In this research, a new methodology to evaluate the operation of spark ignition systems in high density conditions is presented. New requirements in engines and new combustion modes demand more from these systems. One of the most important new requirements is the increase in density. Thus, a better understanding of the eﬀects of high density and the behavior of the ignition system in these conditions seems necessary. To carry out this work two experimental facilities have been used: a transparent constant volume vessel, and an optical engine to simulate real engine conditions. Thus, the study combines the electrical signals derivate parameters and images obtained with a high speed camera. The methodology has been applied for diﬀerent cases of pressure, intake temperature, and other parameters that aﬀect the density. Results show that an increase in density causes a decrease in integrated power. Additionally, the dispersion in this integrated power increases too. Finally, the methodology results oﬀer a useful data base for the engineers willing to improve the design of the ignition system. Moreover, it is validated that the results of the ambient transparent constant volume vessel follow the same trends and values as the realistic ones.