Patent ID: 7069920

Claim:
Air supply unit ( 1 ) for an internal combustion engine comprising an intake box ( 2 ) in communication with an external environment; a number of butterfly valves ( 3 ), each of which has its own internal duct ( 4 ) interposed between the intake box ( 2 ) and the intake ducts of the engine cylinders; and a distributor device ( 6 ), which includes a chamber ( 7 ) connected to the intake box ( 2 ) by means of a first air duct ( 8 ) regulated by a solenoid valve ( 9 ) and includes for each butterfly valve ( 3 ), a respective distribution duct ( 10 ) capable of placing the chamber ( 7 ) in communication with the internal duct ( 4 ) of said butterfly valve ( 3 ); wherein inside the distributor device ( 6 ), each distribution duct ( 10 ) is connected to a corresponding regulation duct ( 13 ) that opens into an air intake ( 14 ), which is accessible from the outside of the distributor device ( 6 ) and is closed by an associated removable plug ( 15 ).