variavel0=<b>RAMON MOLINA VALLE</b> - ramon@demec.ufmg.br UNIVERSIDADE FEDERAL DE MINAS GERAIS
<b>Denis Clei Cândido de Sá</b> - dsa@acominas.com.br UNIVERSIDADE FEDERAL DE MINAS GERAIS
<b>Abstract.</b> The torch ignition system consists in the inflammation of the air/fuel mixture by means of gases jet flame, that constitute ignition lines. Engines with this feature have a cavity or a combustion prechamber, physically separate from the main chamber. In such systems it may occur a massive turbulence generation, due the movement of the gases inside the prechamber and through the orifices of the interconnection. The charge stratification, by means of an auxiliary inlet fuel system, also contributes for the fast and safe inflammation of lean combustible mixtures, including the difficult direct spark ignition fuels. The present work reports the design elaboration of a combustion prechamber using an analysis of the influence of the main constructive parameters in the combustion process. The volume of the prechamber, the pattern of the orifices of interconnection with the main chamber and the geometry of the prechamber, together with other parameters, are important to the efficiency of the combustion and consequently the efficiency of the engine and the emissions of pollutants. The reduction of the pollutants emissions, the reduction of the brake specific fuel consumption and the increase of the global efficiency of the engine, are the main benefits obtained with the torch ignition.
<b>Keywords.</b> auxiliary combustion chamber, torch ignition, prechamber ignition, stratified charge.