carb work

Discussion in 'Technical' started by Yellow72Mavrick, Sep 21, 2008.

  1. Yellow72Mavrick

    Yellow72Mavrick Banned

    Joined:
    Jan 25, 2005
    Messages:
    1,274
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    Memphis, Tenn.
    Vehicle:
    1977 maverick 2 door ( my sons) 250 c4
    Can anybody tell me why people pull the choke and choke plate off a ford 2 barrel carb? Is it for any certain reason and what good or harm does it do?? Friend has one on his truck , its cold natured when first started but after it warms up no problems. Just want to know...Jim:hmmm:
     
  2. Bryant

    Bryant forgot more than learned

    Joined:
    Aug 7, 2007
    Messages:
    6,535
    Likes Received:
    142
    Trophy Points:
    181
    Garage:
    1
    Location:
    San Diego
    Vehicle:
    71 Maverick
    a choke makes it easy to start a cold motor. it runs rich till the choke is open. the choke plate on top of the carb is slightly restrictive to air flow. people remove them to get more air or easyer air flow into the carb wich should result in more power.
     
  3. PaulS

    PaulS Member extrordiare

    Joined:
    May 3, 2004
    Messages:
    4,858
    Likes Received:
    6
    Trophy Points:
    0
    Location:
    Seattle area
    Vehicle:
    1966 Mustang, 1972, 73, 73 and 73 Mavericks
    Test it on the engine dyno and you will find that you lose a couple of HP with the choke removed. That plate when completely open helps direct air into the venturiis.
    The choke eliminates cold start and cold running problems when they are adjusted correctly. Some people really mess up the air flow by cutting the air horn off completely.
     
  4. Andysutt

    Andysutt '72 Comet GT

    Joined:
    Dec 30, 2002
    Messages:
    3,086
    Likes Received:
    3
    Trophy Points:
    112
    Location:
    Conway Arkansas
    Vehicle:
    1972 Comet GT
    I've never done it on a 2 barrel carb

    But I had a holley 4 barrel that the choke horn and everything was milled off and machined and looked "factory" without it there and it ran great. lots better than the otherwise identical one i had that still had the entire choke
     
  5. PaulS

    PaulS Member extrordiare

    Joined:
    May 3, 2004
    Messages:
    4,858
    Likes Received:
    6
    Trophy Points:
    0
    Location:
    Seattle area
    Vehicle:
    1966 Mustang, 1972, 73, 73 and 73 Mavericks
    Andysutt,
    I have heard lots of stories like yours but I have never seen a carb with a milled choke housing make more HP on a dyno than one with the choke and housing in place. There is a lot of things that can be modified to assist in making up for the missing choke housing but air flow is always lower than with the housing in place.
    Its the same when you run without an air filter in place.
     
  6. Andysutt

    Andysutt '72 Comet GT

    Joined:
    Dec 30, 2002
    Messages:
    3,086
    Likes Received:
    3
    Trophy Points:
    112
    Location:
    Conway Arkansas
    Vehicle:
    1972 Comet GT

    I believe you, but I do know my truck ran better w/ the air cleaner on and w/ the carb w/ no choke horn. I don't know why, but it did.

    The jets, metering blocks, bowls and floats, etc were all the same. Actually the same ones swapped onto each carb.

    Guess it's just one of the weird things that happens occasionally.
     
  7. maverick1970

    maverick1970 MCG State Rep

    Joined:
    Sep 9, 2003
    Messages:
    7,371
    Likes Received:
    57
    Trophy Points:
    242
    Location:
    Missouri
    Vehicle:
    69 1/2, 70 Maverick and 71 Grabber
    In this case, I think it is likely that someone didn't understand how a choke operates and did not know how to fix a problem with it. Thus their solution was to remove it completely.
     
  8. Andysutt

    Andysutt '72 Comet GT

    Joined:
    Dec 30, 2002
    Messages:
    3,086
    Likes Received:
    3
    Trophy Points:
    112
    Location:
    Conway Arkansas
    Vehicle:
    1972 Comet GT

    Agreed (y)
     
  9. Andysutt

    Andysutt '72 Comet GT

    Joined:
    Dec 30, 2002
    Messages:
    3,086
    Likes Received:
    3
    Trophy Points:
    112
    Location:
    Conway Arkansas
    Vehicle:
    1972 Comet GT


    Not trying to argue at all, but curious as to why they make the "Holley" carbs these days w/ no horn from the factory, if you are indeed correct.
     
  10. MNTony

    MNTony aka Godzirra

    Joined:
    Jul 8, 2003
    Messages:
    2,020
    Likes Received:
    37
    Trophy Points:
    123
    Location:
    Surprise, AZ
    Vehicle:
    72 Turbo FI Maverick, 2006 GMC Sierra Duramax 4x4, 2014 Ford Mustang GT 4spd
    In my boy's case it was a manual choke that closed during a run. He thought that there was some serious problem until we got it figured out. We removed it soon after that and life is good. Of course I live in Arizona and the cars are warmed up without even starting them here!
     
  11. Yellow72Mavrick

    Yellow72Mavrick Banned

    Joined:
    Jan 25, 2005
    Messages:
    1,274
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    Memphis, Tenn.
    Vehicle:
    1977 maverick 2 door ( my sons) 250 c4
    thanks for the info guys
     

Share This Page