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So, what I'm hearing you say, is a secondary oil cooler located in the loop of a full flow system (like the full flow oil filter) would be a good thing because: 1. Hot, thin oil from the sump will be pumped more easily from the oil pump (less hp needed from engine); 2. Oil after a secondary cooler will be nice and cool for the bearings and such; 3. If the secondary oil is too cool it will bypass the stock cooler, thus allowing the engine to run at it's best temp, and; 4. A stiffer bypass spring is good only for cold pressure problems and, more than likely, indicates other problems. Through my work I've seen that the stock springs are good "as is" and there's no need to mess with 'em. Thanks for your input :) 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 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? > >With constant TOTAL flow, the higher the pressure, the more that will >be bypassed AROUND the cooler (because the bypass valve responds to >pressure, not temp.) This could be attacked by adding a stiffer >bypass spring, but you can see that the problem is not really so >simple and since the oil galley pressure is not really that >important, why bother. I just wastes power (power consumed in the >oil pump = pressure x volume/sec.) ------------------------------------------------------------------- List info at http://www.vwtype3.org/list or mailto:help@vwtype3.org