Intake control system for engine

摘要

The invention provides an intake control system for an engine capable of improving a high speed output performance by certainly reducing an intake resistance in a high speed rotational range of the engine while ensuring a low speed output performance of the engine. To achieve this a small cross-section passage 33a and a large cross-section passage 33b, which are disposed in parallel, are formed in an air cleaner 17 interposed in an intake system In of an engine E. An intake control valve 35 for opening/closing the large cross-section passage 33b is provided in the air cleaner 17. An actuator 71 for closing the intake control valve 35 in a low speed rotational range of the engine E and opening the intake control valve 35 in a high speed rotational range of the engine E is connected to the intake control valve 35.