Octane Number 2
Octane Number 2 : A measure of the resistance of a sample of gasoline to premature ignition in an internal combustion engine (knocking). 100 octane fuel has the knocking resistance of 100% iso-octane: (2,2,4-trimethyl pentane). Zero octane fuel has the knocking resitance of n-heptane. 89 octanes: fuel has the knocking resitance of a mixture of 89% iso-octane and 11% n-heptane. At present three systems of octane rating are used in the United States. Two of these, the research octane: and motor octane numbers, are determined by burning the gasoline in an engine under different, but specified, conditions. Usually the motor octane number is lower than the research octane. The third octane rating, which federal regulations require on commercial gasoline pumps, is an average of research octane and motor octane. Syn: Octane rating
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