The Effects of Head Gasket Geometry on Engine-Out HC Emissions from S.I. Engines

Paper #:
  • 1999-01-3580

Published:
  • 1999-10-25
Citation:
Alkidas, A., "The Effects of Head Gasket Geometry on Engine-Out HC Emissions from S.I. Engines," SAE Technical Paper 1999-01-3580, 1999, https://doi.org/10.4271/1999-01-3580.
Author(s):
Affiliated:
Pages:
15
Abstract:
This study evaluated multi-layer steel and composite head gaskets of various thicknesses (0.43 to 1.5 mm) and fire-ring diameters to determine the influence of head gasket crevices on engine-out hydrocarbon (HC) emissions. The upper limit in the percent reduction in HC emissions from gasket-design modifications is estimated to be about 15%. At part-load conditions, the lowest HC emissions were measured for head-gasket thickness of about 1 mm. Significantly smaller thicknesses of the order of 0.4 mm result in an increase in HC emissions. Substantial hydrocarbon-emissions advantage may be realized by minimizing the gasket-to-cylinder bore offset.
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