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The cetane number of a fuel is defined by finding a blend of cetane and isocetane with the same ignition delay. Cetane has a cetane number defined to be 100, while isocetane's measured cetane number is 15, replacing the former reference fuel alpha-methylnaphthalene, which was assigned a cetane number of 0.
Cetane index is used as a substitute for the cetane number of diesel fuel. The cetane index is calculated based on the fuel's density and distillation range (ASTM D86). There are two methods used, ASTM D976 and D4737. The older D976, or "two-variable equation" is outdated and should no longer be used for cetane number estimation.
Several indices are used to characterise fuels. [2] For spark-ignition engines the fuel has an octane rating. For diesel engines it depends on the type of fuel, for distillate fuels the cetane numbers are used. Cetane numbers are tested using a special test engine, however, the existing test engine was not intended for residual fuels.
The principal measure of diesel fuel quality is its cetane number. A cetane number is a measure of the delay of ignition of a diesel fuel. [32] A higher cetane number indicates that the fuel ignites more readily when sprayed into hot compressed air. [32] European (EN 590 standard) road diesel has a minimum cetane number of 51.
Sunoco Race Fuels is a refiner and distributor of racing fuels. Originally featuring two high-octane options (Sunoco 260 and 280), Sunoco Race Fuels now produces 18 different high-performance fuel blends, which are used for all types of professional motorsports. All Sunoco Race Fuels products are refined at Sunoco LP's Marcus Hook facility. [89]
The running of all internal combustion engines is dependent on the ignition quality of the fuel. For spark-ignition engines the fuel has an octane rating. For diesel engines it depends on the type of fuel, for distillate fuels the cetane numbers are used. Cetane numbers are tested using a special test engine and the existing engine was not made ...
The cetane number is a key property of diesel fuel, as it measures its aptitude to self-ignite in the combustion chamber. [8] The auto ignition temperature of diesel fuel is around 220 °C (428 °F) at atmospheric pressure. Cetane improver additives are used to decrease this temperature and lead to quicker combustion, by increasing the cetane ...
Hexadecane (also called cetane) is an alkane hydrocarbon with the chemical formula C 16 H 34. Hexadecane consists of a chain of 16 carbon atoms , with three hydrogen atoms bonded to the two end carbon atoms, and two hydrogens bonded to each of the 14 other carbon atoms.