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octane rating
(redirected from Road octane number)

    Also found in: Wikipedia 0.06 sec.

octane rating

Numerical classification of petroleum fuels indicating their combustion characteristics.

The efficient running of an internal combustion engine depends on the ignition of a petrol-air mixture at the correct time during the cycle of the engine. Higher-rated petrol burns faster than lower-rated fuels. The use of the correct grade must be matched to the engine.



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