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The cylinder liner of an internal combustion engine includes a wet-type
upper portion and a dry-type lower portion. The upper (wet) portion of
the cylinder liner is formed to include alternate thinner and thicker
portions, the thicker portions strengthening the liner in the wet area
and enabling the overall thickness of this portion of the liner to be
smaller than would otherwise be possible. Further, the shapes involved
by this construction provide a plurality of parallel annular flow
passages by which the cooling fluid is directed in parallel paths
around the upper portion of each of the cylinders from one side of each
cylinder to the other side thereof. |