Valvetronic is a designation for BMW engines equipped with a variable valve lift system. It is a system that, combined with variable valve timing, allows changing the position of the camshaft independently of the position of the crankshaft. It can also change the lift and length of time the valve is open.

This technology is used to optimize engine parameters. Thanks to the Valvetronic system, engines achieve higher performance, lower fuel consumption, and lower emissions.

MIVEC (Mitsubishi Innovative Valve Timing Electronic Control System) is a designation for the engines of the automobile company Mitsubishi, equipped with a system of variable valve timing and valve lift.

This valve control system is used to improve the engine's volumetric efficiency, thereby increasing engine performance and reducing fuel consumption and the amount of emissions produced.

Variable valve timing, or variable timing distribution, is a technology that allows optimizing the parameters of a four-stroke internal combustion engine, thereby increasing its performance and reducing fuel consumption.

With variable valve timing, it is possible to control the lift, valve opening moment or valve opening time, or a combination of the mentioned parameters, independently of the crankshaft position. However, the valve's control depends on the revolutions, engine load, and other factors.