James, you first introduced me to the concept that high-performance engines are designed to burn through a lot of oil on purpose - a liter every 1600km. I understood in general, but this in-depth analysis goes into great detail about the way a piston ring exerts pressure on the cylinder wall, and how the lower rings are cleverly designed to scrape oil and deposits off the cylinder walls.
You can skip to 3:56 after the discussion of steam-engine piston rings.
6:26 I didn't realize that combustion pressure forces its way behind the inner diameter of a piston ring, pushing the ring against the cylinder wall.
7:39 I also didn't realize that piston rings convey half the heat from the piston to the cylinder wall.
14:23 graphite-steel is stronger, and chrome or other minerals are deposited onto the surface of the piston ring to enhance strength and wear-resistance.
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