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I realized that we have a thread for transmissions and final drives, but not for engines. I'll start with this post about the Japanese 10 ZF engine from the Type 74 tank. As far as I know, not much has been published in English about this engine. It's a rather interesting one in that it's an air-cooled 2 stroke diesel.
Piston engines have been doing a good job of converting chemical energy into mechanical work for about a century and a half now, but this hasn't stopped various people from trying to seal a pressure-bearing volume that isn't cylindrical. So far only Felix Wankel and Mazda have really pulled it off, but there will always be dreamers: https://www.youtube.com/watch?v=k7R9xXPfIio And then there's this thing, which I guess has pistons but the pistons spin in a circle: