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Friction Reduction by Piston Ring Pack Modifications of a Lean-Burn 4-Stroke Natural Gas Engine: Experimental Results

[+] Author Affiliations
Kris Quillen, Rudolf H. Stanglmaier

Colorado State University, Fort Collins, CO

Luke Moughon, Rosalind Takata, Victor Wong

Massachusetts Institute of Technology, Cambridge, MA

Ed Reinbold, Rick Donahue

Waukesha Engine Dresser

Paper No. ICES2006-1327, pp. 683-692; 10 pages
  • ASME 2006 Internal Combustion Engine Division Spring Technical Conference
  • ASME 2006 Internal Combustion Engine Division Spring Technical Conference (ICES2006)
  • Aachen, Germany, May 7–10, 2006
  • Conference Sponsors: Internal Combustion Engine Division
  • ISBN: 0-7918-4206-1 | eISBN: 0-7918-3775-0
  • Copyright © 2006 by ASME


A project to reduce frictional losses from natural gas engines is currently being carried out by a collaborative team from Waukesha Engine Dresser, Massachusetts Institute of Technology (MIT) and Colorado State University (CSU). This project is part of the Advanced Reciprocating Engine System (ARES) program led by the US Department of Energy. Previous papers have discussed the computational tools used to evaluate piston-ring/cylinder friction and described the effects of changing various ring pack parameters on engine friction. These computational tools were used to optimize the ring pack of a Waukesha VGF 18-liter engine, and this paper presents the experimental results obtained on the engine test bed. Measured reductions in friction mean effective pressure (FMEP) were observed with a low tension oil control ring (LTOCR) and a skewed barrel top ring (SBTR). A negative twist second ring (NTSR) was used to counteract the oil consumption increase due to the LTOCR. The LTOCR and SBTR each resulted in a ∼ 0.50% improvement in mechanical efficiency (ηmech ).

Copyright © 2006 by ASME



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