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Ya lost me here, Jim. I understand the bypass valve, but if the pump outputs a constant volume for a given rpm then isn't pressure inconsequential to the flow of oil through the cooler? Toby Erkson air_cooled_nut@pobox.com <-- Please use this address for email '72 VW Squareback 1.6L bored and stroked to 2.0L, Berg five-speed '75 Porsche 914 1.8L, ORPCA member Portland, Oregon, http://www.geocities.com/MotorCity/8501/ >-----Original Message----- >I agree that there is no point in upping just the cold oil pressure, >and I also agree that when hot, the bypass valve (with the stronger >spring) will be (more) closed and the pressure will be higher. But I >think the important thing to understand that that this higher >pressure comes at the price of less flow through the cooler, hence >higher oil temp. ------------------------------------------------------------------- Too much? Digest! mailto:type3-d-request@vwtype3.org Subj=subscribe