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42 Catalytic Reduction of Marine Sterndrive Engine Emissions
Technical Paper
2002-32-1811
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English
Abstract
A 2001 General Motors 4.3 liter V-6 marine engine was baseline emissions tested and then equipped with catalysts. Emission reduction effects of exhaust gas recirculation (EGR) were also explored. Because of a U.S. Coast Guard requirement that inboard engine surface temperatures be kept below 200°F, the engine's exhaust system, including the catalysts, was water-cooled.
Engine emissions were measured using the ISO-8178-E4 5-mode steady-state test for recreational marine engines. In baseline configuration, the engine produced 16.6 g HC+NOx/kW-hr, and 111 g CO/kW-hr. In closed-loop control with catalysts, HC+NOx emissions were reduced by 75 percent to 4.1 g/kW-hr, and CO emissions were reduced by 36 percent to 70 g/kW-hr of CO.
The catalyzed engine was then installed in a Sea Ray 190 boat, and tested for water reversion on both fresh and salt water using National Marine Manufacturers Association procedures. Engine and emission control system performance were verified after on-water operation, and confirmed to be operating satisfactorily.
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Citation
White, J., Carroll, J., and Samulski, M., "42 Catalytic Reduction of Marine Sterndrive Engine Emissions," SAE Technical Paper 2002-32-1811, 2002.Also In
References
- Code of Federal Regulations “Control of Emissions from Marine Spark-Ignition Engines.”
- California Code of Regulations “Emission Standards and Test Procedures for New 2003 and Later Spark-ignition Inboard and Sterndrive Marine Engines,” July 2001 California Air Resources Board
- Carroll, J.N. “Marine Gasoline Engine and Boat Testing,” Environmental Protection Agency June 2002
- Sims, G.S. Johri, S. “Catalyst Performance Study Using Taguchi Methods,” SAE Technical Paper 881589 General Motors Corporation 1988