The aim of this experimental investigation is to analyse the performance and emission characteristics of spark ignition engine running on petrol doped with various additives. Additives used in this research work are toluene, benzene and ethanol at 20% concentrations on volume basis. The engine test set-up consists of a single-cylinder, four-stroke and stationary petrol engine. The engine performance with petrol doped with ethanol was found to be better than pure petrol, while the performance with toluene as additive was found to be slightly poorer than that of petrol at low loads. However, at higher loads, engine performance with toluene-doped petrol was better than that with pure petrol. For all values of loads, the engine performance with benzene was found to be poor. The short-term experimental results showed that petrol, containing 20% toluene and 20% benzene as additives, can be successfully substituted without any alteration in engine design.
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