Spark-timing control based on correlation of maximum-economy spark timing, flame-front travel, and cylinder-pressure rise

Cook, Harvey A Heinicke, Orville H Haynie, William H
naca-report-886
1947


An investigation was conducted on a full-scale air-cooled cylinder in order to establish an effective means of maintaining maximum-economy spark timing with varying engine operating conditions. Variable fuel-air-ratio runs were conducted in which relations were determined between the spark travel, and cylinder-pressure rise. An instrument for controlling spark timing was developed that automatically maintained maximum-economy spark timing with varying engine operating conditions. The instrument also indicated the occurrence of preignition.

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http://naca.central.cranfield.ac.uk/reports/1947/naca-report-886.pdf