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.
The Effects of Crevices on the Engine-Out Hydrocarbon Emissions in SI Engines
Sae Technical Papers
International Congress & Exposition ; 1994
1994-03-01
Conference paper
English
The effects of crevices on the engine-out hydrocarbon emissions in SI engines
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