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Simply installing a larger bearing seems pretty limited outlook for thease world famous engineers it seems.
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By that time the 9a1 was already a reality. They knew that the crankcase would go away in 2008, and the easiest way to address the issues that were occurring at low engine speeds was to increase bearing diameter, increase surface speeds and reduce load the bearing sees.
Reinventing the wheel for only 2-3 years didn't make any sense. They didn't even alter the crankcase, if they did we'd be able to retrofit M97 bearings, too.