Originally Posted by Sarge
Ramflo
The filters really do not need to be oiled like the K&N. The whole idea of these filters is to allow the carb to breathe straight into the throats as the carb was designed to work. If you want any clue as to any difference, run without a filter once in a clean area free of dust. Most Webers run awesome without a filter, in fact a lot of the SCCA guys used to do just that as well as remove the choke blades. Some even went as far as to cut the choke housing's casting off and taper the top of the carb, much like modern day Dominators. The K&N design of having to go "up and over" that choke housing kills the carbs efficiency pretty fast. The biggest effect is WOT, but some drivability issues also show up as well as overall economy. Some guys have done comparison tests with the K&N and Ramflo side-by-side on twin side draft carbs. The Ramflo two cylinders ran much cleaner on the plugs and had much less "backwash" show up in the carb. Those carbs are seriously affected by air flow direction, they must breathe straight in to work properly.