The running of all internal combustion engines is dependent on the ignition quality of the fuel.
Both CCAI and CII are calculated from the density and kinematic viscosity of the fuel.
In case of high CCAI, the manufacturers recommendations and guidance limits should be consulted to ensure that the fuel falls within the permissible range for the engine type.
Attention should be given to the combustion profile, peak pressures and exhaust temperatures on the Engine.
As the name suggests, CCAI is a calculation based on the density and viscosity of a given fuel.
The formula is rather complex but in general, the higher the CCAI, the poorer the ignition quality of the fuel is considered to be.
Studies carried out by engine manufacturers indicate that combustion related problems caused by fuels with high CCAI can be reduced by avoiding running the engine at part load.