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.

Yep, my Lawn Boy air filter is a piece of foam that you are supposed to soak with oil until "damp" (not dripping). This is just another inertial impactor filter, same general principle as a K&N.

Well, I've been watching this thread, and now that the attention has turned to small engines, I guess I'll throw my two cents in. We rent out a lot of small equipment, 90 percent of which has Honda GX series engines (it's their comercial grade small engine which is very similar to their old motorcyle engines). We have a lot of Concrete cutters, tampers, and other equipment that operates in dusty conditions. These engines use a prefilter that sits over a paper element, and pretty much every time I check they're filthy dirty, I mean, all kinds of stuff stuck to the filter foam, like mud, concrete dust, you name it. And as for the paper element???? Clean as a whistle. Even the intake and everything else is basically clean. Now, depending on where you guys might like to go, I'm sure some places have more dust than others, but I think it's a worthwhile investment. <img src="/forums/images/graemlins/smile.gif" alt="" /> <img src="/forums/images/graemlins/smile.gif" alt="" />
Now as for the way to oil these little filters, I don't know about the red or green ones, but I have a filter oil(actually motor oil will do, but hey, the companys flippin the bill so what the heck right???) I have a spray bottle full of oil, and when set to stream it gushes out nice, I soak it in good, work it in all the corners etc. then wring it out, THEN take a nice clean cloth and blot it, and that seems to work really well.


MAN!!!! This is starting to look like a Smiley post, (complete with parenthesis brackets and everything!!!) <img src="/forums/images/graemlins/smile.gif" alt="" /> Hope this helps some, Dave <img src="/forums/images/graemlins/cheers.gif" alt="" />(Smiley always uses this little guy too!!!!1 <img src="/forums/images/graemlins/kewl.gif" alt="" />