Originally Posted by
scifi
I think most engineers work on the principle that things should get better over time, so may set an initial high oil pressure, that will become good at 200 hours.
The other way is to set the correct pressure, then as the engine runs-in, increase the now low oil pressure. However it is easier to remove a shim, than to find a shim in the parts bin, to add one shim. It seems as if that C150 now has tight running clearances, I wonder if the correct non-detergent oil was used during the run-in period...?
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The first method seems like a match here as oil pressure is reportedly going down slowly over time. Taking apart piloting aspect of it prohibiting takeoffs at pressures outside of green arc, is that really healthy to run the new engine on a pressure that is 20 PSI lower than the end of the scale? How about risks to oil system components described by PDR?