The Significance of the Time Concept in Engine Detonation

An experimental method has been developed by means of which the variables affecting the time element in the detonation process in a spark-ignition engine can be controlled and approximately measured. In the investigation of the time element it was found that higher maximum permissible pressures can be used if the rate of compression of the end gas is increased. In order to draw fundamental conclusions, experimental data of engine detonation should be accomplished by the pressure-temperature-time history of the unburned charge. A discussion on the precision of various methods of determining the pressure and temperature of the unburned charge is included. Certain aspects of ignition delay and the mechanism of normal and detonating combustion are considered on the basis of chain-reaction theory.