Abstract
Small high-speed Diesel engines used in automobiles require a combustion cycle more near to the Otto than the Diesel, and this means a very short injection period. The authors discuss the problem of noise and make suggestions for its elimination. Extensive tests have led them to believe that a separate combustion chamber is the most suitable for this type of engine. The excellent economy at part load and the advantages over the gasoline engine are attributed to the high expansion ratio and the inverse relationship of load and thermal efficiency.
Consideration is given to fuel requirements and results of tests are given. The distributor type fuel pump is considered to be better than the in-line jerk pump. Methods of eliminating vapour lock when using the more volatile fuels are suggested.
Preliminary information suggests that the small Diesel will run considerably longer than the same size gasoline engine before it requires reboring or relinering.
The authors conclude with recommendations for the ideal fuel.
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