It may be interesting to note that connecting rod bearings, arguably the most critical bearings in an engine, may only receive intermittent pressurized oiling.
In many engines, the upper main bearing has a groove, that allows oil flow. The lower main bearing often has no groove, so there is no flow through the drilled crankshaft and into the rod bearings, when the crankshaft hole is not adjacent to the groove.
In years past, some connecting rods had no oil pressure feed, and used a "dipper" that would scoop oil from a curved trough. Some industrial diesel engines used splash lubrication to fill a scoop on the top of the rod bearing and gravity would get the oil in. Of course, lawn mower engines often don't have any form of oil pressure to the connecting rod.
A chevy rod "dipper" from the '40's
Find out what Honda [and Toyota] does, they have the lowest percentage of engine failures under warranty.
They use very high quality (well refined and often lighter) parts with superb metallurgy, machined to exacting tolerances, with precise fits. They also balance engines exceptionally well. In years past, it was obvious to a 4 year old child that Honda engine parts were higher quality than Chevy engine parts. Today, the difference is not quite so "self evident", but it still exists in many cases.
Also of note, in years past on many small Honda engines, rod bearings were seemingly as large in diameter as the pistons themselves.