Air intake manifold with retractable element with acoustic duct for internal combustion engines.

Each air duct (3) COLLECTOR HAS A PIPE DOWN (4) AND TWO TUBES UP: ONE SHORT (8) and a long (9), and, between them and PIPE DOWN (4) TILTING ELEMENT (18) traversed by a conduit ACOUSTIC (19). In one of two extreme positions ELEMENT (18), acoustic conduit communicates ONE OF THE PIPES UP (8, 9) WITH PIPE DOWN (4), while the other tube up REMAINS sealed, Y, in the other extreme position, it allows communication between the other pipe UP (8, 9) WITH PIPE DOWN (4) sealing the first pipe UP. ELEMENT (18) can be swiveled, VA housed in a casing (15) and has, perpendicular to its axis (A) TILT, TWO SIDES SIDES SLIDING CONTACTLESS EACH OF WHICH fricciona ONE OF THE TWO SIDES SIDES OF THE CABINET (15) when BASCULA member (18), sO THAT THE INFLUENCE OF ROLLING WARRANTED good lateral seal between the element (18) and housing (15). APPLICATION TO EQUIPMENT ENGINES FUELED INTERNAL COMBUSTION injection PARTICULAR FOR MOTOR VEHICLES.