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Old 04-09-2008, 12:13 AM   #33 (permalink)
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Quote:
Originally Posted by Big Dave View Post
The subject of air filters has been studied to death by trucking companies, railroads and river towboat operators. Literally thousands of studies, done over decades.

The unanimous conclusion: A paper air filter puts the cleanest air into your engine. Oiled fiberglass lets much more dirt into your engine. Dirt equals wear and engine parts are much more expensive than fuel.

Further, a paper filter gets more efficient at removing dirt as it builds us a “cake” of air on its intake side. In fact, it is most effective as a filter just before it plugs up entirely. Some industrial operators will dust on some lime before they install an air filter to get a “starter cake.” A K&N gets less efficient as it builds up a cake, because as the sticky surfaces are fouled, they just let the dirt zoom on through.
I work for the one of the few filter media manufacturing companies that supplies Baldwin filters with the paper (which can contain both wood pulp and glass fibers in the same filter) that they make their filters with. The only thing that needs to be corrected about Big Dave's statement is the oiled fiberglass part. First, it is cotton gauze that most "high flow" filters are made of. Secondly, Fiberglass, mainly microfibers, are used to increase efficiency. By efficiency, I mean ability to contain particles of a smaller size. Generally a filter's efficiency is inversely proportional to it's capacity. So, one cannot have his cake and eat it too . Congrats to Big Dave to an otherwise flawless post .
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