VTEC is a system developed to volumetric efficiency of an internal combustion engine four stroke, resulting in a higher performance at high fuel consumption and low to low. The VTEC system uses two camshaft profiles and selects hydraulic profiles invented by the engineer clearly different from variable time-standard valves waiting times only forward and changing the camshaft or elevated valve profile in any way.
VTEC system gives engine valve times optimized for both low and high operation basic forming the only limitation axle lock according to a conventional engine has been replaced with two profiles optimized for low stability and fuel efficiency and the other designed to maximize high output. The switch between the two calm shades is controlled by taking into account engine oil pressure engine temperature vehicle speed and engine speed throttle control mode. The use of these items is set to change the downward height of the camshaft when conditions imply that the power of the engine is improved. At the switching point, a solenoid that allows the oil pressure from a flush valve maneuver a locking pin that connects the follower chamber high to low activates. From this point, the valves open and close according to the profile valve opening the lifting section longer and for an extended period of time. The switching point VTEC is variable between a minimum and a maximum and is determined by the engine load. The switch down from the high field to low is set at a speed lower engine switch representing a hysteresis loop to avoid a situation where the engine calls continuously at or around the point VTEC switch.