A velocity stack has to be one of the coolest-named parts that I am never going to put on any of my bikes. I do have a question, though.
I saw this bike on Pittsburgh craigslist; once upon a time it was a Honda 550, and now has a velocity stack on each of its carbs. I've seen discussions here about putting one on a moped carb.
So far, the best description of its intended purpose I've gotten is that a velocity stack smooths the airflow into the carburetor.
So, question: I can see that on a bike like the 550 above, two carbs pulling in a huge amount of air could cause turbulence near the intake, and decrease performance. It seems that if you have that much airflow, though, you're going to be sucking up other stuff too - leaves, twigs, rocks, dust.
Wouldn't you want to put a velocity stack inline with a large capacity air filter? I imagine that a bike's restrictive stock filter would make the velocity stack worthless, but what if you put on a huge ring filter (like one from a car) - wouldn't you still see the same performance gain (if any) without getting stuff in your engine?
