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Natural gas internal combustion engines are currently worthy of attention due to the growing interest in energy generation equipments that are both efficient and environmentally friendly. As an answer to this interest, natural gas engine utilizing lean burn combustion technology have been introduced instead of traditional stoichiometric engines with two positive effects. First, excess air in the mixture reduces combustion process temperature, which reduces the formation of NOx with respect to conventional stoichiometric engines. Second, due to excess Oxygen, the combustion process is more efficient and more energy is generated from the same amount of fuel. Another relevant characteristic of mixture leaning is keeping the engine away from the knocking zone.