Abstract: A single air inlet for a pair of turbochargers has a duct portion with a circular inlet, a converging bifurcated portion having a pair of circular outlets, which are in fluid communication with inlet portions of compressor portions of the turbochargers and evenly distribute the incoming air to the compressor inlet portions, a baffle disposed in the bifurcated portion separating the outlet portions to prevent pulses generated in one compressor portion from affecting the other compressor portion and an elbow portion that registers with the circular inlet.

Abstract: A sparkplug cooling passageway is disposed in a second body portion of the cooled pre-combustion chamber assembly. The sparkplug cooling passageway has a first side surface spaced about a threaded bore portion disposed in the second body portion. The first side surface and a second side surface define the sides of the sparkplug cooling passageway. An opening disposed in the second body portion opens into the passageway at the second side surface and passes cooling fluid between a cylinder head and the passageway.

Abstract: A pre-combustion chamber assembly and method for an internal combustion engine consists of first, second and third body portions of different metallic materials. A second end of the first body portion is joined to the first end of the second body portion by brazing and the first end of the third body portion is joined to the second end of the second body portion by controlled depth penetration welding. The first, second and third body portions are pre-machined. The first and second body portions are connected to form a first subassembly and the third body portion is subsequently connected to the first subassembly.