The method involves supplying fresh air from a fresh air plant (4) to cylinders (3) of a piston engine (1) to drive off exhaust gas of the cylinder by an exhaust system (5). A loading of the respective cylinder with fresh air is supported during a gas exch...

A first pipe (10) feeds an internal combustion engine with air. A second pipe (14) runs at both its ends into the first pipe in different areas (16,18). A loudspeaker has a signal transmitter (26) and an oscillatory membrane (22) with devices (24) to excit...