- air-fuel mixture ratio
- The ratio by weight of air and fuel in the mixture being sent into the cylinders of a reciprocating engine. Ideally, the ratio should be 15:1. Besides the ideal (stoichiometric) ratio, the air-fuel mixture may be rich or lean depending on the quantity of fuel in the mixture. With more fuel, the mixture is rich, and with less fuel, it is a weak or lean mixture.
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lean air-fuel mixture — A mixture of air and fuel in which there is more air and less fuel. See air fuel ratio … Dictionary of automotive terms
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