Less fuel and emissions, more power, higher revs. EcoMotors' OPOC engine promised it all. Investors, including Bill Gates, gave money. And lost money.

While the Scuderi Split-cycle engine may be very new (his patent was filed in July 2001), it is based on a design that's been ...

Porsche's new patented six stroke engine might not be a thing of reality yet, but the new technology is still very ...