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Jim, On thought #1, please define "our pressures" and "most engines". Are you speaking 'T3 engine vs. all other air-cooled VW engines' or are you speaking 'all air-cooled engines vs. other water-cooled engines of the same era'? Interesting info about the oil pressure, both the hydrodynamics and pressure sensor location. I thought that the pressure sensor for the T3, from my reading of the flow diagrams in the manuals, was directly before the input side of the oil cooler. If this is true, it wouldn't matter if the sensor was placed there (in the stock location) or on the side of the case, right? If you are correct, then wouldn't it be more accurate to place the pressure sensor in the galley along the side of the case? 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 '95 VW Jetta III GL 2.0L, P-Chipped, Jamex sport suspension Portland, Oregonî†K‡/www.pobox.com/~toby_erkson/ >-----Original Message----- >1) Did you realize that our pressures are always "low" compared to >what most engines measure? > >Part of that is just due to where the pressure is measured: after the >cooler for us, before the filter for them (I think). Part is due to >the fact that we just do with less pressure. This is consistent with >the fact that the only pressure the engine needs at this point is >that necessary to get the oil to the bearings. The actual pressure >necessary for lubrication is generated hydrodynamically within the >bearing by the motion of the journal within the bearing--this >pressure is NOT dependent on input pressure, although it IS increased >by FLOW in and decreased by wide clearances that increase flow OUT. ------------------------------------------------------------------- Too much? Digest! mailto:type3-d-request@vwtype3.org Subj=subscribe