Offset journal bearings are an attractive design option for cross-head and piston bearings for two-stroke engines. Two-stroke engine design has seen a resurgence in the last few years due to potential gains in engine efficiency over their four-stroke counterparts. The cross-head and piston bearings comprising such engines, however, are characterized by non-reversing loads with limited oscillating journal motion, the combination of which provides poor bearing performance for conventional cylindrical bearings. The division of bearing journal and sleeve into offset segments allows for periodic load relaxation in the segments and development of squeeze-film action which substantially improves bearing performance. Offset bearings have been in production for the past 60 years, but there are no general design guidelines available to the engine analyst. This thesis provides predictions of the primary bearing performance factors, cyclic-minimum film thickness and cyclic-maximum film pressure, over a wide range of design parameters found in production-level, two-stroke engines.

Library of Congress Subject Headings

Journal bearings--Design and construction; Two-stroke cycle engines--Parts

Publication Date


Document Type


Student Type


Degree Name

Mechanical Engineering (MS)

Department, Program, or Center

Mechanical Engineering (KGCOE)


Stephen Boedo

Advisor/Committee Member

Hany Ghoneim

Advisor/Committee Member

Jason Kolodziej


Physical copy available from RIT's Wallace Library at TJ1063 .A64 2015


RIT – Main Campus

Plan Codes