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Flextube™ Catalyst Performance In 4-Stroke Motorcycle Exhaust Systems
Technical Paper
2001-01-1823
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
An analysis of 4-stroke motorcycle emission systems indicates that a heat tube has the potential for meeting the regulatory standards if the location in the exhaust pipe matches the specific operating temperature requirements of the device. The location of a heat tube is determined by the diameter and shape of the exhaust pipe. Since the exhaust flowrate and temperature across the catalytic device determine its effectiveness, it is suggested that a flexible catalyzed tube, which could be placed anywhere in the exhaust, would have a greater potential than a rigid heat tube for solving a wide range of emission application needs. To maximize the benefit from such a simple, cost-effective device, application of the “flex-tube catalyst” was studied over a wide range of conditions.
A test matrix that used high and low levels of Pt/Rh ratio and tube diameter was used to study “flex-tube catalyst” performance in 4-stroke motorcycle exhaust systems. Engine variables include inlet temperature, AFR, exhaust flow and backpressure. Catalyst variables that were probed included tube diameter, precious metal ratio, and rigid or Flextube™ design. Data will be presented to show the benefits of such a device in various configurations. Performance is assessed by comparing the conversion of pollutants at various temperatures and flowrates.
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Citation
Larkin, M., Dettling, J., and Galligan, M., "Flextube™ Catalyst Performance In 4-Stroke Motorcycle Exhaust Systems," SAE Technical Paper 2001-01-1823, 2001, https://doi.org/10.4271/2001-01-1823.Also In
References
- AECC (Association for Emission Control by Catalyst) “Overview of Global Emission Standards for Two- and Three-Wheeled Vehicles” Brussels, Belgium 9 November 2000
- Dettling J.C Galligan M. Larkin M. Adomaitis J. “Emission Control Strategies for 2- and 4-Stroke Motorcycles in India” SAE 2000-01-0002
- Hwang H.S. Dettling J.C. Mooney J.J. “Catalytic Converter Development for Motorcycle Emission Control” SETC '97 SAE 972143