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Four pressure transducers were installed into a split-head CFR engine to determine the spatial and temporal location of engine knock. The CFR engine was operated for these experiments using a primary reference fuel of 80% iso-octane and 20% n-heptane (octane number of 80). The compression ratio was varied to obtain different intensities of knock in the acquired data sets. Pressure transducer signals were recorded using a high speed data acquisition system and the resulting traces were analyzed to find where knock was occurring within the combustion chamber. A two dimensional triangulation scheme was developed to locate the knock origin based on the time difference between the acoustic signals detected by the pressure transducers. Limitations in spatial resolution due to digital sampling rate and variations in the speed of sound are discussed.

This paper is a progress report on the conversion of the military L-141 gasoline engine to the Texaco Controlled-Combustion System and the evaluation of naturally aspirated and turbocharged installations in an M-151 vehicle. Relative to the standard gasoline vehicle, significant improvement in fuel economy with low exhaust emission levels were demonstrated as were the multifuel capabilities and excellent cold starting facility of the combustion concept. Possibilities for further improvement in TCCS exhaust quality through adjustment of operating parameters and add-on devices are also presented. This work was done under contract to the U.S. Army Tank-Automotive Command.

The conversion of the Military L-141 gasoline engine to the Texaco Combustion Process to achieve improved fuel economy and multifuel capability is discussed. Under contract to the U. S. Army Tank Automotive Command, the design and fabrication of both single cylinder and multi-cylinder versions of the engine have been carried out. Considerable engine dynamometer testing and preliminary evaluation in an M-151 vehicle has shown that stratified combustion over the required load and speed range, multifuel capability and a significant improvement in fuel economy relative to the standard engine have been attained. Design features of the prototype engine and test results to date are presented.