a- tion curves of these fuels are given in figure'l. In spite C02, Na, only a trace of O2, and also CO, Ha, and CH». Some investigators have shown the presence of un- saturated hydrocarbons but tests at this laboratory 700 with fuming sulphuric acid gave no indication of their presence. Figure 2… … Air-fuel ratio Exhaust-gas composition.—The combustion of a Fioube 2.—Composition of exhaust gases from spark- and compression-Ignition hydrocarbon with excess air in an internal-combustion engines using fuels with H-C ratio of 0.175.
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