The objective of this study was to evaluate the effect of blends of
different oxygenated additives on gasoline in SI engine Otto cycle. The
formulations analyzed were: pure gasoline (type A), common gasoline (type C),
gasoline type A + 15% (v/v) oxygenated additives (ethanol, ethyl octanoate,
ethyl oleate). The experiments were performed using engine Branco 4-stroke and
2-cylinder, electric dynamometer, exhaust system, control unit composed of
Multi-K unit, variable selector and load cell, stroboscope tachometer, fuel
supply system and stopwatch. The rotation was conserved at 4400 rpm and wheel
power varied from 3 kW to 12 kW, with intervals of 3 kW to obtain hourly
consumption curves and brake specific fuel consumption. Even esters and ethanol
having lower heat of combustion, hourly consumption was similar to pure
gasoline (type A). In relation to the brake specific fuel consumption,
increasing the wheel power had a better conversion of the mass of fuel burned
into energy. Thus, this study showed that the mixture of gasoline and esters
(ethyl octanoate and ethyl oleate) presented good efficiency in terms of
consumption. This research contributes to the needs and to the current studies in which industries started to add renewable
products to petroleum-derived fuels; in order to obtain more sustainable
fuels at lower costs.
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