: This paper presents the development of a thermodynamic model for prediction of the auto-ignition phenomenon, applied to spark-ignition engines, and the characterization of said model, in order to accurately predict the temperature in the combustion chamber, and therefore evaluate the auto-ignition probability at a certain operating condition. From the results, can be concluded that the auto-ignition probability increases at higher intake pressures and compression ratios, and the intake temperature greatly raises the phenomenon, generating the auto-detonation at lower compression ratios. The model results are in accordance to the experimental data, and this gives the possibility to verify if a machine operating under certain conditions can be used in another place and another type of fuel without the risk of autoignition.