1.1 This laboratory test method covers the quantitative determination of the knock rating of liquid spark-ignition engine fuel in terms of Research O.N., including fuels that contain up to 25 % v/v of ethanol. However, this test method may not be applicable to fuel and fuel components that are primarily oxygenates.2 The sample fuel is tested using a standardized single cylinder, four-stroke cycle, variable compression ratio, carbureted, CFR engine run in accordance with a defined set of operating conditions. The O.N. scale is defined by the volumetric composition of PRF blends. The sample fuel knock intensity is compared to that of one or more PRF blends. The O.N. of the PRF blend that matches the K.I. of the sample fuel establishes the Research O.N.
1.2 The O.N. scale covers the range from 0 to 120 octane number but this test method has a working range from 40 to 120 Research O.N. Typical commercial fuels produced for spark-ignition engines rate in the 88 to 101 Research O.N. range. Testing of gasoline blend stocks or other process stream materials can produce ratings at various levels throughout the Research O.N. range.
1.3 The values of operating conditions are stated in SI units and are considered standard. The values in parentheses are the historical inch-pound units. The standardized CFR engine measurements continue to be in inch-pound units only because of the extensive and expensive tooling that has been created for this equipment.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific warning statements, see Section 8, 14.4.1, 15.5.1, 16.6.1, Annex A1, A2.2.3.1, A2.2.3.3 (6) and (9), A2.3.5, X3.3.7, X4.2.3.1, X4.3.4.1, X4.3.9.3, X4.3.11.4, and X4.5.1.8.
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, including fuels that contain up to 25 % v/v of ethanol. However, this test method may not be applicable to fuel and fuel components that are primarily oxygenates.2 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.
1.3 The values of operating conditions are stated in SI units and are considered standard. The values in parentheses are the historical inch-pounds units. The standardized CFR engine measurements continue to be in inch-pound units only because of the extensive and expensive tooling that has been created for this equipment.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For more specific hazard statements, see Section 8, 14.4.1, 15.5.1, 16.6.1, Annex A1, A2.2.3.1, A2.2.3.3(6) and (9), A2.3.5, X3.3.7, X4.2.3.1, X4.3.4.1, X4.3.9.3, X4.3.12.4, and X4.5.1.8.
ASTM RR-D02-1870 2017 Referenced Document
ASTM D1193 Standard Specification for Reagent Water*, 1999-04-21 Update
ASTM D2268 Standard Test Method for Analysis of High-Purity n-Heptane and Isooctane by Capillary Gas Chromatography*, 2017-10-01 Update
ASTM D2360 Standard Test Method for Trace Impurities in Monocyclic Aromatic Hydrocarbons by Gas Chromatography*, 2024-04-21 Update
ASTM D2699 Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel*, 1999-04-21 Update
ASTM D2700 Standard Test Method for Motor Octane Number of Spark-Ignition Engine Fuel*, 1999-04-21 Update
ASTM D2885 Standard Test Method for Research and Motor Method Octane Ratings Using On-Line Analyzers*, 1995-04-21 Update
ASTM D3703 Standard Test Method for Peroxide Number of Aviation Turbine Fuels*, 1999-04-21 Update
ASTM D4057 Standard Practice for Manual Sampling of Petroleum and Petroleum Products*, 1995-04-21 Update
ASTM D4175 Standard Terminology Relating to Petroleum Products, Liquid Fuels, and Lubricants*, 2023-07-01 Update
ASTM D4177 Standard Practice for Automatic Sampling of Petroleum and Petroleum Products*, 1995-04-21 Update
ASTM D4814 Standard Specification for Automotive Spark-Ignition Engine Fuel*, 1995-03-23 Update
ASTM D5842 Standard Practice for Sampling and Handling of Fuels for Volatility Measurement*, 1995-04-21 Update
ASTM D6299 Standard Practice for Applying Statistical Quality Assurance and Control Charting Techniques to Evaluate Analytical Measurement System Performance*, 2023-07-01 Update
ASTM D6304 Standard Test Method for Determination of Water in Petroleum Products, Lubricating Oils, and Additives by Coulometric Karl Fischer Titration*, 2020-12-01 Update
ASTM E1064 Standard Test Method for Water in Organic Liquids by Coulometric Karl Fischer Titration*, 2024-01-01 Update
ASTM E344 Terminology Relating to Thermometry and Hydrometry*, 2023-12-01 Update
ASTM E456 Standard Terminology for Relating to Quality and Statistics*, 1996-04-21 Update
ASTM E542 Standard Practice for Gravimetric Calibration of Laboratory Volumetric Instruments*, 2022-01-01 Update