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Originally Posted by cstreit
It's funny, I found some bits in the case that didn't look like they came from any engine part. It's almost as if there was some stuff dumped in the oil-tank. I know I sealed off the tank and engine orifices while the system was out for the winter, but I'm beginning to wonder if perhaps I didn't miss something.
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If the engine was out for overhaul, the oil tank and cooler should have been removed for ultrasonic cleaning and all of the oil lines disassembled and scrubbed out.
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Those spots DO seem like corrosion don't they. This car has oil changes with high-grade Mobil-1 racing formulation (Special barrel I got from a friend at Mobil-1) nearly every 5-10 hours of operation so what on earth could cause that?
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Many race-only oils do not contain ANY corrosion inhibitors and few antioxidants as they are intended as one-use-only products. Any change in humidity and/or temperature is sufficient for condensation that, combined with the byproducts of combustion, makes acids and thats precisely what you find after sitting.
I'd recommend draining that oil after each event to prevent recurrence.
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I guess an extremely good cleaning is in order. Looks like the bearings were sacrificial though and the crank was saved. By the amount of bearing flakes in the filter, it had been happening a while.
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Yessir, I think you are right on all counts,...