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Present research efforts are pursuing the development of complex fuel delivery systems in an effort to successfully incorporate existing combustion chambers and coolant systems designed for hydrocarbon fuels into a hydrogen-fueled engine design. This paper presents the hypothesis that fundamental redesign of the combustion chamber shape and coolant passages can solve the hydrogen engine design problems more economically than redesign of the fuel delivery system. The differences in knock with hydrogen fuel and with hydrocarbon fuel are discussed. It is concluded that the combustion chamber shapes designed to reduce knock with hydrocarbon fuel actually promote knock with hydrogen fuel.

Five fuels have been tested for 200 hours each in five separate but physically identical engines. The five fuels are, two shale oil-derived gasolines, two coal-derived gasolines, and one baseline unleaded gasoline. The results reported in this paper describe the tendency of the fuels to undergo postignition-induced-knock, and the indicators used for predicting the severity of this knock. The tendency of the fuels to produce intake valve sticking is also described. Additionally the chemical and physical properties of the alternative gasolines are reported herein. These results give further insight into the potential advantages and disadvantages of alternative gasolines.