It is known, that about 90 % of mechanical energy which uses mankind in the activity, it is developed by internal combustion engines (ICE). They are the basic consumers fuels an oil origin which geological resources are rather limited. Very sharply questions of maintenance ICE fuel face to the countries of importers of oil, among which and Ukraine. Therefore scientific researches and the practical actions directed on searches effective alternative ICE fuel have the big urgency.

       Faculty " Internal combustion engines " of the Kharkov state polytechnical university during last ten years carries out researches in this important direction. For this time the analysis of opportunities of use in ICE different kinds alternative fuels is executed, thus the significant attention is given fuels from renewed sources of raw material. These of fuel have a liquid or gaseous status, are made from green weight or seeds of plants. In the majority these of fuel considerably differ from traditional liquid hydrocarbonic fuels the physical and chemical properties which influence both the organization of working process ICE, and on final technical and economic and ecological parameters of the thermal engine. All this also causes necessity of scientific researches which results are the basic maintenance{contents} of given clause{article}.

       On the basis of the analysis it has been determined, that perspective alternative fuel ICE for conditions of Ukraine is fuel which receive by mixing liquid hydrocarbonic fuel and derivatives рапсового oils (RO) - methyl ethers РМ (MERO). To parameters which influence processes of evaporation, смесеобразования and combustions, first of all, concern: density of fuel, kinematic and dynamic viscosity, a superficial tension.