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On 12 Sep 2002, at 20:43, Keith Park wrote: > But since we never see more than 80 to 100psi from our pumps... how can even > a stuck valve cause it to burst?? It would have to be a really woosy filter > design to fail at such a low pressure. Many cars have alot more oil > pressure than ours. Berg claims pressures above 200 psi with high rpms and cold oil. I don't know WHY anyone would do this to his engine, but there's always someone. Then consider what Berg thinks of as cold and what Keith and I see every winter! I built up my winter engine with the pressure relief pump cover for this very reason. For most cars driving moderately for the first few minutes to allow for engine warmup is probably sufficient, and always prudent. Even at 100 psi, there is over 1200 lbs of force trying to tear that filter cup off it's end plate. Those sq. inches tend to add up quickly! Brian, where did your filters fail? Did they just deform and leak at the seal, or did the crimp come apart? - ******************************* 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/