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A '''V12''' is an [[internal combustion engine]] with 12 [[cylinder]]s in [[V engine|V]] [[engine configuration|configuration]]. Like a [[straight-6]], this configuration has perfect primary and secondary balance no matter which V angle is used and therefore needs no [[balance shaft]]s.
A V12, with two banks of six cylinders angled at 60° from each other, has even firing with power pulses delivered twice as often per revolution as, and is much smoother than, a [[straight-6]]. This allows for great refinement in a luxury car; in a racing car, the rotating parts can be made much lighter and thus more responsive, since there is no need to use counterweights on the crankshaft as is needed in a 90° V8 and less need for the inertial mass in a [[flywheel]] to smooth out the power delivery. In a large, heavy-duty engine, a V12 can run slower than smaller engines, prolonging engine life.
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