Experimental Investigation on Exhaust Emission with & Without MOLY Coated Piston Ring in C. I. Engine

Now a day's various surface treatment methods are used on cylinder piston group (CPG) components to reduce exhaust gases. The wear resistance of thermal sprayed molybdenum coatings applicable to the piston ring was investigated in this study. Among thermal spraying methods, plasma spraying is most widely applied in the automotive industries, because it has a high spray rate and deposition, the process consumes fuel gases which are inexpensive and easily obtainable. Wear resistance of the moly coated piston ring is very high as compare to the ordinary cast-iron ring. So less wear of the moly coated ring, which improve compression characteristics and reduce leakage of engine oil in the combustion chamber from the ring gap or looseness of the ring. Experimental results shows that, by using Moly coated piston ring in the 4-stroke single cylinder C.I.Engine, HC reduces by 7.7%, NOx reduces by 2.29%,CO reduces by 3.73% and CO2 reduces by 7.73% after 100hr running cycle of the engine with compare to the cast-iron piston ring. It is therefore concluded that development of Moly coated piston ring is feasible since it gave satisfactory results for given operating conditions and reduction of HC, NOx, CO and CO2 emissions.