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Jim, unless someone beats me to it I will try to put something together on the operation of this engine; it is really pretty amazing.Dave
How it works:The engine settles with the piston at the bottom of the cylinder, so if you turn the flywheel a little the rack will lift the piston drawing in some gas and air. You now have a charged "cannon" ready for the ignition. The combustion of the gasses forces the piston with its rack up the cylinder, which in turn pushes the pinion round but to confuse matters the pinion is on a clutch and it free wheels in this direction As the gasses in the cylinder cool it forms a partial vacuum and it is this vacuum and the weight of the piston and its rod (rack) dropping which gives the engine its power as it now turns the pinion. As the piston reaches the bottom of its motion a rocker arm is pushed down by a pin on the rack which locks the ratchet mechanism allowing the eccentrics to turn. One of these eccentrics lifts the piston again and the other which is offset by 90 degrees moves the slide valve to open the gas and air. And so the cycle repeats JoP.S. The speed is regulated by the exhaust