Thread: CB desert sled
View Single Post
Old 01-23-2013, 03:57 PM   #280
motorcycle addict
kellymac530's Avatar
Joined: Feb 2010
Location: so. cal.
Oddometer: 1,052

2 things to think about on the inlet/outlet size is that a carburetor works off of flow of air...which is created by the vacum of the cylinder on INTAKE stroke. I believe that motor fires in 4 fires, not 2, so only one induction at a time. The inlet being 2" and each carb outlet being 1" means it never needs more than 1" of air at a time.

The second thing, which kind of offsets that, is that you DO want a larger and unrestricted flow before the carb...think of a velocity stack. That is import at WOT where a smooth, high flow is key.

So a balance of the 2 is important and that is calcuable.

People need to remember that in cylindrycal shapes doubling the diameter is not just twice as much....Pi x r2

I do not know the formula for his optimal inlet size, but he WELL MAY be just fine.
it is easier to ask for forgiveness than permission
kellymac530 is offline   Reply With Quote