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The relationship between engine load with Thermal Coating Piston - Yttria Stabilized Zirconia (YSZ) and Ferric Chloride (FeCl3) as additive on engine Using conventional diesel and Pumpkin Methyl Ester (PME). Initially the experimental run with pure diesel then the piston is modified with Yttria Stabilized Zirconia and addition of FeCl3, then the same type of experimental have been carried under the Pumpkin Methyl Ester with coating (YSZ) and FeCl3 additive. The result of the experiment with performance of BTE increases with coated engine (YSZ) and decreases by addition of FeCl3, PME blend results has decreases and increases with (YSZ) and decreases by addition of FeCl3. BSFC results increased with all condition because the blend and thermal coating had a higher viscosity and lower energy content. The emission results such as CO, HC NoX and smoke were the NoX is slightly increased when compared to other emission in future the impact of adopting a varied compression ratio and technique to analysis the NoX emission control. [ABSTRACT FROM AUTHOR]