Abstract: The invention relates to a Helmholtz resonator (6) for damping airborne sound in a space, particularly in a conduit (4, 5) transporting airborne sound, comprising a housing (8) surrounding a resonance volume (9), comprising at least one neck (10) for connecting the resonance volume (9) to the space or to the conduit (4, 5) transporting the airborne sound. The Helmholtz resonator (6) obtains at least two resonance frequencies if the housing (8) has at least one wall section delimiting the resonance volume (9), said wall section being formed by a vibratory membrane (11), and if the membrane (11) is tuned such that the resonance frequency thereof corresponds to the first order of the resonance frequency of an identically constructed Helmholtz resonator that does not have such a membrane (11).

Abstract: An example induction system for an engine includes a plenum in fluid communication with multiple primary runners. A plenum valve is arranged between first and second chambers of the plenum, which are respectively in fluid communication with first and second sets of the primary runners. The plenum valve is configured to move between open and closed positions and regulate flow between the first and second chambers. A second runner is arranged upstream from and in fluid communication with the plenum. A runner valve is arranged in the secondary runner and configured to vary the amount of flow through the secondary runner. A common actuator is interconnected to both the plenum and runner valves and is configured to move both of the plenum and runner valves between desired positions to achieve desired valve configurations that tune the engine.

Abstract: An induction system is designed for an engine that includes a manifold having a plenum in fluid communication with primary runners. A plenum valve is arranged between first and second chambers of the plenum that are respectively in fluid communication with first and second sets of the primary runners. The plenum valve is configured to move between open and closed positions to regulate flow between the first and second chambers. A secondary runner is arranged upstream from and in fluid communication with the plenum. The secondary runner includes first and second runner portions with the second runner portion being shorter than the first runner portion. A runner valve is arranged in the secondary runner between the first and second runner portions and is configured to selectively direct flow through the first and second runner portions to the plenum to obtain a desired effective tuning length.

Abstract: An air cleaner and resonator assembly is formed from a lower shell portion and an upper shell portion that are joined together to define an interior cavity having an inlet through which air is drawn. An exit tube, formed within the lower shell portion, directs air from the inlet to the engine. A middle shell portion is positioned within the inter cavity and is joined to both the upper and lower shell portions. A lower portion of a resonator is molded into the lower shell portion and an upper portion of the resonator assembly is molded into the middle shell portion. The upper portion is aligned with the lower portion and the middle and lower shell portions are welded together to form a sealed resonator chamber that attenuates engine noise. The upper and lower shell portions are then welded together to form the air cleaner and resonator assembly. Air filters are installed within the interior cavity and are selectively accessible through movable covers installed in the upper shell portion.

Abstract: An air cleaner and resonator assembly is formed from a lower shell portion and an upper shell portion that are joined together to define an interior cavity having an inlet through which air is drawn. An exit tube, formed within the lower shell portion, directs air from the inlet to the engine. A middle shell portion is positioned within the inter cavity and is joined to both the upper and lower shell portions. A lower portion of a resonator is molded into the lower shell portion and an upper portion of the resonator assembly is molded into the middle shell portion. The upper portion is aligned with the lower portion and the middle and lower shell portions are welded together to form a sealed resonator chamber that attenuates engine noise. The upper and lower shell portions are then welded together to form the air cleaner and resonator assembly. Air filters are installed within the interior cavity and are selectively accessible through movable covers installed in the upper shell portion.

Abstract: An improved radiator core assembly for typical automotive and similar uses comprises fins angled with respect to the plane of the radiator core. Air entering the radiator is redirected by the fins to match the angle of the blades of a fan forcing air through the radiator.