We all know how a conventional internal combustion engine works, with a piston and a crankshaft. But that’s by no means the only way to make an engine, and one of the slightly more unusual ...

piston strokes are still occurring, consuming gas all the same. You can't generate energy for free, unfortunately, even if you're not actively using it. If you were to leave your car's engine ...

These engines mimic the function of an internal combustion engine, with each solenoid acting as a piston. The only problem ... While the small car doesn’t have steering and only goes at a ...