CHARACTERIZATION OF PETROL, ETHANOL AND SPENT ENGINE OIL BLENDS FOR TWOSTROKE SINGLE-CYLINDER SPARK-IGNITION ENGINE.

This research has provided additional information to conduct performance evaluation of petrol, ethanol and spent engine oil using various mix ratio of sample 0 (98%:00:02%) as control, A (89%:09%02%), B (93%:05%:02%) and C (91%:07%:02%) fueled single-cylinder spark-ignition (SI) engine for power generation and other similar services. Specifically, at load of 0.4kW, 2353Rpm, brake power of 0.65kW, brake mean effective pressure of 254.8kN m²/ was obtained. However, carbon-dioxide emission was quite appreciable at 0.7kW load at 5% ethanol blend which produces 21.5%. Emission characterization shows that emission of CO and HC are eco-friendlier when blended with cassava-ethanol, however, due to higher temperature of combustion as the potency of the spent oil is increased, more NO_x are likely to be formed. When the quantity of air supplied and thus, oxygen is completely utilized that is, combustion is stoichiometric, the use of spent oil is advisable for high speed twostroke engines with fines and other heat dissipation systems modified to handle high temperature, otherwise, operation control systems should be incorporated to restrict the limit of loss of viscosity for the oil to be changed. The presence of lower CO with fuel blend spent oil and ethanol as well as increase in the amount of CO₂ emitted with increase in engine load shows the presence of high carbons in the mixture. Hence the use of spent oil and ethanol as blends is on average beneficent to human and vegetation as reported in [25, 29]. [ABSTRACT FROM AUTHOR]