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The present paper is concentrated on the effect of Yttria Stabilized Zirconia coated with its piston crown on the performance and emission characteristics of a diesel engine. The piston crown top surface was fully coated with 7% YSZ with a thickness of 0.25 mm and in the bond coat NiCrAlY were used with a thickness of 0.05 mm which is deposited on the target surface using plasma spray technique. The present analysis is carried out in a four-stroke single cylinder diesel engine with diesel fuel, Mahua and jatropha biodiesel under different loading conditions. Results of this study reveal that the brake thermal efficiency of a 7% YSZ coated engine with diesel as a fuel is increased by 10.4% along with a decrease of brake specific fuel consumption of a 7% YSZ by 13.1%. In coated engines the Hydrocarbon (HC) emissions and carbon monoxide (CO) emissions were reduced by 16 % and but the Nitrogen oxide (NOx) emission was marginally increased by 18.87%.

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