The way an oil bath air cleaner works is by gravity. The outside air flows down the inside of the housing and makes a 180 degree turn up into the fiber packing just above the oil, and any heavy dirt falls out from centrifugal force and gets trapped by the oil in the base. Finer particles get trapped in the fiber packing, which should have some type of light weight oil misted into it with a spray nozzle of some sort. It's the same concept the K&N filter uses, except they eliminated the oil reservoir and rely on an oil-covered woven packing to do the filtering. Neither one is very efficient- - - - -a proper sized dry paper filter is much better at keeping dirt out of an engine.
Jerry
