“…Out of many methods available to control pollutants from SI engine, catalytic converter is effective in reduction of pollutants in SI engine. (Murali Krishna et al, 2000;Murali Krishna et al, 2006;Narasimha Kumar et al, 2010;Murali Krishna et al, 2011a;Murali Krishna et al, 2011b;Murali Krishna et al, 2012a;Murali Krishna et al, 2012b). The reduction of CO and UBHC depends on mass of the catalyst, void ratio (defined as ratio of the volume of the catalyst to the volume of catalytic chamber), temperature of the catalyst, air flow rate, speed and compression ratio of the engine, Engine performance improved with change in fuel composition also (Al-Farayedhi et al, 2004;Abu-Zaid et al, 2004;Nakata, 2006;Pearson, 2007;Bahattin Celik, 2008;Rodrigo, 2010).…”