The top wall of the reaction chamber has an exhaust nozzle formed therein facing the branching portion of the auxiliary intake manifold. An exhaust pipe extends through a remote end wall at the opposite end of the reaction chamber. Exhaust passages supply hot exhaust gases from the cylinders to exhaust gas conduits, each of which receives hot exhaust gases from two adjacent cylinders and projects through an insulated wall of the reaction chamber to discharge into it toward an end wall thereof. An auxiliary intake manifold with branching portion directly below the central portion of the branching portion of the main intake manifold communicates with auxiliary intake passages to supply a rich air-fuel mixture to the more » auxiliary combustion chambers. A main intake manifold with branching portion over the reaction chamber communicates with main intake passages to supply a lean air-fuel mixture to the main combustion chambers. Each cylinder has a main combustion chamber communicating with an auxiliary combustion chamber by means of a torch opening. « lessĪn internal-combustion spark-ignition V-8 piston engine has an exhaust gas reaction chamber body positioned between its two banks of cylinders. The fuel delivery means being operable to increase the volume of the trailing air stream portion mixed with fuel by advancing the starting time of the fuel injection period to increase the length of such period measured in units of space expansion. This patent describes an internal combustion engine having a main air inlet passage communicating at an end thereof through the face of an cylinder head with an alternately expandable and contractable variable volume space in an end of a cylinder closed by such head, there being within the cylinder head a precombustion chamber forming a section of such passage and interposed between the space and an upstream portion of the passage, the chamber having a principal axis extending between opposite ends thereof and of which ends one is an air inlet and having a valve seat through which the chamber more » is communicative with the upstream passage portion and of which ends the other is an open end through which the passage has two-way communication with the space and is disposed to discharge air from the chamber into the space axially of the cylinder, the combination of air deflecting means in the chamber and operable during expansion of the space to modulate the flow of intake air passing through the chamber into the space into the form of a stream composed of a core portion flowing axially of the cylinder into the space and of a tubular portion encircling the core portion and flowing helically thereabout, fuel delivery means operable during a fuel injection period commencing during expansion of the space and subsequent to entry of a leading portion of the air stream into the space to inject evaporative fuel into the passage and into a trailing portion of the air stream therein at a rate to mix and form therewith an air-fuel mixture lean in fuel richness than flows within and at least partially through the chamber en route to the space during the expansion thereof. A stationary mixer within the tubular member ensures that the combustion is substantially complete, and also promotes heat exchange between the hot gases passing to the exhaust pipe and the exhaust gas in the reactor around the tubular = , Burning rich exhaust gas passes through the flame trap orifices into the tubular member and entrains therewith lean exhaust gas causing combustion of combustible components therein. A tubular member disposed concentrically within the reactor has one or more flame-trap orifices at or towards the said one end and is connected to an exhaust pipe at the other end. The rich exhaust gas is passed into one end of a cylindrical reactor and the lean exhaust gas into the remaining part of the reactor. Air is mixed with the exhaust gas from each cylinder and the rich exhaust gas ignites. A multicylinder internal combustion engine is operated with one cylinder supplied with a fuel-rich charge and the other cylinder(s) with a lean or leaner charge so that the one cylinder produces ''rich'' exhaust gas which is rich in combustible components and the other cylinder(s) produce ''lean'' exhaust gas which is lean in combustion components.
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