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Subject: Re: Fw: [T3] Those with Gene Berg full-flow kit - Question > On 10 Jun 2001, at 17:16, Russ Wolfe wrote: > > > > Filters are designed to filter from the outside in. This gives more surface > > area. Imagine a roll of toilet paper. More area on the outside. > > Okay, I went down and actually looked at one and, of course, Russ > is right, the oil goes in the outside. I don't buy the area argument, > however. The element is a pleated sheet of paper; both sides have > the same area. > > BUT, when the "paper pack" (that is what is called in the trade) is formed, the inside pleats are compressed fairly tightly together. Therefore, there is actually smaller area exposed to the fluid that is being filtered. On the outside of the pack, the pleats are fanned out, exposing the entire surface area. Most filters when designed, have a "surface area" specified in square inches. This works out to a certain number of pleats +/-. We have a spec on ours +/- 2 pleats, and we try to hold it to the + side. There are a few fuel filters, that because of the way they have to be install, that they filter from the inside out, but they are designed to operate in this mode, and the pleats are more open on the inside. Russ Wolfe russw@classicvw.org http://www.classicvw.org/ ------------------------------------------------------------------- Unsubscribe? mailto:type3-request@vwtype3.org, Subject: unsubscribe