We’re introduced to the traditional two-stroke diesel engine as thermally efficient but not smooth-running, and then the gas turbine as smooth but much more inefficient. The free piston engine ...

the engine is still running, just very slowly. While you may not be using the same amount of gas as you would while driving, piston strokes are still occurring, consuming gas all the same.

Meanwhile, diesels have oil jets that spray oil under the pistons to maintain sufficient lubrication at any rpm. But a large ...

Basically, two opposed pistons are rigidly connected to ... (on turbo-direct-injected high-pressure hydrogen). The engine's output on gasoline ranges from 80 to 148 hp). China’s Great Wall ...