Additional air supply means for an internal combustion engine

A means for supplying additional air into the suction manifold of an internal combustion engine downstream of the throttle valve, said means comprising an additional air discharge device protruding into the suction manifold, a flow rate controller for the additional air, an additional air supply line between the additional air discharge device and the flow rate controller and a vacuum line leading from the suction manifold to the flow rate controller for the detection of vacuum and for the application of vacuum to the controller for the operation of the same, characterized in that the additional air discharge device is formed as a nozzle tube (5) which is associated with one combustion chamber of the internal combustion engine, respectively, which extends through a wall bore of the respective intake port (4) and which includes a throttle (12) and an air discharge opening (15) at the forward end thereof, said nozzle tube being disposed at the combustion chamber end of the intake port (4) directly adjacent to the inlet valve.