What do you gain by installing a K/N filter direct to the carb Is this ok to do? Anyone know what a velocity tube is?

 

Ah, so someone finally questions intake tract length.

There is a math formula that is used to calculate the proper length of the intake tract. The length is important because it must match the operating rpm range of the engine.

Generally, the shorter the tract, the higher the intended rpm range. That is usually why people who install flat slide carbs appear to get a higher rpm range (not counting the larger bore size). The flat slide is usually a shorter carb length.

When you measure your intake length, you include such things as the intake runner, carb length and, of all things, the length to the open air cleaner. In your case, going straight to the carb will shorten the entire tract.

On the velocity tube, what that does is "columize the air" accelerate air. It helps when there is a low air speed problem at a certain rpm range. I use then before and after the carbs in many applications.