Features

• 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 engine crankcase is designed with high strength and rigidity for various fuel types to ensure long service life and carefree operation
• The cylinder assembly allows the compression ratio to be changed by adjusting the cylinder height, which is adjusted by the electric motor assembly
• The dial indicator is installed on the octane engine for direct reference to the cylinder height
• The compression ratio and ignition timing are displayed directly on the operating panel, and it displays the compensated reading for barometric pressure
• With digital knock signal adjustment, combustion knock is converted into a stable and accurate analog signal to improve accuracy and efficiency
• Through the engine's safety system, the engine auto-stops with various fault indications
• With the exhaust surge tank system, the engine eliminates resonance pulses and back pressure for more consistent and accurate results
• The intake air humidity equipment regulates the moisture content of the intake air as per the ASTM specifications

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)