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Georgecls,


Cetane index is a measure of the ability of the fuel to burn. In fact, it is the intervall between the beginning of injection and autoignition. The higher the number, the faster and easier the fuel burns.


Low cetane fuel tend to burn unevenly and slower, creating noise and smoke, and even rough operation of the engine. With low cetane fuel, the ignition sometimes is happening after TDC, which causes a too late pressure rise, incomplete combustion and accompanying power and fuel economy loss.
 
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