"Pressure below the membrane is needed. On the GSXR1100 model 92 with the 40mm carbs you have a seperate “venting” system with external hoses. Those are not suitable to pressurize. I removed that system, plugged the holes and drilled holes from the bellmouth towards under the diafram. When you drill you cross a not used hole. You have to plug that up also to prevent leakage and pressure drop. So it is made like the earlier models: the 36 and 38 mm CV carbs do not have this system."
The holes from bellmouth to under the diafram, what size should they be? Or is that not really important? Don't want to drill too big and f*ck up the carbs.
Nobody knows the answer?
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Post by captain chaos on Dec 17, 2013 20:04:36 GMT
that other kind of solution is something else, that's the float bowl pressurising.
On the 40's there's a separate venting system (between carbs 2 and 3) for under the membrane in the top of the carbs. That needs bypassing. 6mm holes your friend says, that's what i also thought would be good.
The big tubes with rubber T's that are about to be connected with the plenum on 40s in the picture in my last post are definitely vents below the membrane. Float chamber vents have much smaller hoses and are connected to the white plastic T-piece in engine side of the carbs on that photo.
Float chamber vents will not be connected just into the plenum like that, they should have their pressure from the pitot tube.
Very nice work mate. I have those 40's and they seems to be pretty easy to pressurize, just wondering myself that hole size. Keep those, they are newer and probably not so worn as some old 34 or 36 ones.