Abstract
On the basis of the results of studies by the authors of the peroxidic products of the gas-phase oxidation of a number of hydrocarbons it is suggested that an increasing tendency to knock is related to an increased tendency for the fuel to form hydroperoxides and in particular dihydroperoxides on oxidation. Some of the problems of the relative knock resistances of hydrocarbons can be explained on this basis. The high anti-knock effect of lead tetraethyl can then also be explained if in the cylinder a fog of lead oxide is produced, causing rapid heterogeneous decomposition of peroxide intermediates, and thus preventing branching due to these compounds.
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