Opposed Piston Engine to Enter Test

It's an interesting technology, and they are putting two of these engines in an FMTV truck. (Full disclosure, in 1992-1993, I worked at Stewart and Stevenson, Tactical Vehicle Systems on the FMTV trucks.)

If you look at the picture (below) it appears complex, but there are no valves, just ports (look closely at the bottom of the cylinder.), so all in all, it's likely no more complex than a conventional engine.

It also has a high power to weight and power to displacement ratio because it is a two stroke, though this leads me to wonder about pollution levels, as two stroke engines are typically more polluting (GM's locomotive division, EMD dumped it's very reliable and mature two stroke diesels about a decade ago for this reason), which may put a stake through the heart of this concept.