The VTC system makes continuous intake valve timing changes corresponding to the operation conditions.
It optimises intake valve timing to allow the engine to produce maximum power.
Cam angle is advanced to obtain the EGR effect and reduce the pumping loss. The intake valve is closed quickly to reduce the entry of the air/fuel mixture into the intake port and improve the charging effect.
Reduces the cam advance at idle, stabilises combustion, and reduces engine speed. If a malfunction occurs, VTC system control is disabled and the valve timing is fixed at the fully retarded position.
VTEC system
The VTEC system changes the cam profile to correspond to the engine speed. It maximises torque at low engine speeds 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.
The K20A2 engine changes both the intake and exhaust camshaft. Only the intake camshaft side has a VTEC mechanism on the K20A3 engine.
