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I'm only on my second model but hope to get to more complex units as my skill level allows. As I look at multi cylinder models I wonder how lubrication is catered for. Many have exposed crankshafts, particularly I/C engines, so a sump wouldn't work. Some thoughts would be appreciated...

I am building an opposed piston engine which I downloaded. It has its origins in the December 1977 issue of Popular Science. On the drawings it has a number of letters inside a small circle. These paper adjacent to dimensions. they are (separately) a C, an S, and a P. Can anyone enlighten...