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The experimental investigation was conducted on a CI version Ricardo variable compression single cylinder naturally aspirated engine to examine the effects of ceramic coating on performance and exhaust emissions. Tests were carried out at 1500rpm over a wide range of part loads, varying injection timings and compression ratios (CR). The top of the piston was insulated by using Yttria-partially stabilized zirconia with a bond coat alumino boro silicate. The technology by which the piston head was insulated is much more economical and simpler than the plasma-spray process usually used for coating with ceramics. Results show that at 30% of the rated load, BSFC decreases upto 9.99% at 40° injection bTDC (before top dead centre) for CR-19 resulting higher thermal efficiency than base line engine. Ignition delay is longer in ceramic coated engine than its counter part. For CR-18 and 19 these ranges are 1.3% to 7.94% at different injection timings.

A simple and cost effective vitreous enamelling technique is being adopted in the application of thermal barrier coating for internal combustion (IC) engine components. The raw materials including the process of coating are less costly in comparison to plasma spray technique. The coating using yttria partially stabilized zirconia with this technique is found effective for insulation of the engine components. The results obtained from this process are comparable with the published results using plasma spray [1]*. At the speed of 1500 rpm, brake specific fuel consumption (BSFC) decreases upto 9.99% with 200 micron (μ) glass ceramic coating piston whereas with 500 μ coating, it decreases upto 19.67% with advanced injection angle (40° before top dead centre) resulting higher thermal efficiency compared to base line engine.