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?
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,
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
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!
