It's not even the worst 3.0-liter Duramax we've seen, lest we forget the destroyed diesel that literally had valve shapes stamped into the pistons. But we've never seen a hole in the cylinder ...

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 ...

This has been the case with so-called free piston engines. In its most basic form, the piston in a free piston engine simply oscillates back and forth driven by the alternating combustion energy ...