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Comparison of operational parameters and stability of performance of an automotive SI engine powered by methyl and ethyl alcohols

Pietras Dariusz, Stelmasiak Zdzislaw, Pietras Piotr

Combustion Engines

2023

R. 62, nr 3

129--140

The article presents research results performed using automotive spark ignition engine run on methyl and ethyl alcohols as well as gasoline as a reference fuel. The research was performed on automotive engine of Fiat 1100 MPI type. The aim of the conducted analysis was to compare the operational parameters of the engine. These parameters included engine power output, overall efficiency, emissions of toxic components in exhaust gases, and a comparison of the combustion process course. This comparison was conducted based on recorded and averaged indicator diagrams, as well as individual combustion cycles. The averaged diagrams were used in analysis of the pressure course during combustion, in analysis of pressure growth rate and heat release rate. Diagrams of individual combustion served for assessment of operational smoothness of the engine when fuelled with alcohols. As the reference, parameters measured in case of gasoline fuelling were used.