What does octane number stand for? R stands for RON, or research octane number, and M stands for MON, or motor octane number. These numbers are the results of the fuel being tested in two different ways. The research octane number is derived from calculations performed, based the blend of the fuel and how it should perform in theory.What is an octane number and how is it found? Octane number, also called Antiknock Rating, measure of the ability of a fuel to resist knocking when ignited in a mixture with air in the cylinder of an internal-combustion engine.The octane number is determined by comparing, under standard conditions, the knock intensity of the fuel with that of blends of two reference fuels: iso-octane, which resists knocking, and heptane, which knocks readily.How to calculate octane number? First you need to calculate the percentage of each fuel that will be in the final mixture. Then, use this equation to find your octane: ( [ % Fuel A ] x [ Octane of Fuel A ] ) + ( [ % Fuel B ] x [ Octane of Fuel B ] ) = Octane of Mixture Here's an example.What is the significance of the octane number? Updated September 09, 2019. The octane number seen on pumps at gasoline stations is a value used to indicate the resistance of a motor fuel to knock -that is, to make pinging or ticking sounds in a car's engine when you step on the gas pedal. Octane number is also known as octane rating.
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