The production of biodiesel from sapota seed has potential to replace conventional diesel fuel due to its chemical characteristics. Sapota seed biodiesel has potential for reducing harmful pollutant emissions, however it has an engine performance bar below the diesel fuel. This research analysed sapota seed biodiesel in a thermal barrier-coated compression ignition (CI) engine as a solution to address the problem. In this research work, the combustion chamber parts – piston head and cylinder liner – are coated with alumina (Al2O3) and yttria-stabilised zirconia materials. The utilisation of an 80% blend of sapota seed biodiesel in a thermal barrier CI (TBC + BD 80) engine is considered a unique and innovative approach in the field of scientific investigation. The outcome of TBC + BD 80 showed that notable reduction in average specific fuel consumption. Specifically, there was a decrease of 13.47% and 20.78%. In addition, the brake thermal efficiency showed a significant improvement of 3.81% and 6.19% compared to conventional diesel fuel and biodiesel blend respectively. A decrease of 0.0196% in the volume of carbon monoxide was observed. In addition, there was a reduction of 12.6 ppm in the emission of unburned hydrocarbons. Additionally, a decrease of 8.16% in smoke opacity was observed. The concentration of NOx measured showed an increase of 425 ppm compared to the diesel fuel.
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