What does VTEC mean?

[LaElijah]

VTEC is a valve control system. The following are specific details about VTEC: 1. VTEC stands for "Variable Valve Timing and Lift Electronic Control System" in Chinese. Compared to a regular engine, the VTEC engine differs in the number of cams and rocker arms and their control method. It has two different sets of valve drive cams for low-to-medium speed and high speed, which can be automatically switched via the electronic control system. 2. The working principle of VTEC is: when the engine shifts from low speed to high speed, the computer automatically directs oil pressure to a small turbine inside the intake camshaft drive gear. Under this pressure, the small turbine rotates a certain angle relative to the gear housing, causing the camshaft to rotate forward or backward within a 60-degree range, thereby changing the timing of the intake valve opening to achieve continuous valve adjustment. 3. The VTEC system's alteration of valve timing is still staged, meaning it changes the valve timing only at a certain RPM jump, rather than being continuously variable over a range of RPMs.