Im particularly impressed by:
The biggest problem Millyard ran into was figuring out how to get the pistons and crank to all work together. Eventually, he came up with an idea inspired by rotary aircraft engines. Each piston in the front bank is mounted to a master connecting rod while the pistons in the rear bank are mounted to smaller, secondary rods connected to the mains. The master rods are all connected to a single crankshaft.
Well, shit. That's some brave ass engineering.