BS EN ISO 5163:2014

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents and reference materials
6 Apparatus
7 Sampling and sample preparation
8 Basic engine and instrument settings and standard
   operating conditions
9 Engine calibration and qualification
10 Procedure
11 Calculation
12 Expression of results
13 Precision
14 Test report
Annex A (informative) - Test variable characteristics
Bibliography

Describes the rating of liquid spark-ignition engine fuel in terms of an arbitrary scale of octane numbers using a standard single-cylinder, four-stroke cycle, variable-compression ratio, carbureted, CFR engine operated at constant speed.

This International Standard establishes the rating of liquid spark-ignition engine fuel in terms of an arbitrary scale of octane numbers using a standard single-cylinder, four-stroke cycle, variable-compression ratio, carburetted, CFR engine operated at constant speed. Motor octane number (MON) provides a measure of the knock characteristics of motor fuels in automotive engines under severe conditions of operation. The motor octane number provides a measure of the knock characteristics of aviation fuels in aviation piston engines, by using an equation to correlate to aviation-method octane number or performance number (lean-mixture aviation rating).

This International Standard is applicable for the entire scale range from 0MON to 120MON, but the working range is 40MON to 120MON. Typical motor fuel testing is in the range of 80MON to 90MON. Typical aviation fuel testing is in the range of 98MON to 102MON.

This International Standard is applicable for oxygenate-containing fuels containing up to 4,0%(m/m) oxygen and for gasoline containing up to 25%(V/V) ethanol.

NOTE1 Although 25%(V/V) of ethanol corresponds to approximately 9%(m/m) oxygen, full applicability of this test method for that oxygen range has only been checked for gasoline type of fuels.

NOTE2 Work is under way to check the possibility to use the method for gasoline containing up to 85% (V/V) ethanol.

NOTE3 This International Standard specifies operating conditions in SI units but engine measurements may be specified in inch-pound units because these were the units used in the manufacture of the equipment, and thus some references in this International Standard include these units in parenthesis.

NOTE4 For the purposes of this standard, the terms “% (m/m)” and “% (V/V)” are used to represent the mass fraction, µ, and the volume fraction, φ, of a material respectively.