This laboratory test method covers the quantitative determination of the knock rating of liquid spark-ignition engine fuel in terms of Research O.N. and the Motor Octane Number, including fuels that contain up to 25% v/v of ethanol. 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 Combination Octane Rating Unit with Digital Control Panel is the latest model of octane engines with many easy to use features including automatic functions and enhanced documentation capabilities, conforming to the latest ASTM D2699 (RON) and ASTM D2700 (MON) Test Methods.
The Digital Control Panel delivers consistent and reliable test results, with standard features including on-screen operation, reports, falling level program, automated data recording, auto-set and auto-calculated system, integrated maintenance logs and a comprehensive safety system.
Conforms to the specifications of: ASTM D2699 and ASTM D2700
Working Range: 40 – 120 Octane Number
Operation Conditions:
Cylinder Jacket Coolant Temperature: 100°C ± 1.5°C
Crankcase Oil Temperature: 57°C ± 8.5°C
MON Conditions:
Engine Speed: 900 ± 9 rpm
Ignition Timing: Variable as Cylinder Height is changed
Intake Air Temperature: 38°C ± 1°C
Intake Mixture Temperature: 149°C ± 1°C
RON Conditions:
Engine Speed: 600 ± 6 rpm
Ignition Timing: 13° BTDC
Intake Air Temperature: 52°C ± 1°C
Engine Information:
Compression Ratio (C.R.): 4:1 – 18:1
Cylinder Bore (diameter): 82.55 mm
Stroke: 114.30 mm
Carburetor Venturi (Research): 14.30 mm
Intake Valve Clearance (Hot): 0.20 mm ± 0.025 mm
Exhaust Valve Clearance: 0.20 mm ± 0.025 mm
Intake Valve Opens Timing: 10° ± 2.5° ATDC
Intake Valve Closes Timing: 34° ABDC
Exhaust Valve Opens Timing: 40° BBDC
Exhaust Valve Closes Timing: 15° ± 2.5° ATDC
Crankcase Oil Pressure: 172 kPa – 207 kPa
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