Air Induction System: Operation

Air induction is controlled by reed valve(s) mounted on the cylinder head. The reed valve(s) functions as a high speed check valve, operated by each exhaust pulse which passes the induction port. When the reed valve opens, fresh air is drawn from the air cleaner housing. A separate filter element in the air cleaner both filters and silences the air intake system.

On Strada and X1/9, the inducted air is supplied to a delivery passage in the cylinder head and feeds to all cylinders. On Brava and Spider, inducted air is supplied to two delivery passages in the cylinder head. One passage feeds cylinders No. 2 and 3, while the other passage feeds cylinder No. 4. To prevent interference with the EGR pick-up, inducted air is not supplied to cylinder No. 1.