Abstract
The information on the combustion characteristics of hydrocarbons, preciously reported, leads to aletter insight into the anti-knock performance of hydrocarbons in gasoline engines. The results show that the overall extent of reaction taking place before ignition relates very closely to the knock-limited performance of the fuel. The effects of the addition of tetracthyl lead and hydrocarbon components whose value in terms of blending octane number is not predictable from the intrinsic octane number, can be readily interpreted from their effects on the extent of pre-flame reactions. Furthermore, the performance changes brought about by alterations in engine speed or operating temperature are shown to be governed by the changes in the resistance to ignition (as judged by the ignition temperature by relationship and also by the influence of mixture strength on this) and with the changes occurring in the extent of pre-flame reaction.
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