VTEC (Variable Valve Timing and Lift Electronic Control) is a valvetrain
system developed by Honda to improve the volumetric efficiency of a
four-stroke internal combustion engine. This system uses two camshaft
profiles and electronically selects between the profiles. It was
invented by Honda R&D engineer Ikuo Kajitani. It can be said that
VTEC, the original Honda variable valve control system, originated
from REV (Revolution-modulated valve control) introduced on the CBR400
in 1983 known as HYPER VTEC. VTEC was the first system of its kind.
Different types of variable valve timing and lift control systems have
also been produced by other manufacturers (MIVEC from Mitsubishi, VVTL-i
from Toyota, VarioCam Plus from Porsche, VVL from Nissan, etc).
References : http://en.wikipedia.org/wiki/VTEC
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