It is observed that the brake thermal efficiency
increases with the increase of biodiesel in the blends of biodiesel and diesel.
The results showed reduction in ignition delay period, heat release rate, cylinder peak pressure, carbon monoxide, carbon dioxide, and oxides of nitrogen emissions while the brake thermal efficiency
and unburned hydrocarbon emissions were increased.
The addition of syngas would slightly reduce the brake thermal efficiency
of the engine and increase carbon monoxide emission.
B20 is found to have the maximum brake thermal efficiency
at higher loads among the blends.
The behaviour of the brake thermal efficiency
is inverse to the behaviour of the BSFC for each fuel.
The performance parameters such as brake power (BP), brake specific fuel consumption (BSFC), and brake thermal efficiency
(BTE) have been calculated using the collected test data [24, 25].
Brake Thermal efficiency
([[eta].sub.bt]) = (BP * 3600 * 100) / (TFC * CV) (%)
Experimental evaluation of Brake thermal efficiency
, CO, HC and C[O.sub.2]
Because of these reasons, the reported result of researches in this area has been inconsistent  as far as the brake thermal efficiency
, brake specific fuel consumption, and pollutant formation are concerned.