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Engine Friction Reduction Through Liner Rotation  

Joo Shinhyuk (Department of Mechanical Engineering, University of Texas at Austin)
Kim Myungjin (Department of Mechanical Engineering, University of Texas at Austin)
Matthews Ronald D. (Department of Mechanical Engineering, University of Texas at Austin)
Chun Kwang-Min (Department of Mechanical Engineering, Yonsei University)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.14, no.1, 2006 , pp. 31-38 More about this Journal
Abstract
Cylinder liner rotation is a new concept for reducing piston assembly friction in the internal combustion engine. The purpose of cylinder liner rotation is to reduce the occurrence of boundary and mixed lubrication friction in the piston assembly. This paper reports the results of experiments to quantify the potential of the rotating liner engine. A GM Quad-4 SI engine was converted to single cylinder operation and modified for cylinder liner rotation. The hot motoring method was used to compare the friction loss between the baseline engine and the rotating liner engine. Additionally, tear-down tests were used to measure the contribution of each engine component to the total friction torque. The cycle-averaged motoring torque of the RLE represents a $23\~31\%$ friction reduction compared to the baseline engine for hot motoring tests. Through tear down tests, it was found that the piston assembly friction of the baseline engine is reduced from $90\%$ at 1200 rpm to $71\%$ at 2000 rpm through liner rotation.
Keywords
Rotating liner engine; Engine friction; Liner rotation; Friction reduction; Engine lubrication;
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