Variable valve timing
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Variable valve timing 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 increasin
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
VTEC
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Variable Valve Timing & Lift Electronic Control is a valve system developed by Honda to improve the volumetric efficiency of a four-stroke internal combustion engine, resulting in higher performance a
Variable valve timing
…was engineered by Ing Giampaolo Garcea in the 1970s. All Alfa Romeo Spider models from 1983 onward used electronic VVT. In 1989, Honda released the VTEC system. While the earlier Nissan NVCS alters the phasing of the camshaft, VTEC switches to a separate cam profile at high engine speeds to improve peak…
A Honda K24A Engine with i-VTEC
VTEC debuted in the B16A engine of the 1989 Honda Integra XSi.