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This is the engine that was converted from an old special tilt piston air compressor. This is the exact same principal from a certain type of "Air Hogs" plane engine. In the opener the engine was running at 35-50 psi and the second start was around 75-80 psi. Top RPMS so far is 1700 at 110 PSI. The timing still needs some work. Solenoid Valves with a Reed Switch and a Magnet are great ways of testing air/steam engines to perfect the timing. A slide valve will eventually be needed as the solenoid valve is rated at 100,000 - 1,000,000 cycles. This engine would wear it out in a day. The flywheel is wafer board (simple easy but not balanced or perfected). Not shown, top voltage from a permanent magnet motor (tread mill) 21 volts, top load 75 watts. The belt started slipping and the timing was hard to get back to perfect for the load. This engine will run 4 minutes on a full 10 gallon tank of air. The last minute is slow around 500 rpms to 50 rpms.