I am doing a thesis work and I am trying to figure out the amount of C02 and the products in combustion of Air and C8H18. Its known that the engine is operating on lean fuel, but I am having trouble with the reaction formula. This is not my subject. The engine is operating at lambda 1.2 to 1.6. (Phi = 0.83 - 0.62). Here is my try: 0.83 C8H18 + 12.5O2 + 94N2 <--> 6.64C02 + 7.47 H20 + 94 N2 + 2.12 O2 ? 0.62 C8H18 + 12.5O2 + 94N2 <--> 4.96C02 + 5.58 H20 + 94 N2 + 4.7 O2 ? Is there something wrong here? Does this really happen as the fuel + air ignite?