The Effects of Crevices on the Engine-Out Hydrocarbon Emissions in SI Engines
Date Published: 1994-03-01
Paper Number:940306
DOI: 10.4271/940306
Citation:
Min, K., Cheng, W., and Heywood, J., "The Effects of Crevices on the Engine-Out Hydrocarbon Emissions in SI Engines," SAE Technical Paper 940306, 1994, doi:10.4271/940306.
Author(s):
Kyoungdoug Min - Massachusetts Institute of Technology
Wai K. Cheng - Massachusetts Institute of Technology
John B. Heywood - Massachusetts Institute of Technology
Abstract:
To understand the effects of crevices on the engine-out hydrocarbon emissions, a series of engine experiments was carried out with different piston crevice volumes and with simulated head gasket crevices. The engine-out HC level was found to be modestly sensitive to the piston crevice size in both the warmed-up and the cold engines, but more sensitive to the crevice volume in the head gasket region. A substantial decrease in HC in the cold-to-warm-up engine transition was observed and is attributed mostly to the change in port oxidation.
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