What is the Road Octane requirement of an vehicle?
The actual octane requirements of a vehicle is called the Octane Number Requirement ( ONR ), and is determined by using standard octane fuels that can be blends of iso-octane and normal heptane, or commercial gasolines. The vehicle is tested under a wide range of conditions and loads, using different octane fuels until trace knock is detected. The conditions that require maximum octane are not consistent, but often are full-throttle acceleration from low starting speeds using the highest gear available. They can even be at constant speed conditions [17]. Engine management systems that adjust the octane requirement may also reduce the power output on low octane fuel, resulting in increased fuel consumption. The maximum ONR is of most interest, as that usually defines the recommended fuel. The octane rating engines do not reflect actual conditions in a vehicle, consequently there are standard procedures for evaluating the performance of the gasoline in an engine. The most common are:- 1.
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- What is the Octane Number Requirement of a Vehicle?
- What is the Road Octane requirement of an vehicle?
