Keywords 

Diesel Engine Deposits, Oil & Deposit Analysis, Oxidation Resistance of Base Stocks, Deposit Formation Mechanism

Deposit Formation from Lubricant Degradation - A Deposition Model: Part 1

Engine lubrication systems are designed to deliver clean oil to every part of the engine. A continuing problem is engine deposits. How lacquer and carbon deposits occur has been a continuing research challenge as lubricant quality and engine oil performance requirements increase. Due to limitations of current models a uniform layer model was developed to address both deposit initiation, growth and aging. This model hypothesizes that the physical & chemical transformtions in the deposit occur homogeneously as a function of time, driven by temperature. Part 1 describes use & justification for specific bench tests to produce deposits to simulate those from 1N engine tests. The presentation focuses on the formation of deposits of basestocks with & without additives. The Penn State Tubing Bomb test & Thin-film micro-oxidation test are used to follow lubricant degradation

Authors and Company/Institution

Joseph M. Perez, Dept. of Chemical Engineering, Pennsylvania State University, University Park, PA
Sylvain-Didier Kouame, Southwest Research Institute, San Antonio, TX
Randy Vander Wal, Dept. of Energy and Mineral Engineering, Pennsylvania State University, University Park, PA