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On 17 Nov 2003 at 22:20, Greg Irick wrote: > Aircooled.net sells a tool that you use to clean up the oil piston > seating surface, > http://www.aircooled.net/new-bin/viewproductdetail.php?keyword2=TZE0029 I've got a lot of respect for John at Aircooled, but I've got to wonder how this could possibly be true. Since the piston only sits against the top of the bore when the pressure is extremely minimal, The only time this might have any effect at all would be at idle. I suppose if the top of your bore was poorly finished, you might get some improvement at idle, but once you're off idle nothing changes. Certainly there's nothing wrong with improving the idle oil pressure, but keep in mind that the load on everything is also minimal at idle, and your engine spends very little time there. Maybe I also need to take a look at how the dual valve cases are made. It's possible that the cooler bypass valve (the rear one) would benefit from such a cleanup. If that kept oil from leaking around the piston when the engine was hot, then it would put more flow thru the cooler and make the engine run somewhat cooler, which would up the pressure slightly at all rpms. I also can't be sure, but this looks like a lot of money for a pretty standard cutter. Does anyone know the diameter of the pistons or bores, off hand? I'd also have to know the depth of the bore. Hmmm, good food for thought.... -- Jim Adney jadney@vwtype3.org Madison, WI 53711-3054 USA ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org