Quote:
Originally posted by svxwill
I use K&N filter but are thinking to go with a foam filter. and here is what i read from the foam filter website. true or bs
True Flow foam filters are made up to two part polyurethane foam. The composition of our 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.
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The problem with oiled foam filters, compared with dry paper filters is this. The dirty air enters from the bottom of the panel, the dirt is filtered by the under side of the panel. If it is a dry type, the larger particles fall off the under side of the filter, to lie in the bottom of the air box.
With a oiled foam panel, the dirt is sucked into the holes and stuck there by the oil. The larger particles are stuck there to block a larger area of the filter surface. Over time the foam filter will lose its capacity to flow air quicker than the dry type. As the air flow capacity reduces, the velocity of the air flow through the still open holes, will increase, to take oil with it, to coat the hot wire in the MAF sensor.
If you use a oiled foam filter, it must be cleaned more often, to ensure it still has its flow capacity.
Harvey.
