Honda’s variable valve timing system is called VTEC, short for Variable Valve Timing and Lift Electronic Control. It changes valve operation to suit different engine speeds and loads.
In its classic form, VTEC uses multiple camshaft profiles. At lower speeds, a milder profile supports stable running, drivability and economy. When operating conditions meet programmed thresholds, engine oil pressure moves a locking pin inside the rocker-arm assembly. The valves then follow a more aggressive profile, providing greater lift and duration for high-rpm airflow.
VTEC was developed by Honda engineer Ikuo Kajitani and introduced in a production automobile in the 1989 Honda Integra XSi, using the B16A engine. The technology helped smaller-displacement engines produce strong high-speed performance without making them excessively rough or inefficient at low speed.
MIVEC belongs to Mitsubishi, VANOS is associated with BMW, and VVT-i is Toyota’s system. Honda’s later i-VTEC combines VTEC with VTC, Honda’s continuously variable camshaft-timing control. Thus, VTEC is not merely a generic name for any variable valve timing system; it identifies Honda’s valve-lift and profile-switching technology.