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BTW is anybody here old enough to remember the old "oil bath"-type air filters found on some old small engines and even very old cars? It consisted of a pool of oil; incoming air was forced to make a 180 degree turn just above the oil. Much of the particulates in the air would carry forward and land in the oil. Another crude form of inertial impactor...

This theory continues in today's filters, although on a more microscopic scale.....

From autotoys.com:
"True Flow foam filters are made up to two part polyurethane foam. The composition of foam filters is a series of tiny interlocking cells of uniform size without straight through passageways, that create an impossible journey for dirt particles. Each passageway is like hundreds of very small oil bath filters or cells connected one to another. The cell strands stop the dirt, while the oil film holds the dirt like fly paper until removed when the filter is cleaned. This is why foam filters are referred to as full depth filters. Foam filters are over 12 times thicker than paper or gauze elements, which are screens, or surface type filters."

Just some more food for thought.

Last edited by rheteric; 11/03/04 05:45 PM.
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