Why do some carbs flood and others don't?

[overdrivesteve]

Hi,
another post ended with the words, "you also won't have flooding out issues when off roading." which got me to thinking...
I'm far from a carb expert and its probably my weakest link, but I have always wondered, why does an off-road truck carb flood out but the carb on an off-road bike doesn't? I've seen some off-road bikes take some extreme angles, and with some intense vibration, but a truck doing half that angle will choke and flood out. Why can't the same principles be applied or modifications be done to an off-road truck carb as to an off-road bike's carb?
Thanks.
Steve

 

[1975IH200]

Another post ended with the words "you also won't have flooding out issues when off-roading."

the post was talking about fuel injection....

Motorcycle carbs are typically slide-valve carbs, completely different than automobile carbs.
You could custom install a motorcycle carb or two on your truck if you had the mind to.
I have seen one and it works.

 

[FDChappie]

Some carbs do and others don't. The 2210 that came on my Scout has never missed a beat when wheeling even at crazy scary angles. I believe that the flooding issue is primarily a design issue.

If you think about it a motorcycle carb has a float that almost fills the bowl, hence it is always in the fuel. A carb with a big fuel bowl and a small float that's not located in the center bowl would be much more likely to flood at an angle.

Another factor is float buoyancy vs. Weight. If you've got a heavy float that sits low in the fuel and hit a bump it will be a fairly long time before the float rises back up in the fuel and shuts off the supply. Now you're flooded.