FACTORS CONTRIBUTING TO THE FORMATION OF DEPOSITS ON THE INLET VALVES OF INTERNAL COMBUSTION ENGINES

The requirements of low fuel consumption, low emissions, and low production cost have caused problems with coke deposits in reciprocating-piston internal combustion engines for motor vehicles. In order to investigate the deposition processes, the author determined the influence of engine parameters such a the oil volume at the valve shaft, crankcase ventilation, internal exhaust recirculation, valve temperature and mixture preparation under constant boundary conditions (especially fuel and lube oil composition) on a test bench. After outlining the state of knowledge on deposition formation conditions, the author explains the experimental programme and presents some results. A reproducible method of forming deposition, the growth with time of deposits, the influence of lube oil consumption, the mixing system, valve temperatures, the influence of the air ratio, morphology, deposit formation, and surface influences are gone into.

• Corporate Authors:

  Technical University of Aachen, Germany

  Templergraben 55
  D-5100 Aachen, ID  Germany  83401
• Authors:
  • Schommers, J
• Publication Date: 1986-7-8

Language

• German

Media Info

• Pagination: 123 p.

Subject/Index Terms

• TRT Terms: Carbon; Coke; Deposits (Geology); Internal combustion engines; Machine valves
• Uncontrolled Terms: Causes
• Old TRIS Terms: Deposits
• Subject Areas: Geotechnology; Highways; Vehicles and Equipment;

Filing Info

• Accession Number: 00482687
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: NP-8770328
• Files: TRIS
• Created Date: Apr 30 1989 12:00AM