for Measuring Antiknock Quality
THIS paper explains the temperature-density concept used to measure the antiknock quality of fuels. In this method a laboratory engine is operated at constant fuel-air ratio and peak power spark, with manifold air pressure being used to stress fuels into the knocking zone.
According to the author, the data obtained can be analyzed to give a single curve or formula expressing antiknock quality or preignition resistance at any combination of compression ratio, inlet temperature, and manifold pressure.
The paper summarizes 14 practical applications, including suggestions for new control and auxiliary test methods for studying knock and autoignition behavior on a much broader basis than is possible with ASTM methods.