An energy transducer comprising: a cylinder; a piston within the cylinder connected to a connecting rod extending out of the cylinder and connected to a crankshaft; a chamber within the cylinder defined by the first end of the cylinder and the piston; a direct injector in fluid communication with the chamber and in fluid communication with a fuel tank such that the direct injector is capable of injecting fuel from the fuel tank into the chamber, where the fuel is hydrogen or a mix of hydrogen and oxygen; and an igniter located such that the igniter is capable of igniting the fuel within the chamber; such that ignition of the fuel within the chamber causes an explosion that forces the piston toward the crankshaft, causing the crankshaft to rotate 180°, followed by an implosion that forces the piston away from the crankshaft, causing the crankshaft to complete one full rotation.