Abstract
A mechanical test rig and a single-cylinder test engine have teen used to study the influence of lubricants, materials, and surface finish, in relation to scuffing failure of piston rings and cylinder bores. Good correlation between the mechanical rig and the engine was demonstrated when scuffing performance in the two devices was rated in terms of a factor involving contact pressure and sliding velocity. With the many features investigated, a wide range of results was obtained, and the work has thereby brought attention to various modifications which can be made in order to alleviate problems of scuffing which can occur particularly during engine “break-in”.

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