A V12 engine is a twelve-cylinder piston engine where two banks of six cylinders are arranged in a V configuration around a common crankshaft. V12 engines are more common than V10 engines. However, they are less common than V8 engines.
1991 Porsche 3512 Formula One engine
1904 Craig-Dörwald racing boat engine
Two large marine engines
1917 Liberty L-12 airplane engine
A V engine, sometimes called a Vee engine, is a common configuration for internal combustion engines. It consists of two cylinder banks—usually with the same number of cylinders in each bank—connected to a common crankshaft. These cylinder banks are arranged at an angle to each other, so that the banks form a "V" shape when viewed from the front of the engine.
V-twin motorcycle engine (circa 1910)
V6 car engine (circa 1990)
V-angle illustrated by the yellow lines
Argus As 10 inverted engine