|
|
Page 7
Lotus Service Notes
Section EH Airbox Flap Valve In order to reduce airflow restriction into the airbox at periods of high demand, and also to provide an acoustic enhancement, the ECU, when switching to high valve lift mode, also opens a flap valve in the under- side of the airbox body. This butterfly valve is sprung open, and is closed by a vacuum actuator supplied from the inlet manifold. The vacuum supply uses an in-line non-return valve and a reservoir incorporated into the front face of the airbox body to maintain flap closure during periods of low inlet depression. A solenoid valve mounted on top of the airbox, and connected into the vacuum capsule line, is energised by the ECU when ap- propriate to ventilate the capsule and open the valve. Airbox flap valve plumbing Non-return valve To inlet manifold Redundant port capped Intake flap solenoid valve Air cleaner Vacuum reservoir
em238
Intake flap valve actuator |