Abstract
Road antiknock properties and CFR octane ratings were tested by means of some typical domestic cars on about eighty gasoline samples. The gasolines were selected at random from market products in Japan and from the author's laboratory trial products.While a majority of the samples were found to have road octane numbers fairly comparable to their CFR research octane numbers, there exists a group of gasolines which depreciate considerably in road performance. The gasoline in this group exhibits a common characteristics that the road octane number is appreciably lower than the research octane number at low engine speed, but it rises as the engine speed increases up to the level quite near its research octane number.By investigating the type of these samples, it was recognized that the gasoline showing irregular correlations between CFR and road octane number is rich in aromatic constituents.The improvement of road performance of the aromatic-rich gasoline at higher engine speed can be regarded as a compound result of the chemical type of the component and the fuel vaporization mechanism in the course of the full throttle acceleration at the measurement of road octane number.This report gives experimental data on the aspects of performances of gasolines being marketed in Japan, followed by some discussions.
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