The paper presents an attempt to embody, in a calculation of the combustion and expansion phases of the working cycle of a spark-ignition engine, a representation of the observed fact that reaction is not completed in the flame front, but is continued in the enflamed gases. It is argued that the secondary reaction consists mainly in the transformation of excess carbon monoxide to dioxide, and crude representations of the formation of the excess and the rate of transformation are adopted. Results of computations made in this way conform with observation better than those made on the assumption of chemical equilibrium behind the flame front, and help to explain some experimental findings.
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