Four Cylinder Air Engine, Experimental

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A few months back (February 2017) I posted a slow-motion video of a four-cylinder air engine on my YouTube channel (https://www.youtube.com/user/popzct0214/videos). Before shelving it, I experimented with the design to meet its weight and airflow demands. The engine is now online, so here are the STL files. Keep in mind that this engine is experimental, requiring precision filing and fine adjustments if you decide to print and experiment with it. This design uses a spinning rotor to direct air into each of the four cylinders. The rotor has four holes spaced equally along its length, rotated 90 degrees from one another. "Gear Crankshaft.stl" and "Gear Rotor.stl" maintain synchronization between the rotor and crankshaft to ensure air reaches the cylinders at the right time. This design relies on cylinder blow-by for exhaust, making it less efficient but an interesting conversation piece. As usual, I probably missed a file or two, so feel free to ask questions if needed. I make mistakes often, so don't hesitate to clarify any doubts. Designed with Autodesk Fusion 360, sliced using Cura 2.7.0, and printed in PLA on an Ultimaker 2+ Extended and a dual-extrusion Ultimaker 3 Extended.