Octane number – Conditional indicator of the anti-detonation properties of motor fuels. Engine fuel is compared to a mixture of isooctane (taken as 100) and H-Heptane (taken as 0). The percentage of isooctane in the mixture that is equivalent in detonation resistance to the fuel tested is called the octane number of the fuel. There are 2 methods of determination – motor and research.
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