VTEC/I-VTEC: What Does It Mean, How Does It Work?
VTEC stands for Variable valve Timing and lift Electronic Control. The "I" in I-VTEC (or "i-VTEC," as Honda styles it) stands for "intelligent."
The "intelligent" I-VTEC system uses Variable Timing Control (VTC) to adjust "camshaft phasing." By varying oil pressure, VTC can continuously vary intake timing relative to the engine's exhaust timing. The result of I-VTEC is improved response and enhanced performance at low engine speeds and efficiency across a broad power band.