i-VTEC

(intelligent-VTEC)  has VTC (Variable Valve Timing Control) which introduced continuously variable timing of camshaft phasing on the intake camshaft of DOHC VTEC engines. The technology first appeared on Honda's K-series four cylinder engine family in 2001 (2002 in the U.S.). In the United States, Honda first debuted the technology on the 2002 Honda CR-V.

VTC controls the timing of valve lift and the timing of valve duration are still limited to distinct low- and high-RPM profiles, but the timing of the intake camshaft is now capable of advancing between 25 and 50 degrees (depending upon engine configuration) during operation. The timing of the VTC intake camshaft phasing changes are implemented by a computer controlled, oil driven adjustable cam gear. Phasing is determined by a combination of engine load and rpm, ranging from fully retarded at idle to somewhat advanced at full throttle and low RPM. The effect is further optimization of torque output, especially at low and midrange RPM. There are two types of i-VTEC K series engines which are explained in the next paragraph.