In this last few years, the automotive industry has reinvented itself to meet the demands of the international market, which has been increasingly competitive and stricter with environmental laws. One alternative to lower harmful environmental emissions over the life of the vehicle is Electric cars. However, the production and disposal of electric batteries is still a major problem to be solved. Therefore, companies are also starting to look for other possibilities to increase the engines efficiency and also develop green technology. In this work, computational tools were used to predict the performance of a new technology in the market, called SPCCI (Spark Controlled Compression Ignition). The fuel used in this Project is highly common in Brazil, ethanol. Simulations were made to study the sensitivity of several parameters such as engine speed, engine displacement, compression ratio, air-fuel ratio and crankshaft angle. The results indicate that there are regimes where there is a greater advantage of SPCCI technology over traditional SI (Spark Ignition). For a compression ratio of 18 and a spark angle of -20 Celsius degrees, an efficiency increase of almost 7 percent is achieved, which is enough for a technology that brings with it not only an increase in thermal efficiency but also a drastic decrease in pollutants emission due to its extremely poor fuel mixture. However, there are also working points where the performance with SPCCI is worst. These cases happen in a 12 compression-ratio engine and spark-ignition angle equals to -25 Celsius degrees, which decreases the efficiency by 2 percent in the worst scenario.