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ASTM D2700 MON Test Method

ASTM D2700 MON Test Method

ASTM D2700 (MON) is a standard test method for determining motor octane number of spark-ignition engine fuels using a standardized MON test engine.

ASTM D2700 (MON): Standard Test Method for Motor Octane Number of Spark-Ignition Engine Fuel

ASTM D2700 (MON) laboratory test method is used to rating the spark-ignition engine fuel in Motor Octane Number. The sample fuel is tested using a standardized MON test engine with a single cylinder, four-stroke cycle, variable compression ratio, carburetor. The MON test engine runs in accordance with a defined set of operating conditions. The motor octane number 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 test method has a working range from 40 to 120 octane number. Typical commercial fuels for automotive spark-ignition engines rate in the 80-90 Motor Octane Number range. Typical commercial fuels for aviation spark-ignition engines rate in the 98- 102 Motor octane number range. Testing of gasoline blends or other process stream materials can produce ratings at various levels throughout the Motor Octane Number.

ASTM D2700 (MON) Application:

  • Motor Octane Number correlates with commercial automotive spark-ignition engine antiknock performance under severe conditions of operation.
  • Motor Octane Number is used by engine manufacturers, petroleum refiners and in commerce as a primary specification measurement related to the matching of fuels and engines.
  • Motor Octane Number is used for measuring the antiknock performance of spark-ignition engine fuels that contain oxygenates.
  • Motor Octane Number is important in relation to the specifications for spark-ignition engine fuels. That is used in stationary and other nonautomotive engine applications.
  • Motor Octane Number is utilized to determine, by correlation equation, the Aviation method octane number or performance number of aviation spark-ignition engine fuel.
RON MON CFR test engine ASTM D2700 D2699

For more details about ASTM D2700 MON test engine, please visit

For referenced ASTM standards, visit the ASTM website,

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