VVT-i
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VVT-i, or Variable Valve Timing with intelligence, is an automobile variable valve timing technology developed by Toyota. It was introduced in 1995 with the 2JZ-GE engine found in the JZS155 Toyota Crown and Crown Majesta.
Cutaway view of Variable Valve Timing with intelligence on a ZR engine in Techniquest Glyndŵr
The 2ZZ-GE engine, the first and only engine to feature VVTL-i
The BEAMS 3S-GE 5th-generation engine ("Black Top"), the first to feature Dual VVT-i
The 1UR-FSE engine, the first to feature VVT-iE
Variable valve timing
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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. There are many ways in which this can be achieved, ranging from mechanical devices to electro-hydraulic and camless systems. Increasingly strict emissions regulations are causing many automotive manufacturers to use VVT systems.
Cylinder head of Honda K20Z3. This engine uses continuously variable timing for the inlet valves
Hydraulic vane-type phasers on a cut-out model of Hyundai T-GDI engine