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  2. Variable valve timing - Wikipedia

    en.wikipedia.org/wiki/Variable_valve_timing

    Variable valve timing (VVT) is the process of altering the timing of a valve lift event in an internal combustion engine, and is often used to improve performance, fuel economy or emissions. It is increasingly being used in combination with variable valve lift systems.

  3. Variator (variable valve timing) - Wikipedia

    en.wikipedia.org/wiki/Variator_(variable_valve...

    The Alfa Romeo Twin Spark engine, introduced in the 1987 Alfa Romeo 75, also uses variable valve timing. [3] [4] The Alfa system varies the phase (not the duration) of the cam timing and operates on the inlet camshaft. [5] Alfa Romeo's variator is a cylindrical chamber that contains a pressure chamber and piston along with helical splines.

  4. Variable camshaft timing - Wikipedia

    en.wikipedia.org/wiki/Variable_camshaft_timing

    Variable camshaft timing (VCT) is an automobile variable valve timing technology developed by Ford. It allows for more optimum engine performance, reduced emissions, and increased fuel efficiency compared to engines with fixed camshafts.

  5. VVT-i - Wikipedia

    en.wikipedia.org/wiki/VVT-i

    Cutaway view of Variable Valve Timing with intelligence on a ZR engine in Techniquest Glyndŵr. VVT-i, or Variable Valve Timing with intelligence, is an automobile variable valve timing petrol engine technology manufactured by Toyota Group and used by brands Groupe PSA (Peugeot and Citroen), Toyota, Lexus, Scion, Daihatsu, Subaru, Aston Martin, Pontiac and Lotus Cars.

  6. N-VCT - Wikipedia

    en.wikipedia.org/wiki/N-VCT

    Nissan Variable Timing control [1] or Nissan Valve Timing Control System (commonly known as N-VTC, VTC, NVCS or NVTCS) is an automobile variable valve timing technology developed by Nissan. N-VTC was first introduced in 1987 on the VG30DE and VG20DET engine.

  7. Variable valve lift - Wikipedia

    en.wikipedia.org/wiki/Variable_valve_lift

    The system provides two-stage variable valve lift in addition to continuous variable timing. Continuously commanded by engine control unit, the valve rocker arm switches between high-lift and low-lift profiles on the camshaft, actuated by an oil control valve through a two-feed stationary hydraulic lash adjuster, allowing for either 4.0 or 10.5 ...

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