- The octane number indicates a fuel’s resistance to knocking in engines.
- Higher octane number fuels resist pre-ignition better under compression.
- Knocking occurs when fuel ignites prematurely in the engine cylinder.
- Iso-octane is assigned an octane number of 100 as a standard reference.
- n-Heptane is assigned an octane number of 0 as it ignites easily.
- The octane rating of fuel is determined by comparing it with a mixture of iso-octane and n-heptane.
- Higher compression engines require fuels with a higher octane number.
- Anti-knock additives, like tetraethyl lead, were historically used to increase octane number.
- RON (Research Octane Number) is measured under low-speed, mild conditions.
- MON (Motor Octane Number) is measured under high-speed, severe conditions.
- Fuel with higher RON and MON ensures smooth engine performance and efficiency.
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