Combination Octane Rating Unit Engine

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Combination Octane Rating Unit Engine

Koehler Octane Rating Unit 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.

Through the engine's operating panel, the parameters are adjustable according to the ASTM D2699 and D2700 specifications. The professional and clear design of the operating area makes the octane rating operation convenient and the data is easy to read and record. The auto-setting function of the octane engine effectively simplifies operational procedures and improves the efficiency of octane testing. The operating panel is equipped with a protect system and push-button switches to avoid improper operation. 

Koehler Combination Octane Rating Unit Engine
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K90901 - Combination Octane Rating Unit Engine (Operational Video)

Smart Advanced Features

  • Conforms to the specifications of ASTM D2699 & D2700.
  • Easy conversion between MON and RON methods is accomplished by use of the dual speed motor, with no need to change the flywheel.
  • The dual speed motor with slide base steadily provides constant octane engine speeds as per ASTM D2699 and D2700 methods during operation.
  • The compression ratio and ignition timing are displayed directly on the operating panel, and it displays the compensated reading for barometric pressure.
  • Through the engine's safety system, the engine auto-stops with various fault indications.

Specifications

Conforms to the specifications of: ASTM D2699 and ASTM D2700

Working Range: Up to 120 Octane Number

Operation Conditions:

Cylinder Jacket Coolant Temperature: 100 °C ± 1.5 °C (212 °F ± 3 °F)
Crankcase Oil Temperature: 57 °C ± 8.5 °C (135 °F  ± 15 °F)

MON Conditions: 

Engine Speed: 900 ± 9 rpm
Ignition Timing: Variable as cylinder height is changed
Intake Air Temperature: 38 °C ± 1 °C (100 °F ±  5 °F)
Intake Mixture Temperature: 149 °C ± 1 °C (300 °F  ± 2 °F)

RON Conditions: 

Engine Speed: 600 ± 6 rpm
Ignition Timing: 13° BTDC
Intake Air Temperature: 52 °C ± 1 °C (125 °F  ± 2 °F)

Engine Information:

Compression Ratio (C.R.): 4:1 - 18:1
Cylinder Bore (diameter): 82.55 mm (3.250")
Stroke: 114.30 mm (4.50")
Carburetor Venturi (Research): 14.30 mm (9/16")
Intake Valve Clearance (Hot): 0.20 mm ± 0.025 mm (0.008" ± 0.001")
Exhaust Valve Clearance: 0.20 mm ± 0.025 mm (0.008"  ± 0.001")
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 (25 psi to 30 psi)

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