To conduct a complete engine life test is a very expensive venture. What is used instead is the multipass test. Basically the filters are hooked up to a test stand and 6606 aviation hydraulic fluid is ran through them. 6606 is the standard test fluid. Then, basically a "puff" of test dust is added to the flow of a known particle distribution. A particle counter down stream analyzes the distribution of particles that gets through the filter. The filter is then subject to a series of these cycles (hence multipass). There is a single pass test, but it isn't quite as realistic. You'd be surprised how accurate the test is. If the threads on the tap plate of the filter are not formed right, you will see that leakage in the results.
So, the short answer is that standard tests have been created to normalize data collected from one filter to the next.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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