Analysis of Single and Multi-Grade Lubricant Film Thickness in a Diesel Engine
Abstract
Several recent experiments have been made to attempt to determine the rheology of the lubricant in journal bearings of engines. A laser fluorescence technique in use at the Massachusetts Institute of Technology allows accurate data collection of the oil film thickness on the ring pack of a production diesel engine. The data collected from the Kubota EA300N IDI engine consisted of five different types of lubricant under the compression ring acts in a Newtonian manner independent of lubricant type or inertial effects. The difference between the types of lubricants appears to be the degree to which oil wets the ring with the single-grade oils wetting the ring more thoroughly than do the multigrades. A consistent linear relationship between the inlet wetting of the ring and the bearing number (a non-dimensional lift term) was found to exist for each stroke. Drag was also found to be inversely proportional to the amount of inlet wetting.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1990
- Accession Number
- ADA226651
Entities
People
- Mark J. Olechowski
Organizations
- Massachusetts Institute of Technology