CONTROL OF EXHAUST EMISSIONS OF TWO STROKE AND FOUR STROKE COPPER COATED SPARK IGNITION ENGINES

Alcohols are important substitutes for gasoline, as their properties are comparable to gasoline. They are renewable in nature. Investigations were carried out to determine exhaust emissions of two stroke and four stroke of single cylinder, spark ignition (SI)engine having copper coated engine [CCE, copper-(thickness, 300 μ) coated on piston crown and inner side of cylinder head] provided with catalytic converter with copper as catalyst with methanol blended gasoline (80% gasoline and 20% methanol by volume) and compared with conventional engine (CE) with neat gasoline operation. Carbon monoxide (CO) and un-burnt hydrocarbons (UBHC) are the exhaust emissions from SI engine. Breathing of these emissions causes human hazards and also they cause environmental disorders. Hence control of these emissions is an urgent task. Exhaust emissions were varied with different values of brake mean effective pressure (BMEP). The engine was provided with catalytic converter with copper as catalyst. There was provision for injection of air into the catalytic converter. CCE showed improvement in the pollutants when compared with CE with both test fuels. Four-Stroke engine decreased exhaust emissions effectively in comparison with two-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