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

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!