What Oil Does in Your Motorcycle Engine

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Seems to do the same thing that it did back in 1968 when I took High school auto shop.
 
Very good, but I have a minor issue with
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Today, the larger volume of oil flow through plain crank and rod bearings (not only lubricating but also cooling them)


Most of the heat there is generated there by viscous friction, to the point that oil generated heat typically flows INTO the block and Rod Big ends from the bearings. Yes the heat is largely removed by the oil, but it's largely responsible for the heat.

(At idle, and very low RPMS it's reversed for the mains, as they tend to pick up heat from the block at that point).
 
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