Significado
Relação, em massa ou volume, entre combustível e ar.
Meaning
The mixture of air and fuel that goes into the engine's cylinders for combustion must contain a certain amount of fuel in order to burn efficiently. This amount of fuel relative to the amount of air in the mixture is called the air fuel ratio. If the ratio is just right (stoichiometric air-fuel ratio), it can be burned in the engine with maximum efficiency. If there is too much fuel (rich air-fuel ratio), not all of the fuel will be burned completely and high carbon monoxide emissions will result. If there is not enough fuel (lean air-fuel ratio), the combustion of the mixture may stop prematurely and high hydrocarbon emissions will result.
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