Huh? The article mentioned it was a two-stroke engine: "But that’s only part of the story--the OPOC engine also features a two-stroke design. The benefit here

Huh? The article mentioned it was a two-stroke engine: "But that’s only part of the story--the OPOC engine also features a two-stroke design. The benefit here is that a two-stroke engine delivers a power pulse with every revolution of the crankshaft, as opposed to the four-stroke engine which fires each cylinder on every other revolution."