Abstract: In a turbocharged internal combustion engine having at least two exhaust gas turbochargers arranged in parallel, each including a turbine connected by an exhaust conduit to the engine exhaust to be driven thereby and a compressor connected by an air supply conduit to the intake of the engine for supplying compressed air thereto, an exhaust gas recirculation conduit connected to the exhaust conduit upstream of the turbine leads to the air supply conduit of only one of exhaust gas turbochargers and a check valve is arranged in the air supply duct upstream of the jointure thereof with the exhaust gas recirculation conduit so as to involve only one of the exhaust gas turbochargers in the exhaust gas recirculation.

Abstract: The invention relates to a process for casting novel motor vehicle wheels from metal, such as from an aluminum alloy, which wheels have a rim ring and a hub part connected by supporting radial elements. According to the present process the casting mold is formed by a plurality of molded core parts that are mainly ring- and/or disk-shaped and which are axially assembled while still attached to their mold sections and are centered relative to each other by the relative adjustment of the mold sections. The parting plane of the core parts runs perpendicularly to the wheel axis. This permits one-piece wheels to be cast with great accuracy, which wheels have few, if any, visible mold seams.

Abstract: A core box for producing casting cores having a core defining member made of a first material and defining a core molding cavity. A stream of molding substance is introduced into the core molding cavity when a core is molded. A core marker is made of a second material and is located in the core member in fluid communication with the cavity. The second material is more wear-resistant than the first material, being a non-deformable hard metal. The core marker is a shaped insert for defining a predetermined configuration of a casting core when a molding substance is introduced into the core molding cavity. The shaped insert is located at a position within the core molding cavity at which position high velocity flow or changing velocity flow of a stream of molding substance is intercepted.

Abstract: Molten metal is poured from a melt container to a mold cavity defined by a molding material wherein the molding material in the region of the runner gate is of a higher density with respect to the rest of the molding material. A pouring lip protruding from the melt container seals in the region of the runner gate for delivering molten metal from the melt container to the mold cavity.

Abstract: In a method of producing cores for foundry purposes, with the cores being composed of at least two core sections and being firmly joined with one another, the individual core sections are molded separately in a core mold composed of at least two mold sections. At the end of a molding process for the individual mold sections, their core mold is opened in such a manner that the core section remains connected with a mold section. Then the individual core sections to be joined, together with their mold sections, are moved into an assembly position and are joined together by defined relative movements of the mold sections with respect to one another. After the joining process, the one mold section is released first and then the assembled core is ejected from the other mold section.