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This paper describes some factors influencing small turbocharger design and describes some techniques used in their development. In the first section, specific techniques used in developing turbocharger journal bearings and rotors are discussed. The influence of engine application upon turbocharger aerodynamic design requirements is discussed with examples in the second section.

This paper presents a background of the cam and tappet wear problem encountered by the automotive industry during the evolution of the modern overhead valve V-8 engine. Investigation of the numerous factors affecting this problem revealed that engine oil composition was of major importance. The development of a test technique to determine the adequacy of engine lubricant antiscuff properties is described and evidence of correlation with field experience is presented. This test technique was accepted by Section G-IV of Technical Committee B of ASTM Committee D-2 in October, 1959 as Test Sequence IV. This test was one of a series of test sequences to be used for evaluating oils for API Service MS. Shortly after the end of World War II, the modern V-8 engine was introduced to the American motorist.

The U. S. Naval Engineering Experiment Station's experience with cavitation-erosion failures of several engine crankcase designs are described. A unique test procedure involving the use of soft test plugs was developed for rapid evaluation of possible corrective measures required for a naval 600-horsepower aluminum crankcase design. A wide-band cylinder water seal, designed and developed to prevent crankcase cavitation-erosion failures, is described. In both laboratory and Fleet tests, the new seal prevented cavitation-erosion in the critical water seal areas of the aluminum crankcases of these engines.