Octane number & Cetane number | Skill-Lync

In a petrol bunk, you might have seen some numbers flashing along with litres, these numbers denote the quality of the fuel. The quality of gasoline is measured by octane number whereas the quality of diesel is measured by cetane number.

The whole purpose of the video is to understand what these numbers indicate, why are they so important and how are they calculated.

Octane number:

Octane number denotes the ability of the fuel to resist knocking. Higher the octane number, fewer chances of knocking. Thus, engine performance will be better. The octane number of iso-octane is 100 and n-heptane is 0. These two compounds are used as reference elements for calculating the octane number. Based on the engine operating conditions, the octane number can be measured in two scales: Research Octane Number and Motor Octane Number. The average of these two is known as Anti-knock index. The difference between these two is known as Fuel Sensitivity. Different countries use different octane ratings.

Cetane number:

Cetane number denotes how fast the fuel can be ignited. Higher the cetane number, lesser the ignition delay which eventually increases the engine performance. The reference elements for measuring cetane numbers are cetane and 2-methylnaphthalene with cetane number 100 and 0 respectively.

These numbers do not refer to the composition of the fuel. But, it indicates the quality performance of the fuel by comparing it with the fuel that is a mixture of these standard elements. Using a good quality fuel results in high engine performance.

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