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The nitrogen oxide (NOx) emitted by the internal engines is an undesirable pollutant and responsible for the photochemical smog when reacts with ultraviolet light from the sun. This smog can cause eyes and respiratory system irritation as also damage plants. The torch ignition system has been proving to be a viable alternative for reducing NOx emissions, and it is one of the main attractions of the system. NOx formation is closely related to the system’s work temperature. Thus, determining the temperature in the pre-chamber is of fundamental importance, whereas the torch ignition system operating at a temperature above the specified, could lead to an increase in NOx emissions, in the probability of detonation and in the probability of pre-ignition, the possibility of limiting performance, an increase in mechanical efforts and deformation/ breakage.