ignition quality

The lower the value is the better the ignition quality.

The running of all internal combustion engines is dependent on the ignition quality of the fuel.

Diesel is different in that it also has a cetane number limit which describes the ignition quality of the fuel.

Trucks and some cars use similar diesel fuel with a cetane number limit describing the ignition quality of the fuel.

The calculated carbon aromaticity index (CCAI) is an index of the ignition quality of residual fuel oil.

Another reliable method of measuring the derived cetane number of diesel fuel is the Ignition Quality Tester (IQT).

U.S. diesel fuel typically also has a lower cetane number (a measure of ignition quality) than European diesel, resulting in worse cold weather performance and some increase in emissions.

CCAI and CII are two indexes which describe the ignition quality of residual fuel oil, and CCAI is especially often calculated for marine fuels.

Requirements for fuels to be used in diesel engines are the ability of the fuel to flow along the fuel lines, the ability of the fuel to lubricate the injector pump and injectors adequately, and its ignition qualities (ignition delay, cetane number).