February 14, 200719 yr Author Hi Guys I said I would report back. Ram supplied new pistons valves seats springs etc, and the engine was re bored and assembled. It sounds very sweet now………..But……………… the oil pressure is off the clock!! On tick over it reads 4 Bar, but as soon as you rev it the pressure goes to 10 Bar and starts to leak oil from the crank seal. Any Info would be great as now I am desperate!!!! Regards Paul
February 15, 200719 yr You put the bearing shells in the right way? If you put them in without lining up the oil holes, you could be getting high pressure.
February 15, 200719 yr Author Thanks for the tip and I have been assured that they were lined up. any more Ideas please!
February 15, 200719 yr Idea only. bypass valve in the oil pump is stuck. see blow up of oil pump in the FSM
February 15, 200719 yr Author 20/50 oil. Bypass... OK ill look at that this weekend, thanks. Sorry........ whats FSM? Paul
February 15, 200719 yr Factory Service Manual This spring loaded check ball valve controls the max oil pressure. By the way these engines when worn in are known for having a flutuating oil pressure. ~0 -->5 bar is not uncommon
February 15, 200719 yr 20/50 is some serious oil, and until it gets to running temperature will generate pressures in excess of 10 bar, particularly when you add in the extra plumbing of a dry sump system. Does it remain that high after the engine has been running to operating temp? Is that even possible on the ground? ... yeah, I'm not an airplane guy.
February 15, 200719 yr Author FSM= Me Dumb! Thanks. Ref 20/50, at tick over only 4bar, and not got to operating temp yet because of pressure. Paul
February 16, 200719 yr If all the clearances are to spec, then try dumping the 20/50 and put in some 10/30 oil. The difference in thickness just may make a difference in oil pressure.
February 17, 200719 yr Chip, The dry sump sysytem is a relative unknown here. We for the most part are guessing. Could the bypass passage from the oil pump pressure regulator be blocked somehow? I would like to know what brand name the system is and who plumbed it? Maybe a description of the system, as I have a custom install that may require this. BTW I run 20w/ 50 in all my Subarus (about a dozen) but my VDC H6 I have never blown a seal.when the PVC system was functional. Sounds like you have covered that base. A Porsche board may be a better solution.
February 17, 200719 yr Author Hi Skip, Yeh its a bit of a poser for me too! Header Tank, feads oil pump. Sump feads oil cooler. Oil cooler feads header tank. New pistons, valves,springs, guides and re-bore. Blows seals!!!! Paul
February 18, 200719 yr Where is the "oil pump", on the engine? Sits alone? Part of the oil tank? Please PM or email me, I need more info. I do want to help.
February 18, 200719 yr Author Hi Skip thanks for the responce as you know, it gets frustrating when everything you do ends in oil everywere! I will take some photos of installation today and send to help understand. The oil pump is part of the engine. Regards Paul P.S. have hopfuly sent this to you as PM also.
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