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 climb to the tower-top and lean upon broken stone,
A mist that is like blown snow is sweeping over all,
Valley, river, and elms, under the light of a moon
That seems unlike itself, that seems unchangeable,
A glittering sword out of the east.”
—William Butler Yeats (1865–1939)
“All things are flowing, even those that seem immovable. The adamant is always passing into smoke. The plants imbibe the materials which they want from the air and the ground. They burn, that is, exhale and decompose their own bodies into the air and earth again. The animal burns, or undergoes the like perpetual consumption. The earth burns, the mountains burn and decompose, slower, but incessantly.”
—Ralph Waldo Emerson (1803–1882)