The Koehler K90901 Combination Octane Rating Unit Engine is a high-performance, fully integrated system designed to determine the Research Octane Number (RON) and Motor Octane Number (MON) of liquid spark-ignition engine fuels, including ethanol-blended fuels up to 25% v/v. Conforming to ASTM D2699, ASTM D2700, ISO 5163, ISO 5164, IP 236, and IP 237, this advanced single-cylinder, four-stroke cycle engine features motor-driven compression ratio adjustment (4:1 to 18:1) and dual-speed motor control for seamless transition between RON (600 rpm) and MON (900 rpm) test conditions. The system offers precise environmental control, including intake air humidity regulation, crankcase oil heating, and exact coolant and air temperature maintenance. Key components include a four-bowl falling level carburetor, digital ignition timing display, knock signal conditioning module, and a comprehensive safety system with auto-shutdown and fault indicators. The user-friendly control panel provides intuitive access to operational settings, real-time test data, and barometric pressure compensation. Designed for long service life and consistent accuracy, the K90901 is ideal for fuel labs and refineries needing reliable octane number evaluation up to 120 ON, while simplifying operations through auto-set features and digital data display.
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