The present work examines the use of a non–edible vegetable oil namely honne oil, a new possible source of alternative fuel for diesel engine. The use of honne oil (unheated and preheated) in an agricultural direct injection (DI) diesel engine has not been reported in the literature. The high viscosity of honne oil can be reduced by preheating (preheated to 60°C). The effect of temperature on the viscosity of honne oil has been investigated. Using preheated honne oil, brake thermal efficiency (BTE) and exhaust gas temperature (EGT) is increased compared to unheated honne oil. The emissions such as smoke opacity (SO), CO and HC of preheated honne oil were reduced and NOx emissions of preheated honne oil were increased compared to unheated honne oil. Premixed combustion phase of preheated honne oil is better than unheated honne oil and ND. Hence, preheated honne oil could be used in diesel engine for short–term application without any engine modification and adverse effect.
Keywords: vegetable oil, honne oil, DI diesel engines, preheated oil, performance evaluation, engine emissions, combustion, combustion characteristics, calophyllum inophyllum linn oil, biofuels, biodiesel, alternative fuels, oil viscosity, brake thermal efficiency, BTE, exhaust gas temperature, EGT