NOISE REDUCTION RETROFIT FOR A "NEW LOOK" GMC TRANSIT BUS: SERVICE BULLETIN

This document gives instructions on how to apply a noise treatment to a contemporary city transit bus without extensive structural alteration. Prototype anti-noise treatments of two conventional transit motorbuses were tested: a Flexible "New Look" and a GMC "New Look" Model. Baseline bus configuration, noise ratings, and performance benchmarks are presented for a GMC model T8H-5307A transit bus, powered by a Detroit Diesel 8V-71N engine. Earlier, a Flxible model 111DC-D061 was similarly treated using the same concepts and much of the same hardware. The results are almost identical, showing the wide range of treatment applicability. This report gives instructions as to how GMC "New Look" model is retrofitted with a turbocharged 8V-71TAC engine and ancillary hardware. The instructions include the revision of the engine aspiration system for easier breathing, the lining of the engine compartment with an anti-noise blanket, and the silencing of the hiss of the compressed air system dryer.

• Supplemental Notes:
  • Sponsored in part by Environmental Protection Agency, Washington, DC. Office of Noise Abatement and Control. See also PB80-226103.
• Corporate Authors:

  Tri-County Metropolitan Transportation District of Oregon

  4012 Southeast 17th Avenue
  Portland, OR  United States  97202

  Urban Mass Transportation Administration

  Office of Tech Development & Deployment, 400 7th Street, SW
  Washington, DC  United States  20590

  Environmental Protection Agency

  Office of Noise Abatement and Control, 1921 Jeff Davis Hwy
  Arlington, VA  United States  20460
• Authors:
  • Kaye, M C
• Publication Date: 1981-11

Media Info

• Pagination: 64 p.

Subject/Index Terms

• TRT Terms: Air pollution; Buses; Compressed air; Cost estimating; Diesel engines; Estimates; Exhaust gases; Fuel consumption; New products; Noise; Noise control; Retrofitting; Turbochargers; Urban transportation; Vehicle design
• Uncontrolled Terms: Noise reduction
• Old TRIS Terms: Bus design; New look buses; Turbocharging
• Subject Areas: Design; Energy; Environment; Highways; Maintenance and Preservation; Planning and Forecasting; Public Transportation; Vehicles and Equipment; I72: Traffic and Transport Planning;

Filing Info

• Accession Number: 00365694
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: UMTA-OR-06-0005-81-1Final Rpt.
• Contract Numbers: UMTA-OR-06-0005
• Files: NTIS, TRIS, USDOT
• Created Date: Dec 30 1983 12:00AM