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This paper describes the development of a small and inexpensive single cylinder engine test method for studying the influence of experimental fuels, lubricants, and additives on combustion-chamber deposits. The test operates on a minimum of fuel and lubricant, providing samples of deposits that are chemically similar to those from full-scale engines. These samples are then carefully examined and analyzed to determine the effects of combustion-chamber deposits on engine performance. This test method has proved to be a valuable tool in obtaining a better understanding of the problems associated with combustion-chamber deposits.