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Has anyone tried a Progressive 2 Barrel?

Discussion in 'Performance' started by KCCats, Sep 30, 2018.

  1. KCCats

    KCCats Member

    I used to run a Weber Progressive 2 barrel carb!
    Great throttle response on a small single, and HUGE power when the almost double sized secondary would open!
    Just like an old linkage type 4 barrel!

    The problem is they were a down draft!

    Anyone know of a side draft 'Progressive' 2 Barrel carb?
     
  2. Weber probably makes one. But, I doubt that they have one in a low enough cfm rating. If you do the math, our little engines need about 75-cfm at 6000-rpm. (330-cc/revolution X 6000-rpm), and convert to cubic feet,
     
  3. KCCats

    KCCats Member

    HMM, but the primary was only like 28mm diam and Secondary 36mm.
    My carb is like a 46mm?
     
  4. matt167

    matt167 Member

    A single SU carburator from something like a 1275 MG Midget might work. They are actually single throat, but move a lot of air.. Finicky but work well when they are working well. Cars that get converted to a progressive 2bbl Weber actually go down in performance by quite a bit.. My other vehicle is a '74 MGB 1800 with twin SU's
     
  5. KCCats

    KCCats Member

    Well I am a Snowmobile Mechanic and the smaller single would give me better throttle response and I hope more torque down low?
    And these little 660cc 12 valve little motors really flow alot of air.
    I now have a header and 2" exhaust, with flow through turbo muffler.
    I think wide open it would really let it Hummm!

    I am also looking for the Arctic Cat 660 non turbo snowmobile.
    My 91 has a F6 and the Cat uses the newer K6 with the timing chain?
    The Cat 660efi is 80hp!

    There is a guy here (sorry cant remember) with the same motor with the Turbo @ 125hp!
     

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