Cetane numbers are tested using a special test engine and the existing engine was not made for residual fuels. For residual fuel oil two other empirical indexes are used: CCAI and Calculated Ignition Index (CII).
Cetane numbers are assessed using a specialized test engine, and the existing engine was not designed for residual fuels. For residual fuel oil, two additional empirical indexes are employed: CCAI (Corrected Cetane Index) and Calculated Ignition Index (CII).