Although they still exist, 2-stroke diesel engines aren't all that common, and 4-stroke engines are what you'll commonly see ...

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 4-stroke Detroit Diesel engine ended up retiring and eventually replacing its 2-stroke counterpart, but it'll be a long time before people forget about the legacy it left behind. Read more ...