Abstract
Experiments are described which demonstrate that benzene becomes a knocking fuel when used in a spark ignition Otto cycle engine if operating conditions are such that the vapor–air mixture becomes impregnated with finely divided carbon. The carbon was obtained on the impingement of the flame of burning benzene on relatively cool surfaces in the combustion chamber and by the burning of liquid drops dispersed in a combustible vapor–air mixture. The droplets were obtained by wet carburation even when the over-all mixture was weak; the engine being run with low temperature coolant, low temperature air supply, and with the carburetor attached directly to the engine head.
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