Variable Intake Solenoid (VIS) Valve: Description

Variable Intake Manifold (VIS) Valve is installed on the intake manifold. It combines or divides the two banks' intake air passages to improve intake efficiency in accordance with the ECM control signal calculated by engine operating condition.

Fig 1: Identifying Variable Intake Solenoid Valve

Courtesy of HYUNDAI MOTOR CO.

[The operation section of VIS valve]

Fig 2: Engine Speed Graph

Courtesy of HYUNDAI MOTOR CO.

AIR PASSAGE SPECIFICATIONS

VIS Valve	Air Passage	Effect
Open	Short Runner	Improvement in power
Close	Long Runner	Improvement in Low/Middle speed torque

Fig 3: Identifying Short And Long Runner

Courtesy of HYUNDAI MOTOR CO.