Existing and currently being upgraded simplified models of the internal combustion engine workflow have very limited capabilities in terms of describing the fuel combustion process. Gorenje it is known that the most important means of studying the combustion in diesel fuel is the analysis of the indicator diagram for heat release. By analyzing the shape of the indicator chart, you can get information about the process of heat release during fuel combustion. The heat release characteristic is a function of the amount of heat released in the cylinder, from the angle of rotation of the crankshaft or time. The heat release characteristics are expressed in different ways: as a dependency of the absolute amount of heat from the current corner p.c.v., the integrated characteristic or the so-called dependence of heat release rate - differential characteristic. In most cases, the characteristics of relative heat release are used, rather than absolute. Vyatka agricultural Academy continues to study the impact of alcohol consumption in diesel engines when they are fed using a dual fuel supply system. The article presents the effect of methanol consumption on the characteristics of heat release.