Knock Ratings of Pure Hydrocarbons

Detonation Characteristics of Some Aliphatic Olefin Hydrocarbons

“…It was pointed out long ago (7) that olefin hydrocarbons differ from the paraffins in their tendency to knock. Data have been published (1,2,8) on the knock characteristics of several isolated aliphatic olefins of definite structure-namely, 2-pentene, trimethylethylene, and diisobutylene-and as might be expected from analogy with the paraffin hydrocarbons, there appears considerable difference between the two isomeric pentenes upon which data are available.…”

“…The possible number of olefin hydrocarbons, however, is 5, 13, 27, and 68, respectively. Of the 68 possible octenes, only 8 have been previously reported in the literature as having been prepared in a state approaching purity.…”

Knocking Characteristics of Hydrocarbons

“…The straight-chain paraffin hydrocarbon n-heptane was very prone to knock, while the branched-chain iso-octane was comparatively free from knock, and it was thus apparent that different isomeric heptanes an octanes would have greatly differing tendencies to knock. In 1929 Birch and Stansfield (3) and Nash and Howes (IS,16,32) published data on the knock rating of solutions in gasoline of several different hydrocarbons.…”

Knocking Characteristics of Naphthene Hydrocarbons

“…As early as 1921 Ricardo (8) published values for the highest useful compression ratio of cyclohexane and methyl cyclohexane; values of the knocking characteristics of several naphthenes have been published by Nash and Howes (7) and by Birch and Stansfield (1). Recently Hofmann and others (4) published data on cyclohexane, three alkyl cyclohexanes, and cyclohexene, the determinations having been made in 30 per cent solution in gasoline and in terms of compression ratio.…”