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#711346 - 10/12/17 7:18 pm Supercharger & SU with no float bowl  
Joined: Feb 2011
Posts: 35
mangold Offline
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mangold  Offline
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Joined: Feb 2011
Posts: 35
Sacramento, CA
It seems that in just about every photo of a supercharged drag racing triumph I've seen there's a gravity-fed SU carb with no float bowl. The few modern videos I've come across show motorcycles that run smoothly from 1/8 throttle to WOT. Anyone have insights into how this is accomplished or what additional modifications to carb/fuel system might need to be made to get it to work well?

#711352 - 10/12/17 7:40 pm Re: Supercharger & SU with no float bowl [Re: mangold]  
Joined: Aug 2015
Posts: 891
Andy Higham Online content
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Andy Higham  Online Content
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Joined: Aug 2015
Posts: 891
Bolton Lancs UK
Most will be running on methanol and varying percentages of nitromethane. The float bowl will not pass enough fuel.
The start procedure is to momentarily turn on the fuel and lift the slide then start the engine, as soon as the engine fires turn the fuel on.
Supercharged methanol engines do not like part throttle, they tend to "hunt" but snatch the throttle open and the "hit" is instant


1955 BSA B31 400cc "Stargazer"
1962 Greeves 200cc "Blue Meanie"
1962/67 Greeves 350cc
1967 Greeves 360cc Challenger
1984 Suzuki GSX1100 EFE "Sorcerers Apprentice"
Modified Nu-Trak GM500cc sprint/LSR bike "Deofol"
2003 Aprilia RSV Mille "Lo Stregone"

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