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The paper presents comparison of a selected combustion parameters of dual fuel, spark ignited engine run on gasolineand methyl alcohol. To the testing was used a four cylinder Fiat 1100 MPI engine with multipoint injection of gasolineand alcohol to area of inlet valve. Preliminary tests of the engine pointed at significant differences of its performancewhen the engine was run on alcohol only and on gasoline only [1]. In connection with it an indicator tests were performedin order to determine, on their base, a differences present in runs of combustions of the both fuels. The paper presentscomparison of maximal pressure, rate of pressure rise, average temperature of working medium, heat release rate, totalangle of combustion and indicated efficiency. These parameters were analyzed both in function of crankshaft rotationangle as well as engine load. Obtained results show at different course of methanol combustion comparing to gasoline.Run of methanol combustion is more rapid, what leads to growth of engine efficiency and increase of maximal cylinderpressures. Growth of working medium temperatures during combustion, what can lead to growth of thermal load of theengine, can be included to disadvantageous phenomena. Performed tests point at necessity of engine tuning modificationduring feeding with methanol, what would enable to take full benefits of advantageous properties of that fuel. Simultaneously,optimization tests have enabled to restrict disadvantageous effects of combustion of methanol.

Analysis of a chosen combustion parameters of dual fuel SI engine fuelled with alcohol and gasoline