Solenoid engine basically working on the electromagnetic attraction.It is an electromagnetic device whichmoves the plunger as per the coil magnetism and no pollution into the atmosphere.
source/image: Maker B
In this video I’m modifying and testing a 9 cylinder radial solenoid engine.Here you can also see inside the crankcase as the engine is running.
The principle of the solenoid engine is simple. Cylinders are wound with coils to act as solenoids, with the piston acting as the armature. When the solenoid is energised, it pulls the piston into the cylinder.
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This micro engine has 9 solenoid cylinders produced with basic hand-operated machine tools, aluminium and brass are carefully crafted into the various components of the motor, and parts are delicately assembled with small fasteners and plenty of retaining compound.