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The interest of using alternative fuels in Diesel engines has been accelerated exponentially due to a foreseen scarcity in world petroleum reserves and restrictions on exhaust emissions. Alcohol which is bio-based renewable and oxygenated fuel provides a suitable alternate fuel for internal combustion engines. In this regard, exploration of potential for higher alcohols in automotive application is needed. Long chain alcohols such as pentanol and hexanol despite their analogous properties have rarely been inspected. The n-hexanol, the longer chain alcohol is used to be fueled with diesel. These oxygenated additives allow the fuel to increase combustion efficiency due to the presence of oxygen. In the present investigation, two blends of hexanol and diesel were prepared. All the blends were found to be homogenous and stable. The brake thermal efficiency for all the blends was observed to be slightly higher in comparison to neat diesel. The maximum brake thermal efficiency was obtained with B20 blend. Similarly, minimum total fuel consumption was obtained for B20 blend while rest of the blend showed a reduction in total fuel consumption. The CO emissions were found to get reduced with increase in hexanol percentage in the blends. The HC emissions were observed to increase as the percentage of hexanol increases on the blend. The NOx emissions increased with increase in engine load for all test fuels. Finally, concluded that a blend of B20% hexanol in diesel will result in better engine performance and emissions of CO2, CO, and NOx.

Bio-fuels are proved to be very good substitutes for the existing petroleum fuels. Blends of biodiesel extracted from Tamanu oil (B100, B80, B60, B40, and B20) along with induction of biogas with constant mass flow of 2.313 * 10-5 kg/s are used for conducting performance and emission analysis. The tests are carried out at 0%, 25%, 50%, 75% and 100% load conditions. Among the blends B20, B40 and B100 have shown a better performance with respect to brake thermal efficiency, mechanical efficiency and specific fuel consumption. All blends show reduction in HC when compared to diesel. But NO x emission increases with increase in load. But, CO has slightly increased for the induction of biogas compared to the diesel at all load conditions. Experimental investigations show that blending of Tamanu oil methyl esters along with biogas can be used in diesel engine without any modification and also it reduces the harmful emissions.

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