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Method relates diesel cetane, octane ratings

12/03/2007
A method tested on various diesel blends of known cetane numbers showed a good correlation with the fuel’s octane numbers.Spontaneous ignition results in knock in a spark-ignition engine, whereas spontaneous ignition is required in a diesel engine. In effect, octane number and cetane numbers are opposite measurements of the same phenomenon. Low octane number implies high cetane number.It is advantageous to test diesel fuels in octane test engines that are much more widely available than cetane test engines. To investigate this possibility, we tested 50-50 blends of diesel fuels with iso-octane in a motor octane engine under standard operating conditions. The motor octane test is run...
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