Application Notes:
 

lean & rich octane number


is the expression of the antiknock value of an aviation gasoline at lean air-fuel mixtures (relatively low concentration of fuel) and rich air-fuel mixtures, respectively. A grade designation of 80/87 means that at lean mixtures the fuel performs like an 80-octane gasoline and at rich mixtures, like an 87-octane gasoline.

Also see performance number.

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