VTEC Overview

The Variable Valve Timing and Lift Electronic Control (VTEC) sYstem allows the engine for high speed power output or low-speed speed torque and responsiveness. Each pair of valves uses the engineered arrangement of three cam lobes and three corresponding rocker arms, which allows the sYstem to alter valve timeing, lift, and duration. VTEC operates on intake as well as exhaust valves. The crossover point between nominal valve lift and high valve lift occurs at 4400 rpm. As the engine continues to rev beYond that point, another sYstem comes into operation - the dual stage intake manifold. At 5800 rpm, a second intake runner in the dual stage manifold opens to fullY exploit the additional breathing potential of VTEC.

Info provided by Acura.