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Fan-radiator cooling systems for diesel engines have experienced only minor changes in basic design since their inception. However, the increase in power output over decades of development of the engine has forced the cooling system to become larger, more complex and more expensive. Problems of fan noise, low system efficiency, durability and safety persist. The thermodynamic basis for the design of a new cooling system for heavy-duty diesel engines is presented in this paper. The new system consists of an exhaust gas turbine driving a high-speed ducted fan to provide cooling air for engine and vehicle heat exchangers. Since the turbo-fan is not mechanically connected to the engine, the components can be located in more convenient places that favor vehicle aerodynamics, operator visibility and operational safety.

The turbocharger is a component common to both the intake and exhaust systems of internal combustion engines. The manner in which it is applied can have a major effect on the performance and durability of the engine, as well as influence the size and selection of other components in the system. A well-matched engine-turbocharger combination can be relatively insensitive to changes in environmental temperature and pressure, whereas a poorly matched combination may suffer extreme losses in performance and life. Some of the more important factors in matching a turbocharger to an engine are discussed with emphasis on how development of the turbocharger characteristics has contributed to the highly satisfactory performance being obtained from turbocharged engines today.

The 3TC Turboconveyor* discussed in this paper is a new product developed to provide a simple, low cost source of compressed air for the unloading of bulk commodities and is the first unit specifically designed to accommodate all conditions peculiar to pneumatic conveying operations utilizing the exhaust gases of the diesel engine as a source of power. The heart of the conveying system, a small, efficient, highspeed turbine driven centrifugal compressor, is described in detail.

In 1951, the Cummins Engine Company, Inc. conducted investigations concerning the application of turbochargers to our high speed diesel engines. Although several serious limitations of an operational nature were found to exist, the potential appeared to be very promising. This present paper outlines and discusses the subsequent developments to remove or extend the limitations and summarizes the current status of our turbocharged high speed diesel engines. The achievements have resulted in our production release of a line of high speed turbocharged diesel engines which are today establishing an enviable record of performance and economy in highway operation.