In the following report, it will be shown the development and the operation of a mixing system of vaporized ethanol and dry air capable of dosing a homogeneous and stoichiometric concentration inside the combustion chamber of a rapid compression machine. It will be explained the basic concept of the compression machine operation, the assembly and the instrumentation of the experimental apparatus built in the research laboratory, the theory and the calculus of the equipment sizing used, as well as some experimental results. The performed tests, that proved the efficiency of the produced equipment for the simulations of combustions in engines with spark ignition indirect injection, allows the study of the air-ethanol pre-mixture combustion.