Air-Fuel Ratio (A/F Ratio)

The mass of air supplied to the engine divided by the mass of fuel supplied in the same period of time.

The stoichiometric, or chemically correct, air-fuel ratio is the exact ratio necessary to burn all the carbon and hydrogen in the fuel to carbon dioxide and water with no oxygen remaining.

The fuel-air ratio is the reciprocal of the air-fuel ratio.


See also: Air Injection, Combustion, Exhaust Gas Oxygen.

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Subjects: Engines