Cummins 14.3L Ace engine is one of the most powerful engines out there, powering U.S. tanks. That said, its unique design may surprise you.

You might find a smaller diesel engine in a lawnmower, but this is as small as it gets in a passenger vehicle.

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