W12 Engine

A W12 engine is a twelve cylinder piston internal combustion engine in a W configuration. W12 engines are manufactured in two distinct configurations. One configuration uses four rows of three cylinders merged into two 'cylinder banks' (two narrow-angle VR6 engine blocks), coupled to a common crankshaft - as in the Volkswagen Group W12. The other uses three banks of four cylinders coupled to a common crankshaft - as in the Napier Lion.