Lean burn refers to the use of lean mixtures in an internal combustion engine. The air-fuel ratios can be as high as 65:1, so the mixture has considerably less fuel in comparison to the stoichiometric combustion ratio (14.64:1 for petrol for example).
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Famous quotes containing the words lean and/or burn:
“I rather like mysteries. But I do dislike muddles.”
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Old friends burn dim, like lamps in noisome air
Love them for what they are; nor love them less,
Because to thee they are not what they were.”
—Samuel Taylor Coleridge (1772–1834)