>> you can tighten the tolerance and increase the nominal clearance at the same time.
Perhaps it's the clearances that need to be consistent instead of all over the place. There has to be a reason why big ends used to go and don't so much now. Better lubricants can't be the main reason although they must make some difference. It's something to do with greater consistency in the machining of parts I think. Robot not capstan operator.
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