1990-02-01

An Investigation into the Production of Hydrocarbon Emissions from a Gasoline Engine Tested on Chemically Defined Fuels 900354

Gaseous emissions were sampled from the exhaust of a single cylinder version of a modern four-valve homogeneous charge spark-ignition engine. The hydrocarbon emissions were extensively analysed using capillary gas chromatography. Levels of key components of the hydrocarbons including methane, benzene and 1, 3-butadiene, were related to fuel composition, mixture strength and exhaust gas recirculation rate. It was shown that the relative levels of hydrocarbon emissions could generally be explained from a knowledge of chemical mechanisms. The significance of the observed trends for the development of engines with reduced levels of hydrocarbon emissions is considered.

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