Description
This article is from the Gasoline
FAQ, by Bruce Hamilton with numerous contributions by
others.
6.11 What is a "delta Research Octane number"?
To obtain an indication of behaviour of a gasoline during any manifold
segregation, an octane rating procedure called the Distribution Octane
Number was used. The rating engine had a special manifold that allowed
the heavier fractions to be separated before they reached the combustion
chamber [27]. That method has been replaced by the "delta" RON procedure.
The fuel is carefully distilled to obtain a distillate fraction that boils
to the specified temperature, which is usually 100C. Both the parent fuel
and the distillate fraction are rated on the octane engine using the
Research Octane method [107]. The difference between these is the delta
RON(100C), usually just called the delta RON. The delta RON ratings are
not particularly relevant to engines with injectors, and are not used in
the US.
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