VARIABLE INTAKE AIR SYSTEM OPERATION [ZJ, ZY]

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With Variable Intake Air System Only

Operation condition

•  For the operation condition, refer to CONTROL SYSTEM, VARIABLE INTAKE AIR CONTROL. (See VARIABLE INTAKE AIR CONTROL OPERATION [ZJ, ZY].)

Except operation condition

•  The variable intake air shutter valve is closed by variable intake air shutter valve actuator operation.

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•  Under this condition, the effective intake manifold length is from the intake valve to the dynamic chamber (A—C). An inertia charging effect is obtained due to this elongated intake manifold length, air intake volume in the cylinder increases, and higher torque is obtained at low and middle to medium engine speeds.

Operation condition

•  The variable intake air shutter valve is opened by variable intake air shutter valve actuator operation.

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•  Under this condition, the effective intake manifold length is from the intake valve to the chamber (B—C). The intake air inertia effect is obtained at middle and high engine speeds due to this shortened intake passage, increasing intake airflow amount in the cylinder, and higher torque at middle and high engine speeds is obtained.