Abstract: A compressor including a housing defining an interior plenum; a refrigerant received within the interior plenum and having a resonant wavelength; a motor disposed within the housing; a compression mechanism disposed within the housing and operably connected to the motor; and a tuner. The tuner has an open end and a closed end, and defines a resonating cavity, which is in direct communication with the interior plenum via the open end. The resonating cavity defines a length extending from open end to closed end that measures one-fourth of the resonant wavelength of the compressor assembly or of a noise frequency for which attenuation is desired. The tuner may be curved or straight and may extend vertically or horizontally. A suction inlet tube extends through the housing and communicates refrigerant to the interior plenum. The open end of the tuner indirectly communicates with the suction inlet tube through the interior plenum.

Abstract: The present invention provides a tuned muffler for small, single cylinder internal combustion engines, particularly 4-cycle engines. The muffler includes a first shell having an exhaust inlet, a central plate, and a second shell having an exhaust outlet. The central plate is disposed between the first and second shells, and the foregoing components define an exhaust path therethrough which includes a first expansion volume, a first passage, a second expansion volume, and a second passage. The first and second expansion volumes and the first and second passages are dimensioned to provide an exhaust tuning effect to enhance engine performance, and also to provide an exhaust flow path which conducts the exhaust gas smoothly through the muffler to substantially reduce back pressure within the muffler.