Measuring Cetane Number
Accurate measurements of the cetane number is rather difficult, as it requires burning the fuel in a rare diesel engine called a Cooperative Fuel Research(CFRTM) engine, under standard test conditions. The operator of the (CFRTM)engine uses a hand-wheel to increase the compression ratio (and therefore the peak pressure within the cylinder) of the engine until the time between fuel injection and ignition is 2.407ms. The resulting cetane number is then calculated by determining which mixture of cetane (hexadecane) and isocetane (2,2,4,4,6,8,8-heptamethylnonane) will result in the same ignition delay.
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