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2117859 
Journal Article 
Method relates diesel cetane, octane ratings 
Morris, W 
2007 
0 
Oil and Gas Journal
ISSN: 0030-1388 
PennWell Corporation 
105 
45 (Dec 3 
58-60 
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, the researchers 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 at a high temperature, which should favor operability with diesel fuel blends. They carried out the tests with six diesel fuels of known cetane number, resulting in a good correlation. 
United States--US; Petroleum refining; Engines; Testing; Diesel fuels; Correlation analysis; 2007)