Combination Octane Rating Unit Engine K90901 Koehler

Combination Octane Rating Unit Engine K90901 Koehler

Koehler K90901 Combination Octane Rating Unit Engine

Key Features

• Dual Speed Motor: Enables easy conversion between MON and RON methods without changing the flywheel.  
• Accurate Speed Control: Maintains constant engine speeds as per ASTM D2699 and ASTM D2700 methods.  
• Durable Engine Crankcase: Designed for long service life and reliable operation with various fuel types.  
• Variable Compression Ratio: Adjusts compression ratio by changing cylinder height for precise testing.  
• Easy-to-Read Display: Displays compression ratio, ignition timing, and compensated reading for barometric pressure.  
• Knock Signal Adjustment: Converts combustion knock into an accurate analog signal for improved results.
• Safety Features: Auto-stops engine with fault indications and includes an exhaust surge tank system for consistent results.  
• Intake Air Humidity Control: Regulates moisture content in intake air to meet ASTM specifications.  

Specifications

• Standards Compliance: ASTM D2699, ASTM D2700, ISO 5163, ISO 5164, IP 236, IP 237  
• Working Range: Up to 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 (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  
  • 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 (25 psi to 30 psi)  
• Functional Information:
  • Compression Ratio Adjustment: Motor-driven
  • Compression Ratio Display Device: Dial Indicator & Digital Counter
  • Engine Speed Conversion: Dual-Speed Monitor  
  • Carburetor: Four-Bowl Falling Level (with a cooling function)  
  • Ignition Timing Display: Digital (Auto-set)
  • Crankcase Pressure Display: Yes
  • Crankcase Oil Heater: Yes
  • Oil Temperature Display: Yes
  • Air Humidity Control Apparatus: Yes
  • Unit Protection Systems: Yes  
• Dimensions: lxwxh,in.(cm): 68x42x58 (172.72×106.68×147.32)
• Net Weight: 2250 lbs (1022 kg)