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The Effect of the Exhaust Pipe Arrangement on Motorcycle Engine Acoustics

[+] Author Affiliations
Frank K. T. Lin

Industrial Technology Research Institute, Hsinchu, Taiwan, R.O.C.

Paper No. ESDA2006-95443, pp. 203-210; 8 pages
  • ASME 8th Biennial Conference on Engineering Systems Design and Analysis
  • Volume 2: Automotive Systems, Bioengineering and Biomedical Technology, Fluids Engineering, Maintenance Engineering and Non-Destructive Evaluation, and Nanotechnology
  • Torino, Italy, July 4–7, 2006
  • ISBN: 0-7918-4249-5 | eISBN: 0-7918-3779-3
  • Copyright © 2006 by ASME


This paper uses a commercial CAE software GT-POWER to simulate the V-twin cylinder motorcycle engine exhaust acoustics. Ten different engine exhaust pipes with equal and unequal length and with or without arc connecting tube are designed. The engine performance and tailpipe exhaust noise on nineteen different engine speeds from 1000rpm to 10000rpm in wide-open throttle are studied. It is found that the effect of exhaust pipe configuration on the engine performance appears to be negligible. The tailpipe exhaust flow rate will be reduced and the overall sound level will bring down as the arc tube is connected to the exhaust front pipes. Also, the equal pipe length adapted with arc tube design gives a major function on pressure attenuation which may reduce the noise level significantly. The results may be useful for exhaust pipe design.

Copyright © 2006 by ASME



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