Quote:
Originally Posted by engatwork
Got heads bolted back on this afternoon and noticed the rear lobe on the exh cam was boogered up some so I ordered another cam. I'm not that impressed with this engine. Am I being unrealistic comparing it to the 606 in longevity? I don't care if it is a gasser I would not have expected to see the cam lobes chewed up some.
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No, you're not in my opinion.
The variable displacement oil pumps are used in quite a few engines nowadays and, like you, I've always been a little queasy about their adoption.
I've noticed on the oil pressure gauges of more modern cars when at high-speed the oil pressure gauge is showing half scale readings. I kind of like looking down and seeing the oil pressure gauge at 80-90 PSI full scale readings like my 98 Dodge truck with the Cummins engine.
Of course there's no way to definitively prove the variable displacement oil pump was the cause of your cam wear, but I'd certainly say it's a possibility. When the engineers are calibrating the operation I'd guess they're more concerned about extracting an extra 2/10's of an MPG to comply with an EPA fleet mileage requirement than they are about the owner of the car 300K miles in the future.
As I recall if the sensor that measures oil pressure fails the pump is supposed to default to full-flow, maybe you could just unplug the right sensor and force it into full displacement?