Experimental investigations on exhaust emissions of copper coated engine with methanol blended gasoline

Investigations were carried out to evaluate the exhaust emissions of two stroke and four stroke of single cylinder, spark ignition (SI) engine having copper coated engine [CCE, copper- (thickness, 250 ) coated on piston crown and inner side of cylinder head] provided with catalytic converter with copper as catalyst with methanol blended gasoline (85% gasoline and 15% methanol by volume) and compared with conventional engine (CE) with neat gasoline operation. Exhaust emissions of carbon mono oxide (CO), unburnt hydro carbons (UBHC) were varied with different values of brake mean effective pressure (BMEP). Aldehdyes were measured at full load operation of the engine. The engine was provided with catalytic converter with copper as catalyst. There was provision for injection of air into the catalytic converter. Brake thermal efficiency increased with methanol blended gasoline with both versions of the engine. CCE showed improvement in the performance when compared with CE with both test fuels. 4-Stroke engine decreased exhaust emissions effectively in comparison with 2-stroke engine with both versions of the engine. Catalytic converter with air injection significantly reduced pollutants with different test fuels on both configurations of the engine.