THIS paper, which was presented at meetings of the Buffalo and Pennsylvania Sections, begins with a statement of the advantages sought in adapting the Diesel cycle and developing oil engines to operate at high rotative speeds. Oil engines are classified according to their means for injecting and burning the fuel, and disadvantages attributed to the various systems are listed. Then follow descriptions of a number of engines of the different classes, selected according to the contribution their designs have made to the art. Particular attention is given to provisions for metering the fuel and for supercharging, which latter is said to have the same object as increasing the speed.
Discussion* at the Buffalo meeting was on general problems of lubrication and fuel, on other methods for securing power from fuel oil, and on economic comparison of gasoline and oil engines.
Discussers at the Pennsylvania meeting turned to more specific subjects, such as motorcoach and aircraft applications and the problems of securing accurate and uniform metering of the fuel. More rapid progress was thought probable by turning to specialists for the development of the injection apparatus, as gasoline-engine builders have done for carbureters and electrical equipment. The relation of engine speed to atomization and maximum pressure was considered, with the conclusion that nothing inherent to the cycle limits the speed of an oil engine.