He says lubricated before engine startup. I imagine it has solid lifters/pushrods, so no oil that way. It would have to be dripped on (like REALLY old engines) with the extra just falling/slinging off. I have some stationary engines at work that oil that way, not a messy as you think. Open valvetrain too. You have quite bit faster wear though, compared to modern valvetrain. I think this was done for shop art, not actually for a airplane.Cool!!! I wonder how the rockers are lubricated?
Cool. I wasn't aware that someone was doing a replica of the Douglas World Cruiser. My grandfather was slated to be the pilot of one of the four World Cruisers, but late in the program, Army brass decided that it would be better PR if all of the pilots were commissioned officers; my grandfather was a flying NCO.