Variable Induction System: Description and Operation

INDUCTION CONTROL SYSTEM
There is a butterfly valve on the partition between the intake manifold's right bank and left bank chambers. This valve is operated by the induction valve actuator installed on the intake manifold. During operation of the engine, pressure waves are generated in the intake manifold. The pressure waves have an effect of improving air intake efficiency. To make the most of this effect, the direction of the pressure wave is changed by opening and closing the induction valve in accordance with the engine speed so that increased engine output torque is obtained in all speed ranges.