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Re:Show HN: A stop-motion video of an engine by fauria on Tuesday August 15, 2017 @03:50PM (#15021697)
This YouTube channel is fantastic: https://www.youtube.com/user/EngineeringExplained

It has videos on pretty much every aspect of engines, organized in handy playlists.

Re:Show HN: A stop-motion video of an engine by dave7 on Tuesday August 15, 2017 @04:32PM (#15022164)
Yeah he's great! My favorite on the more practical side of things is ChrisFix: https://www.youtube.com/user/PaintballOO7