So, as I understand it, it combines the compression ignition of diesels with opposing pistons. The opposing pistons go toward one another and compress the air&#x2F;gas mixture and ignite it. The exhaust escapes when the pistons move back through ports machined in the sides (kind of like a wankel&#x2F;rotary engine removes exhaust gasses).<p>Sounds like they&#x27;re trading the spark system (a pretty easy to maintain system) for a second piston&#x2F;crankshaft&#x2F;etc. Essentially pulling out a cheap and perfected system for one that adds a bunch of high stress, expensive parts. Just from that sounds like a bad idea.<p>They say the extra efficiency comes from heat loss from the cylinder head, but I have a hard time believing they&#x27;re capturing that much extra (double-digits) efficiency from heat loss alone, especially given the reduced efficiency of having more moving parts.