Quote:
Originally Posted by Superman
Actually, air filters have PLENTY of surface area and they breathe just fine when dirty. In fact, they filter out dirt better when dirty. Heavy equipment manufacturers look at air filters on diesel equipment that are clogged with inches of debris, and suggest it be left in service.
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Correct but only up to a point. Eventually the filter clogs too much. Air finds a way around bringing dirt with it. You can put a thin smear of grease in air box past filter to see when dirt gets on it. The miles and miles of mountain washboard dirt roads around here don’t do small filter areas any favors. Also, under max power when the EFI runs in open loop (almost all EFI systems) it is expecting to match the pre-programmed fuel maps to a clean filter so economy can suffer in this scenario.