Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel.
Get more information about the standard at ASTM D2699-24a
ASTM D2699 is a widely recognized standard test method for determining the Research Octane Number (RON) of spark-ignition engine fuels, such as gasoline and ethanol blends. The RON is a critical measure of a fuel’s anti-knock properties, indicating its ability to resist detonation or “knocking” during combustion. This standard provides an accurate and repeatable method to evaluate fuel quality and ensure optimal engine performance.
Details
The Research Octane Number (RON) is determined by comparing the knock intensity of a test fuel to that of standard reference fuels under controlled conditions. The method uses a single-cylinder, variable-compression-ratio engine specifically designed for octane testing, known as a CFR (Cooperative Fuel Research) engine. The test is conducted at specific operating conditions, including a fixed engine speed of 600 revolutions per minute (RPM).
Industries and Applications
ASTM D2699 is vital in several industries and applications:
- Automotive industry: Automakers and engine manufacturers use the RON values to design engines optimized for specific fuel types, ensuring performance and durability
- Fuel refineries and blenders: Refiners use this standard to certify that their gasoline meets required octane specifications before distribution. Octane rating is a key quality parameter for fuels sold in the market
- Regulatory agencies: Government bodies mandate compliance with specific octane ratings to meet environmental and performance standards.
- Racing and high-performance engines: High-performance engines require fuels with high RON values to handle higher compression ratios and deliver superior power
- Biofuels: ASTM D2699 is also used to assess the octane performance of ethanol blends and other alternative fuels, ensuring they are suitable for modern engines