Air
Filter
An air filter is a metal or plastic housing, containing a
filter element, which removes dust and dirt from the air and
prevents it being drawn into the engine's cylinders. The filter element, usually made of pleated
cellulose fiber (a special kind of paper), needs to be replaced
at regular intervals. Rarely, oil-wetted foam or cotton filter
elements are used. Until the early 1960s, the oil-bath and
mesh type of air cleaner was widely used.
Some performance air filters, like those used by K&N are
washable and reusable. Often a performance air filter is the
easiest and cheapest way to improve power and increase fuel
efficiency.
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