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Fig. 8. Flame pictures of combustion in cylinder four of Cadillac window engine during after-running; engine speed 260 rpm; throttle partially open; ignition spark cut off; compression ratio 5:1; 60-octane secondary reference fuel; intake at top and exhaust at bottom of each picture; 18 successive frames taken at rate of 1140 frames per second.
to obtain photographs of consecutive explosions as they occurred in the engine. Therefore it was not possible to use the high-speed camera principles as outlined by Wedmore and used in the previous window engine since the old engine camera was capable of taking pictures of only one explosion. The ERPI high-speed camera was used. In this camera the field lens focuses the image on the continuously moving 16mm film. Between the lens and the film a glass plate, or two-sided prism, is rotated in such a way that the image is made to move with film. In order to assure complete synchronization of the film and the image, a single motor is used to drive both the film and the prism. A complete discussion of the operation of this camera may be found in the literature.5
Eastman Kodak Super XX film and its standard developing procedure were used. Speeds were about 1150 frame/
sec and engine speeds were approximately 260 rpm. The engine ignition system was shut off. Photographs were taken of two adjoining combustion chambers simultaneously with no effort being made to determine the crankshaft angular position for each photograph. Figure 8 is an example of the photographs obtained for one explosion in one of the combustion chambers. This investigation revealed the important fact that "after-running" was not due to hot spots in the combustion chamber since consecutive explosions showed that combustion was never initiated at the same point in the combustion chamber in any two explosions. The exact mechanism of this phenomenon is still not known.
The investigation of autoignition (ignition by means other than the spark plug discharge) was reopened in 1943. At that time interest in the problem was quite high because of a general occur
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December 1952 Journal of the SMPTE Vol. 59