EcoMotors International Opposed-Piston Opposed-Cylinder Engine
EcoMotors International has developed the OPOC engine - opposed-piston opposed-cylinder engine. This engine can run on a number of fuels and is lighter in weight and produces more power than a conventional engine.
The engine has 2 pistons per cylinder and multiple "units" can be coupled for a more powerful engine.
" ... demonstrate, in 2010, the automobile industry's first 5-passenger car capable of 100 mpg on the EPA highway cycle."
" ... ground-breaking internal combustion engine ... eliminates the cylinder-head and valve-train components ... lighter, more efficient and economical, with lower exhaust emissions compared with conventional designs...."
Via: EcoMotors International LINK