I don't see how they can say this is a 4 cycle engine. It looks like a fancy 2 cycle engine to me... http://www.ecomotors.com/ But it's going to save the world! http://www.xconomy.com/detroit/2010/11/01/khosla-gates-are-betting-on-ecomotors-engine-technology-to-transform-autos-into-cleaner-cheaper-and-more-powerful-machines/?single_page=true