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Cleaner and more efficient combustion engines have been expected to suppress the consumption of petroleum resources and to save the environment of the earth. From such a standpoint, lean mixture has been thought to be suitable. Recently, the cars equipping engines that can burn at equivalence ratio of approximately 0.6 have been developed. The mixture whose strength is lower than 0.6 is thought not to be appropriate for internal combustion engines because such engine cannot afford stable driving. So, the mixture whose strength is lower than 0.6 must be augmented by any new devices. Several jet ignition methods such as plasma jet igniter have been proposed. Most of them are thought that the principal factor of augmentation is radicals. Strong jet is also a factor of augmentation. Authors had the latter standpoint and proposed hydrogen jet igniter. It uses small amount of hydrogen. The combustion processes are similar to that ignited by plasma jet.

The mechanism of combustion in a chamber with an auxiliary one is very complex and the mechanism has a great influence on the performances of an engine. Combustion processes in the chamber have been investigated by taking pressure, temperature, ion current and schlieren photographs of the flame. It is found that the duration of combustion, histories of pressure and temperature distribution are greatly influenced by the configuration of the two chambers. But the effect of stoichiometry of the mixture is not so great because the mechanism of combustion is strongly affected by the speed and intensity of the jet.