbs for all to see. Re-pop corvette weights and throttle linkage are available.
     
  22. carbking
    Joined: Dec 20, 2008
    Posts: 3,161

    carbking
    Member

    Bird man - call me.

    Jon.
     
  23. Jon,

    I am running two WCFBs on a 1957 Dodge hemi, 325 cubes, slightly warmed up engine. What is the optimum fuel pressure to use?

    Thank you,

    Steve
     
  24. jimmy six
    Joined: Mar 21, 2006
    Posts: 10,002

    jimmy six
    ALLIANCE MEMBER

    I have 2 WCFB's on my stock Y-Block and feel the stock pressure of 4 is good. Usually once a month I "open it up" to make sure good gas is in all the fuel chambers. I'm normally on the freeway and do it from 60 mph and let off between 85 and 90. It has never acted like it has been out of fuel. It still has the 5/16" stock fuel line and it would be nice to have a 3/8". I know 270 hp Chevs had bigger lines than the lower hp ones but I know nothing of the Mopars with the stock dual quads. Good luck.
    PS : we run a trick 750 Holley on our 377 dirt track engine and were told never go over 5 psi. It has a -8 line from the tank to the pump and also to the regulator.
     
  25. flypa38
    Joined: May 3, 2005
    Posts: 530

    flypa38
    Member

    Jon (carbking),
    Quick question. I work nights so a phone call wouldn't work out.
    Anyhow, I have a WCFB on my 56 Pontiac. The tag is long gone. What is the difference between 2364S and 2364SA? Also, does anyone reproduce tags?
    Thanks,
    Johnny
     
  26. carbking
    Joined: Dec 20, 2008
    Posts: 3,161

    carbking
    Member

    WCFB's can, depending on the size of the fuel orifice, accomodate 5 psi without issues.

    When Carter would "tweak" the calibration, but not enough to warrant a new number, a letter would be appended after the "S". The first tweak would be an "A", the second tweak would change the "A" to a "B", etc. A typical tweak might be changing an idle restrictor from 0.055 to 0.052, or an idle jet from 0.032 to 0.033.

    Without pulling the prints, cannot tell you the difference from a 2364S to a 2364SA, but it would be minor.

    To my knowledge, no one is selling reproduction tags.

    Jon.
     
  27. ARTEMIS1759
    Joined: Jan 16, 2010
    Posts: 82

    ARTEMIS1759
    Member

    Hey OJ you wouldn't have a rebuildable 2x4s with intake. Will need one by next summer to eliminate a late 70s intake and carb on a good wrench 350. Want to build a circa 58 looking Vette motor
    Before I get my 4200 engine put together. The 350 is temporary. Want a 475 horse inline 6 that I am gonna try to retrify with some add ons but keeping EFI. Need to find a fabricator for some bolt on parts. Granted it will still be modern but it will not look so tacky...
     
    Hnstray likes this.
  28. Hnstray
    Joined: Aug 23, 2009
    Posts: 12,171

    Hnstray
    ALLIANCE MEMBER
    from Quincy, IL

    ARTEMIS1759..........glad to find another Atlas/Vortec 4200 enthusiast.

    Ray
     
    rhtfo and ARTEMIS1759 like this.
  29. oj
    Joined: Jul 27, 2008
    Posts: 6,270

    oj
    Member

    A double four barrel with good carbs is hard to find, I'm afraid I can't help you there but thanks for asking.
     
  30. Rich Wright
    Joined: Jan 9, 2008
    Posts: 3,922

    Rich Wright

    A friend of mine has one. It's a Weiand intake and the WCFBs have been professionally rebuilt.
    If your interested send me a PM. He's racing in Las Vegas this weekend so I won't know about costly Monday or Tuesday.
     

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