VTEC System

• The VTEC system changes the cam profile to correspond to the engine speed. It maximizes torque at low engine speed and output at high engine speed.
• The low lift cam is used at low engine speeds, and the high lift cam is used at high engine speeds.

K20Z2 engine 

Fig 1: VTEC System Low And High Speed Valve Timing Chart (K20Z2 Engine)

K20Z3 engine 

Fig 2: VTEC System Low And High Speed Valve Timing Chart (K20Z3 Engine)