Friction and Wear of the Piston Ring - Cylinder Liner System with Artificially Aged Ultra-Low Viscosity Engine Oils

This study aims to investigate the performance of artificially aged prototype engine oils through friction and wear experiments. Experiments were performed on a piston ring - cylinder liner model system with boundary conditions derived from real-life operating conditions. The experimental design implemented two prototype oils (SAE 0W-12 and 0W-16) in unaltered and artificially aged form. An additional fully formulated off-the-shelf engine oil (SAE 0W-20) was also aged and analyzed as reference. Oil samples were artificially aged in a custom rig, to simulate long-term in-engine use through thermal cycling at 180 °C. Fourier Transformed Infrared Spectroscopy of the lubricant samples highlighted a depletion of zinc dialkyl-ditiophosphate antiwear additives in all cases, which is comparable to a selected in-service oil. Oxidation was also measurable, albeit lower compared to the in-service sample. Averaged friction coefficients showed a ranking of aged 0W-12 < aged 0W-16 < unaltered 0W-12 < unaltered 0W-16. A decrease in surface roughness was experienced with aged oil samples, whereas unaltered 0W-16 oil produced an unexpected transition in the wear phenomenon and resulted in severe wear.

• Record URL:
  • https://doi.org/10.3311/PPtr.22918
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/15873811
• Supplemental Notes:
  • © 2024 Budapest University of Technology and Economics. All rights reserved.
• Authors:
  • Nagy, András Lajos
• Publication Date: 2024

Language

• English

Media Info

• Media Type: Web
• Features: Figures; Photos; References; Tables;
• Pagination: pp 190-198
• Serial:
  • Periodica Polytechnica Transportation Engineering
  • Volume: 52
  • Issue Number: 2
  • Publisher: Budapest University of Technology and Economics
  • ISSN: 1587-3811
  • Serial URL: http://www.pp.bme.hu/tr/index
• Publication flags:

  Open Access (libre)

Subject/Index Terms

• TRT Terms: Engine cylinders; Engine oils; Friction; Material aging; Piston rings; Wear
• Subject Areas: Highways; Maintenance and Preservation; Materials; Vehicles and Equipment;

Filing Info

• Accession Number: 01944664
• Record Type: Publication
• Files: TRIS
• Created Date: Jan 31 2025 11:38AM