Variable Induction System: Description and Operation

Variable Resonance Induction System:

PURPOSE
Variable Resonance Induction (VRIS) System opens and closes shutter valves in the dynamic chamber according to engine speed. This improves charging efficiency by using intake air pressure waves.

LOCATION
Shutter valves and actuators are on dynamic chamber.

OPERATION

VRIS System Operation:

Inside of dynamic chamber is divided into two sections, interconnected by two shutter valves and connecting pipes. Two vacuum chambers under the intake manifold left bank supply constant vacuum to VRIS shutter valve actuators during wide-open throttle operation and other low vacuum, low speed situations. System operates in rpm range shown on image chart.