The crude oil resources are depleting as the days progress and biodiesel is an emerging substitute. But the usage of biodiesel is associated with fuel atomization problems. The prime cause is the high viscous nature of oils obtained from green matter. As we know that with increase in temperature of oil viscosity decreases. Current work deliberates the influence of preheating of biofuel on the engine output parameters. DI diesel engine fuelled with preheated biofuel blends result in increase in thermal efficiency and drop in HC, CO emissions, but the rise in peak cylinder temperature resulted in increase in NO_x emissions.

In the present study an experimental work has been conducted to characterize the fish oil biodiesel and their blends with diesel and Pyrogallol antioxidant respectively. Fish oil biodiesel (FHOBD) is blended with diesel to produce FHOBD B20. Further to study the effect of antioxidant addition to FHOBD B20, three blends with varied dosage of pyrogallol are prepared. Accordingly, FHOBD B20 is infused with 1, 2, and 3 grams of pyrogallol antioxidant per liter to produce FHOBD B20PG1, FHOBD B20PG2 and FHOBD B20PG3 respectively. Beyond 3 gm deterioration in the blend homogeneity is observed. For the CRDI engine performance evaluation only FHOBD B20PG3 is considered. Advancing the injection timing to 17o BTDC resulted into improved CRDI engine performance powered with fish oil biodiesel. Further adding Pyrogallol antioxidant into FHOBD B20 blends higher BTE, lower emissions of smoke, HC and CO emissions were obtained for the CRDI engine respectively.