What is Cetane Number?

What is Cetane Number?

Cetane number is a measure of the ignition quality of distillate fuels. It is measured using a single-cylinder engine that determines the compression-ignition quality. Higher cetane value improves cold start performance, reduces noise and may reduce emissions. An increase in cetane number above the engine's requirement may not improve performance. A cetane number of 40 is the current U.S. minimum requirement for diesel fuel.