Arrangement for and method of feeding air in piston engine

The invention relates to an arrangement for feeding air in a supercharged piston engine (1), which air feeding arrangement comprises at least a supercharging device (4) arranged for feeding air to more than one cylinder (3), an air chamber (2) in connection with the supercharging device (4), and a channel arrangement (5) leading from the air chamber to each cylinder (3) of the piston engine. In the arrangement, a resonator system (6) is arranged in connection with the air chamber for attenuating the pressure pulsation in the air chamber (2). In a method of operating the supercharged piston engine (1), combustion air is fed by means of the supercharging device (4) at a pressure higher than ambient pressure into the air chamber (2), air is led from the air chamber (2) to the cylinders (3) through the channel arrangements (5), and a pressure pulsation is formed in the air chamber, which pulsation is half-wavelength shifted from the pulsation in the air chamber, appearing at the third harmonics of the rotational speed of the engine or frequencies below that.