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On 15 Sep 2002, at 22:17, Russ wolfe wrote: > Most filter paper that I know of, is synthetic. The porosity <sp> is the > main thing. Good filter paper should be about 30 microns. Any finer than > that, and it will cause too much back pressure on the pump. The number > of square inches of filter media is also important. > As for the Mobil 1 spec of 550 psi burst pressure, that is not very high > by automotive standards. We expect the rubber diaphrams in our pressure > regulators to withstand that much. We have a minimum of 250psi for 1 > minute, and then go up in increments of 20 psi every 10 sec.from there. > If they don't withstand at least 500 psi, we start looking for problems. > So 550 psi on metal can is not very much. What's the diameter of the diaphram? ie the inside diameter of the can? - ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ------------------------------------------------ To unsubscribe, E-mail to: <type3-off@vwtype3.org> For more help, see http://vwtype3.org/list/