Standard Test Method for Motor Octane Number of Spark-Ignition Engine Fuel

Importancia y uso:

5.1 Motor O.N. correlates with commercial automotive spark-ignition engine antiknock performance under severe conditions of operation.

5.2 Motor O.N. is used by engine manufacturers, petroleum refiners and marketers, and in commerce as a primary specification measurement related to the matching of fuels and engines.

5.2.1 Empirical correlations that permit calculation of automotive antiknock performance are based on the general equation:

Values of k₁, k₂, and k₃ vary with vehicles and vehicle populations and are based on road-octane number determinations.

5.2.2 Motor O.N., in conjunction with Research O.N., defines the antiknock index of automotive spark-ignition engine fuels, in accordance with Specification D4814. The antiknock index of a fuel approximates the road octane ratings for many vehicles, is posted on retail dispensing pumps in the United States, and is referred to in vehicle manuals.

This is more commonly presented as:

5.3 Motor O.N. is used for measuring the antiknock performance of spark-ignition engine fuels that contain oxygenates.

5.4 Motor O.N. is important in relation to the specifications for spark-ignition engine fuels used in stationary and other nonautomotive engine applications.

5.5 Motor O.N. is utilized to determine, by correlation equation, the Aviation method O.N. or performance number (lean-mixture aviation rating) of aviation spark-ignition engine fuel.7

Subcomité:

D02.01

Referida por:

D6424-25, D2885-21R25, D7547-23, D8076-24, D1310-14R21, D8111-25, D0910-24, D8275-22, D4814-25, D6227-24A, D8291-25, D8603-25, D1094-24, D6812-25, D8631-25, D7719-21A, D8434-21, D8340-22, D7960-21, D2699-25, D7826-25A, D4814-25, D6709-25, D6593-18E01, D4814-25, D6984-18E01, D7320-18E01

Volúmen:

05.05

Número ICS:

75.160.20 (Liquid fuels)

Palabras clave:

aviation rating; guide table; isooctane; knock intensity; motor octane number; n-heptane; spark-ignition engine fuel performance; toluene standardization fuel ;