people sometimes say engines are made now with tighter (closer) tolerances. Is that really true? compared tp 1920 , yes but compared to 1985 have there been many changes in main bearing or rod bearing clearances ?
seems they were back then less than 0.001? like maybe 0.0005? are they still in that range?
and what about piston to cylinder bore clearances? changes there? or not
anyone got any real numbers?
I would think modern engine life might be due to other factors- maybe better oil and maybe better quality control
seems they were back then less than 0.001? like maybe 0.0005? are they still in that range?
and what about piston to cylinder bore clearances? changes there? or not
anyone got any real numbers?
I would think modern engine life might be due to other factors- maybe better oil and maybe better quality control
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