This International Standard establishes the rating of diesel fuel oil in terms of an arbitrary scale of cetane numbers using a standard single cylinder, four-stroke cycle, variable compression ratio, indirect injected diesel engine. The cetane number is determined at constant speed in a pre-combustion chamber-type compression ignition test engine. However, the relationship of test engine performance to full scale, variable speed, variable load engines is not completely understood.
DS/EN ISO 5165:1998 history
1998DS/EN ISO 5165:1998 Petroleum products - Determination of the ignition quality diesel fuels - Cetane engine method