VARIABLE RESONANCE INDUCTION SYSTEM (VRIS)
F2-100component photoVRIS applies to the K8-ZE V6 engine (V6 intake manifold shown).
DESCRIPTION
The inside of the dynamic chamber is divided into two, and two shutter valves are equipped on the connecting pipes for variable resonance induction system. This system opens and closes the shutter valves according to the engine speed to improve the charging efficiency by utilizing the pressure waves of the intake air. There are two vacuum chambers under the left bank of the intake manifold in order to supply constant vacuum to the VRIS shutter valve actuators during wide-open throttle operation and other low-vacuum, low-speed situations.
Operation
VRIS shutter valve operation by engine speed
VRIS shutter valve No.1
-1,900closed
1,900-2,600open
2,600-3,900closed
3,900-4,700open
4,700-6,300open
6,300-closed
VRIS shutter valve No.2
-1,900closed
1,900-2,600open
2,600-3,900closed
3,900-4,700closed
4,700-6,300open
6,300-closed