lean fuel mixture

lean fuel mixture

[′lēn ′fyül ‚miks·chər]
(mechanical engineering)
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It is the use of a lean fuel mixture in the HCCI engine that prevents the autoignition of the fuel from damaging the engine.
"Because we can predict when we are going to have to start the engine," says Louckes, "this allows us to preheat the catalyst, warm the combustion chamber, and run the engine on a lean fuel mixture, which drastically reduces emissions and oil contamination," says Louckes.
This is valid for homogeneous charge and lean fuel mixtures. The factor x has a value of 6 as the HC emissions reported in this article were in hexane equivalent.
What's more, lean fuel mixtures and alternative fuels are more difficult to ignite.
The lean fuel mixtures, studied in a cylinder roughly 30 centimeters in diameter, generated unusually cool flames with about one-hundredth the power of a common match flame, says project scientist Karen J.