The conditions of the Motor method represent severe, sustained high speed, high load driving. For most hydrocarbon fuels, including those with either lead or oxygenates, the motor octane number (MON) will be lower than the research octane number (RON).
Test Engine conditions Motor Octane
Test Method : ASTM D2700
Engine : Cooperative Fuels Research ( CFR )
Engine RPM : 900 RPM
Intake air temperature : 38 C or 100F
Intake air humidity: 3.56 - 7.12 g H2O / kg dry air
Intake mixture temperature : 149 C
Coolant temperature: 100 C
Oil Temperature : 57 C
Ignition Advance - variable Varies with compression ratio ( eg 14 - 26 degrees BTDC )
Carburettor Venturi : 14.3 mm
Test Method : ASTM D2700
Engine : Cooperative Fuels Research ( CFR )
Engine RPM : 900 RPM
Intake air temperature : 38 C or 100F
Intake air humidity: 3.56 - 7.12 g H2O / kg dry air
Intake mixture temperature : 149 C
Coolant temperature: 100 C
Oil Temperature : 57 C
Ignition Advance - variable Varies with compression ratio ( eg 14 - 26 degrees BTDC )
Carburettor Venturi : 14.3 mm
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