Design of a Dual Wall Air Gap Exhaust Manifold 980045
The new regulations to reduce emissions have resulted in the development of new techniques to maintain or enhance competitive performance. A requirement for the manifold is to help meet the reduction in cold start emissions, particularly during the transient conditions from start to 100 seconds following the Federal Test Procedures for vehicle emissions. Finite element computer models were developed to predict inner and outer wall temperatures, and to determine structural soundness. Tests were performed to assure that noise levels were minimized. Dynamometer lab and field tests were performed to verify that the manifold would meet the design requirements. From the results of these tests and analyses, modifications were made to the weld and manufacturing techniques to improve product life and reduce noise.
Dual wall manifolds have proven durability to meet high exhaust gas temperatures up to 1650°F (900°C), while meeting the performance, noise, and weight reduction goals.
Citation: Santanam, C., Priebe, D., Scofield, T., and Grable, K., "Design of a Dual Wall Air Gap Exhaust Manifold," SAE Technical Paper 980045, 1998, https://doi.org/10.4271/980045. Download Citation
Author(s):
Chandran Santanam, Dick Priebe, Terry Scofield, Keith Grable
Affiliated:
General Motors Corporation, Benteler Automotive
Pages: 10
Event:
International Congress & Exposition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
General Emissions-SP-1335
Related Topics:
Manifolds
Computer simulation
Test procedures
Noise
Emissions
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