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INTAKE-AIR SYSTEM 01–13–5 01–13 INTAKE MANIFOLD/DYNAMIC CHAMBER CONSTRUCTION [LF] E5U011313100N01 • The intake manifold composed of the variable intake air shutter valve actuator. End Of Sie VARIABLE INTAKE AIR SYSTEM FUNCTION [LF] E5U011300020N01 • The variable intake air system maintains high torque from the low to high engine speed ranges. • If any of the following conditions are met, the effective intake manifold length is changed to enhance the inertia charging effect. As a result, higher torque is obtained in all ranges. — Engine speed is approx. 4,750 rpm or more. — Engine speed is approx. 3,150 rpm or less and the throttle opening angle is the specified value or more. (heavy load condition) • For the variable intake air control, refer to CONTROL SYSTEM, Variable Intake Air Control (See 01–40–15 VARIABLE INTAKE AIR CONTROL OUTLINE [LF].) Inertia charging effect — Airflow in the intake air pipe pulsates according to the opening and closing of the intake valve. When the intake valve closes, intake air is compressed near the intake valve due to inertia force. The resulting Effective intake manifold length — The effective intake manifold length is the length from the intake valve to the dynamic chamber. — The effective intake manifold length changes according to the positioning of the reflected pressure wave transmitted through the intake air pipe by the opening and closing of the variable intake air shutter valve in End Of Sie VARIABLE INTAKE AIR INTAKE MANIFOLD DYNAMIC CHAMBER E5U113ZS5015 CLOSING AREA OPENING HIGH HIGH LOW LOW ENGINE TORQUE ENGINE SPEED APPROX. 4,750 RPM OPENING AREA : VARIABLE INTAKE AIR : VARIABLE INTAKE AIR *1: THROTTLE OPENING ANGLE IS THE SPECIFIED VALUE OR MORE E5U113ZS5002 |