What does i-vtec mean?

[KathrynFitz]

i-vtec is a variable valve timing and lift control technology. Functions of i-vtec: It uses a method similar to VANOS and VVT-i to continuously rotate the camshaft for opening and closing, thereby achieving control of the valve overlap angle. This means the timing and overlap duration of the intake and exhaust valves are variable and controlled by oil pressure through the VTC system. Working principle of i-vtec: When the engine shifts from low to high speed, the electronic control unit automatically directs oil pressure to a small turbine inside the intake camshaft drive gear. Under this pressure, the turbine rotates relative to the gear housing by a certain angle, causing the camshaft to rotate forward or backward within a 60-degree range. This adjusts the intake valve opening timing, enabling continuous valve timing control.