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Combustion Efficiency and Sound Attenuation as Affected by Muffler Design
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English
Abstract
This paper identifies some of the environmental issues associated with sound attenuation of exhaust notes generated by internal combustion racing engines. It points to how sound abatement relates to overall engine combustion efficiency or power.
Historically, there has not been widespread concern about environmental impact of unabated exhaust noise produced in various forms of motorsports. Today, this is changing. In the interest of maintaining acceptable levels of power from muffled racing engines, a technology is emerging that focuses on the relationships between combustion efficiency and exhaust noise reduction.
Through the combined use of engine cycle analysis (ECA) and spectrum analysis, this paper discusses how these two areas of data acquisition and their application are leading to a reduction in the potential damage to human hearing, not to the significant detriment of race car performance.
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Citation
Flugger, R. and McFarland, J., "Combustion Efficiency and Sound Attenuation as Affected by Muffler Design," SAE Technical Paper 942543, 1994, https://doi.org/10.4271/942543.Also In
References
- The Internal Combustion Engine in Theory & Practice Taylor Charles F. 2 MIT Press 1977
- Internal Combustion Engines & Air Pollution Obert Edward F. Harper & Rowe Publishers, Inc. 1973
- Elements of Internal Combustion Engines Rowgowski A.R. McGraw-Hill Book Company 1953
- SuperFlow Corporation published instructional materials 1990