As per our NAPA (WIX) filter rep when NAPA quit Purolator and got thier own brand (some time in the '60's or early '70's.) An "oil bath" filter is about 25% efficient at best. They work best at full throttle when the air is moving fastest. At low air speed, they are next to useless. The air changes direction as it passes over the oil cup, the dirt is thrown into the oil by centrifugal force, and held there. The mesh has a tiny bit of oil, but is mostly to catch the grasshoppers and such. There is no actual bath, but they were state-of-the-art long ago. Paper filters are about 95 to 98% efficient, and work at any volume or speed of air. In extremely dusty conditions we would mount an oil bath filter on top of a stack, and feed that into a FARR paper filter, the best at that time. Hope this helps.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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