D2700 1.1 This
laboratory test method covers the quantitative determination of the
knock rating of liquid spark-ignition engine fuel in terms of Motor
octane number except that this test method may not be applicable to fuel
and fuel components that are primarily oxygenates. The sample fuel is
tested in a standardized single cylinder, four-stroke cycle, variable
compression ratio, carbureted, CFR engine run in accordance with a
defined set of operating conditions. The octane number scale is defined
by the volumetric composition of primary reference fuel blends. The
sample fuel knock intensity is compared to that of one or more primary
reference fuel blends. The octane number of the primary reference fuel
blend that matches the knock intensity of the sample fuel establishes
the Motor octane number. 1.2 The octane
number scale covers the range from 0 to 120 octane number, but this test
method has a working range from 40 to 120 octane number. Typical
commercial fuels produced for automotive spark-ignition engines rate in
the 80 to 90 Motor octane number range. Typical commercial fuels
produced for aviation spark-ignition engines rate in the 98 to 102 Motor
octane number range. Testing of gasoline blend stocks or other process
stream materials can produce ratings at various levels throughout the
Motor octane number range.
Standard Test Methods
for
Motor Octane Number of Spark-Ignition Engine Fuel
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