Patent ID: 6439173
Filing Date: 2002-08-27
Classification: F02F

Abstract:
An internal combustion engine including:an engine block having a head seat surface and a cylinder opening extending from the head seat surface into an interior of the engine block, the cylinder opening having a cylinder opening surface, and a cylinder opening cylindrical wall that is cylindrical about a longitudinally extending cylindrical axis and has a wall upper surface located at a recess depth below the head seat surface, the cylinder opening wall having a cylinder opening inner cylindrical diameter and a cylinder opening outer dimension such that there is a gap between the cylinder opening cylindrical wall and the cylinder opening surface; and a cylinder insert residing within the cylinder opening and having an insert upper surface substantially flush with the head seat surface of the engine block, the cylinder insert comprising a smooth cylindrical inner surface with a longitudinally extending cylindrical axis, and a stepped outer surface formed of three longitudinal regions, the three longitudinal regions including a first longitudinal region adjacent to the insert upper surface and having a first wall thickness, a second longitudinal region remote from the first longitudinal region and having a second wall thickness less than the first wall thickness, the second longitudinal region being received within the inner cylindrical diameter of the cylinder opening wall, and a third longitudinal region intermediate between and continuous with the first longitudinal region and the second longitudinal region, the third longitudinal region having a third wall thickness intermediate between the first wall thickness and the second wall thickness.