Function And Operation Principle

Variable Intake Solenoid (VIS) Valve is installed on the intake manifold and changes the effective length of the intake passenger to improve intake efficiency under varying engine conditions.

1. Low/Middle Speed: VIS Valve Close → Resonating Effect → Improving Intake Efficiency
2. High Speed: VIS Valve Open → Improving Intake Inertia Effect → Improving Intake Efficiency

Fig 1: Identifying VIS Valve

Courtesy of HYUNDAI MOTOR CO.

Fig 2: Identifying VIS Valve Open And Closing Position

Courtesy of HYUNDAI MOTOR CO.