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Old 07-13-2008, 08:49 PM
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I would have to agree with the rods being out of round, the crank not being balanced or the engine builder set it up with excessive clearance. If the bearings were set up at say .0045 to .005 play and a high pressure pump was used to compensate for the oil pressure drop I think you would see these patterns after some time.

It wouldn't be apparent right away but once the bearings started to wear the problem would get exponentially worse. Good thing you caught it when you did though or it would have ruined the crank eventually.
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