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In Poland and in other countries reformed diesel fuels have been produced since the early 80s [1, 2, 3, 6]. The distinctive feature of reformed diesel fuels is the fact that in the final stage of production they are subject to a deep hydrorefining process. This leads not only to the substantial decrease of sulfur contents in the fuel but also to the change of many physical chemical parameters concerning for example cetane number and fuel viscosity. The change of these parameters influences the course of working process in a diesel engine and particularly the course of a combustion process. That leads to some technical problems connected with the use of reformed fuels in engines of earlier design. The course of selected combustion process parameters in the engine fuelled with reformed fuels has been presented in the paper. The tests have been carried out both in steady - state and in transient conditions.

In the Department of IC Engines and Automobiles in Technical University of Radom SI engine fuelled with liquid butane injected to manifold has been investigated. The results have been compared with standard spark ignition engine fuelled with gasoline. The results of investigations show that overall efficiency of engine fuelled with butane is higher. The histories of pressure have been also registered during investigations. In results of analysis these histories the diagrams of maximum combustion pressure, rate of maximum pressure rise, position on maximum pressure and mechanical and thermal efficiency as a function of engine torque have been made.

In the Department of IC Engines and Automobiles in Technical University of Radom, CI engine has been modified to dual fuelling. As a main fuel liquid petroleum gas (LPG) is used. The diesel fuel is used to initiate combustion. Some investigation of standard diesel engine and modified one has been carried out. Tests of the engines consisted of preparation of load characteristics for some different ignition diesel fuel doses and for different injection timing of ignition dose. The emission of exhausts gases and histories of pressures as a function of crank angle has been measured during examination of the engines. It was noticed that the volume of ignition diesel oil dose and injection timing strongly influences overall efficiency, maximum engine torque and emissions and value of combustion process parameters.