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Compacted Graphite Iron (CGI) has been recognized for years as a unique material possessing a fortunate combination of properties intermediate between gray iron and ductile iron. This material, for reasons outlined in this paper, is ideal for cylinder blocks, heads and other cast iron components for diesel engines. It makes possible casting weight savings of up to 1/3 and/or increased power output. This paper will outline reasons why this is now possible, whereas it has seldom been applied in volume production heretofore. Physical and mechanical properties of CGI, which provide the opportunity for weight reduction and increased power, are discussed. Currently, most diesel engine cylinder blocks, heads, liners and many other castings are produced from gray iron, which requires relatively heavy sections to provide the strength, stiffness and durability necessary for commercial application.

Early in the 1970's, Oldsmobile recognized the need to construct a new accurate, reliable, and versatile emission test facility to accommodate the more stringent Federal and State emission standards. This paper reviews in detail: layout of the test facility, its measurement capabilities, computer data handling, storage and retrieval processes, and a special data reduction program capable of producing two or three dimensional plots of dynamic engine emission parameters. The final section reviews the facility's physical design, data acquisition capability, and computer versatility which will permit updating in the future to accommodate changes in this very fast moving field of emission measurement technology.

Presented in this paper is a discussion of the General Motors air cushion restraint system for the driver position. A discussion of the overall system operation and performance is followed by a detailed description of the components including the crash sensors, steering column, and air cushion module.