Word: knockless
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Dates: during 1940-1949
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...Rating is determined by feeding the gasoline to be tested to a test motor, whose spark is advanced until knocking appears. An identical motor is then run on various mixtures of 1) heptane (a bad knocker) and 2) isooctane (once thought to be the perfect knockless fuel) until its knocking corresponds to that of the other. If the unrated gasoline knocks at the same point as a mixture of 30% heptane and 70% isooctane, it is rated as "70 octane...
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