You have likely heard of variable valve timing by one of the names manufacturers have for the system, such as VVT-i or VTEC.

The inlet and exhaust valve timing of a piston engine plays a large role in engine performance. Many modern automotive engines have some sort of variable valve timing, but the valves are still mech… ...

Like the GM and Ford implementations, the single-cam pushrod engine relies on a control valve/solenoid and a phaser. ... It is possible to vary the exhaust timing up to 45 degrees, ...

You'll also find them in emissions control systems, managing exhaust gas recirculation (EGR), and in Honda VTEC and Toyota VVT-I variable valve timing (VVT) systems.In the Chrysler 5.7-liter HEMI ...

Variable valve timing and lift Somewhere there's a perfect balance between peak horsepower, low-speed response, reduced emissions, and something you can afford. MotorTrend ...

Specifically, that allowed Porsche to alters the intake valves' timing relative to the position of the pistons in the cylinder as well as the timing of the exhaust valves.

Auburn Hills, Michigan: BorgWarner launched variable cam timing (VCT) system, which will improve engine efficiency and fuel economy for the new Hyundai Gamma II engine. The 1.6-liter I4 gasoline ...