Internal combustion engines (ICE) are the basic consumers fuels from oil which stocks in separate regions of the world are rather limited. If to this to add the ecological harm rendered to an environment by fulfilled gases ICE more and more attractive, it is especial for Ukraine, to become idea of application as energy carriers for diesel engines alternative fuels vegetable (rapseed, sunflower, soya oils and their derivatives). In the majority they the physical and chemical properties essentially differ from traditional oil fuels, that influences as the organization of working process in the cylinder of the engine, and on its technical and economic parameters and ecological characteristics.

       In given article the questions connected to improvement of parameters of a diesel engine at the expense of change of a chemical compound and physical properties of a fuel composition, consisting of methyl (МERO) or этиловых (EERO) ethers of fat acids rapseed oils - biodiesel are examined. At an establishment of parities of parameters of job of a diesel engine (the hour charge of fuel HC, factor of surplus of air and amount of emissions carbon dioxode of М _со2) on various kinds fuels we shall accept, that effective power N е a diesel engine in all cases on each of modes is identical.
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