SPARK PLUG GAPS
High efficiency engines are critical of spark plug adjustment. Under compression the gas in a high compression engine is denser than in a low compression engine, consequently there is a greater resistance to the passage of the spark between the points. Therefore, gap settings on high compression engines are critical and must conform to manufacturer’s instructions. Since the completeness of depends upon the heat of the spark, it will be appreciated that a thin, reedy spark produced by too wide a gap setting will result in loss of power and unsteady running at low speeds. A recent test illustrating the effect of correct spark plug gap adjustment is of interest. In a certain make of 8-cylinder car the plug gaps were set at 43 thousandths of an inch. The maximum speed obtainable at this setting was 52 ra.p.h. in top gear. The plug gaps were then closed to the maker’s instructions. ,028 in. and the maximum speed jumped from 52 to 70 m.p.h. in top gear.
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https://paperspast.natlib.govt.nz/newspapers/ESD19361005.2.120.15
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Evening Star, Issue 22461, 5 October 1936, Page 13
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169SPARK PLUG GAPS Evening Star, Issue 22461, 5 October 1936, Page 13
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