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Best jet size for twin carbs on a 53 chevy?

Discussion in 'The Hokey Ass Message Board' started by doubledoyle, Apr 15, 2012.

  1. doubledoyle
    Joined: Aug 18, 2008
    Posts: 138

    doubledoyle
    Member
    from norwich UK

    Hi guys,

    i need some advice for my brother over here in the uk
    Hes running twin rochesters carbs on a offenhauser inlet on his 235 ci , Problem is it seems to be really over fueling, Has anyone got any advice on what jet sizes to use, i expect there still using the orginal jets hence the over fueling


    thanks guys
     
  2. scrmkr
    Joined: Nov 19, 2011
    Posts: 16

    scrmkr
    Member
    from memphis tn

    TTT..someone should know. Maybe there's a way to run on a single carb until you get get down on it. :confused:
     
  3. engine138
    Joined: Oct 5, 2007
    Posts: 1,545

    engine138
    ALLIANCE MEMBER
    from Commack NY

    Hey D. DOYLE is he running a heat plate to his manifold?
     
  4. Curt B
    Joined: Oct 15, 2009
    Posts: 325

    Curt B
    Member


  5. carbking
    Joined: Dec 20, 2008
    Posts: 2,866

    carbking
    Member

    Generally, overfueling with the Rochesters is a direct function of warped casting causing the power valve(s) to be open all of the time. (Read the article in the link posted by Curt).

    We have found generally that LARGER jets are required on dual set-ups rather than smaller ones.

    Jon.
     
  6. Smokey2
    Joined: Jan 11, 2011
    Posts: 920

    Smokey2
    Member

    Vary Goode Info, been wonderin' Myself, But was Afraid To Ask ! :D
    Found that the 235 engines Don't git the Good Fuel Mileage one wood EXPECT !
    My dad's '51 Ford Got 21 mpg Hiway, and A friend and I got 21 mpg in his '49 ferd Woodie (on A 6,000 mile Trip ! ) :Dwhen we visited Bill Harrah's Auto Display in Reno, Before Holiday Inns Bought The Casinos. Oh yeah,
    We watched "Evil " smack the wall, at Snake River Canyon, on that Trip.

    Keep On a' Smokin' :cool:
     
  7. gas pumper
    Joined: Aug 13, 2007
    Posts: 2,953

    gas pumper
    Member

    Wellllll,,, My 235 in a 54 and two Roch B's can get 25 mpg on the highway. #52 in both. I had been as large as 68's and the mileage was down to 16. But the top end power was better being rich. Lean drives better for normal driving.
     

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