Researchers at General Motors have studied the effect of combustion products of ten engine oils blended with different additives on both catalyst and oxygen sensor performance of production versions of GM's Computer Controlled Catalyst Converter (C-4) emission system. Catalyst HC conversion efficiency decreased with increased amounts of zinc dialkyldithiophosphate (ZDP) in the lubricating oil and with increased phosphorus found on the catalyst. Alkaline metal additives in the oil reduced the amount of ZDP-derived phosphorus retained by the catalyst and reduced the deleterious effect of phosphorus on HC conversion efficiency, but had no effect on the reduction in CO-NOx crossover efficiency,. Alkaline metal additives had no effect on sensor performance. Oxygen sensor output voltage and rich-to-lean response time increased as phosphorus accumulated on the sensor but its lean-to-rich response time was unaffected.

Media Info

  • Pagination: p. 31-35
  • Serial:
    • Automotive Engineering
    • Volume: 87
    • Issue Number: 11
    • Publisher: Society of Automotive Engineers (SAE)
    • ISSN: 0098-2571

Subject/Index Terms

Filing Info

  • Accession Number: 00325063
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: May 21 1981 12:00AM