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2. VVT-i - Wikipedia

   en.wikipedia.org/wiki/VVT-i

   VVTL-i (Variable Valve Timing and Lift intelligent system) (also sometimes denoted as VVT-iL or Variable Valve Timing and Intelligence with Lift) is an enhanced version of VVT-i that can alter valve lift (and duration) as well as valve timing. It was introduced with the 16-valve 2ZZ-GE engine found in the 1999 Toyota Celica.

3. 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.

4. Variable valve lift - Wikipedia

   en.wikipedia.org/wiki/Variable_valve_lift

   Variable valve lift (VVL) is an automotive piston engine technology which varies the height a valve opens in order to improve performance, fuel economy or emissions. There are two main types of VVL: discrete, which employs fixed valve lift amounts, and continuous, which is able to vary the amount of lift.

5. Variator (variable valve timing) - Wikipedia

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

   One of the first practical VVT systems used a variator to change the phase [note 1] of the camshaft and valves. This simple system cannot change the duration of the valve opening, or their lift. [note 2] Later VVT systems, such as the helical camshaft or the movable fulcrum systems, could change these factors too. Despite this limitation, the ...

6. Nissan VVL engine - Wikipedia

   en.wikipedia.org/wiki/Nissan_VVL_engine

   Nissan Ecology Oriented Variable Valve Lift and Timing (commonly known as VVL & VVT) is an automobile variable valve timing technology developed by Nissan. VVL varies the duration, and lift of valves by using hydraulic pressure switch between two different sets of camshaft lobes. VVT varies the valve timing throughout the RPM range.

7. MultiAir - Wikipedia

   en.wikipedia.org/wiki/MultiAir

   Fiat 875 cc two cylinder TwinAir engine featuring Multiair technology. MultiAir or Multiair is a hydraulically-actuated variable valve timing (VVT) and variable valve lift (VVL) engine technology enabling "cylinder by cylinder, stroke by stroke" [1] control of intake air directly via a gasoline engine's inlet valves.