A cylinder liner assembly includes an inner wear cylinder, a shell disposed radially outside of an outer surface of the inner wear cylinder, and a central layer disposed between the inner wear cylinder and the shell. The inner wear cylinder is a metal or ceramic, the central layer is a porous material, and the shell is a fiber reinforced polymer. The cylinder liner assembly may include a coolant passage disposed adjacent to the outer surface of the inner wear cylinder, between the inner wear cylinder and the shell. The coolant passage is operable to circulate a coolant therethrough for cooling the inner wear cylinder.

The present invention refers to a cylinder liner for an internal combustion engine, comprising a flange having a seat-engaging surface which is configured for bearing onto a flange seat of an engine block, and wherein the seat-engaging surface has a sloped portion which extends along at least a half of a radial length of the seat-engaging surface and which is inclined relative to a radial plane being normal to a longitudinal axis of the cylinder liner.

A composite thermal barrier and methods of applying the composite thermal barrier to a metallic surface within a combustion chamber of an engine. The composite thermal barrier includes at least one metallic support structure, a metallic skin, and an insulation material. The metallic support structure is connected to a metallic surface within the combustion chamber of the engine. The metallic skin is disposed adjacent to the metallic support structure to define a void space between the metallic skin and the metallic surface. The insulation material is contained within the volume to form the composite thermal barrier.

A steel piston achieving increased thermal brake efficiency in an internal combustion engine is provided. The piston includes a crown presenting a combustion surface, an outer side wall depending from the combustion surface, an outer cooling gallery, and an undercrown cooling gallery. The outer cooling gallery extends circumferentially along the outer side wall beneath the combustion surface. According to one embodiment, the outer cooling gallery is sealed and filled with air, argon, helium, xenon, or carbon dioxide as a cooling media. In this embodiment, the undercrown cooling gallery is filled with air as a cooling media and includes an open inlet hole having a diameter being from 2% to 4% of an outer diameter of the piston. Alternatively, the undercrown cooling gallery is filled with air, argon, helium, xenon, or carbon dioxide as a cooling media, and the inlet hole is sealed.

A cylinder head pallet includes: a base plate; a subplate disposed upwardly of the base plate, spaced apart from the base plate, and having a first surface and a second surface that oppose each other; and a plurality of posts installed on the first surface and the second surface of the subplate to support a cylinder head.

A second dynamic vibration absorber is higher in resonance frequency than a first dynamic vibration absorber. At least one of a ratio of a mass of a body of the first dynamic vibration absorber to a reciprocating inertial mass of the reciprocative rotation mechanism or a ratio of a mass of a body of the second dynamic vibration absorber to the reciprocating inertial mass of the reciprocative rotation mechanism is set such that a peak frequency of antiresonance occurring in a higher frequency region of the first dynamic vibration absorber than the resonance frequency of the first dynamic vibration absorber is substantially different from that of antiresonance occurring in a lower frequency region of the second dynamic vibration absorber than the resonance frequency of the second dynamic vibration absorber.

An engine servicing system includes a motorcycle that has an engine. The engine has a cylinder head, an intake valve and an exhaust valve. A mount is provided and the mount is selectively coupled to the cylinder head. A plurality of bolts is provided and each of the bolts extends through the mount and engages the cylinder head at predetermined points on the cylinder head to retain the mount on the cylinder head. A compression unit is provided and the compression unit is removably coupled to the mount. The compression unit engages each of the intake valve and the exhaust valve such that the compression unit selectively compresses each of the intake valve and the exhaust valve. In this way each of the intake valve and the exhaust valve may be serviced while the engine is mounted in the motorcycle and without removing the cylinder head from the engine.

Provided are a heat-resistant member provided with a heat-shielding coating suitable for stable manufacturing and excellent in heat-insulating, thermoresponsive and distortion accommodating properties, and a method for manufacturing the same. The heat-shielding coating includes a metallic portion formed of agglomerates of a plurality of metal particles, and inorganic compound particles dispersed in the metallic portion. The metal particles are diffusion-bonded each other, and the metallic portion and a base material of the heat-resistant member are diffusion-bonded each other. The manufacturing method includes the steps of depositing mixed particles of the metal particles and the inorganic compound particles on a surface of the base material in a film shape; resistance-heating the mixed particles by current-passing while pressurized in a thickness direction; diffusion-bonding the metal particles each other; and the metallic portion and the base material each other.

Methods of honing a surface are disclosed. The method may include spraying a coating having an initial average bulk porosity onto an engine bore wall and honing the coating to create an intermediate honed surface. The method may then include cleaning the intermediate honed surface and honing the intermediate honed surface with a cutting force of, for example, 110-130 kgf after the cleaning step. This may create a honed surface having an average porosity greater than the initial average bulk porosity. The methods may create a honed surface having a porosity that is more porous than the initially sprayed coating. The increased porosity of the honed surface may allow for increased oil retention in, for example, engine bores.

A first angle portion where part of a bearing cap side wall portion is cut out and a second angle portion where part of a bearing cap bottom surface portion is cut out are formed in a region (an angle region of a bearing cap) including a part where respective extension portions of the bearing cap side wall portion and the bearing cap bottom surface portion intersect each other, and a gap is provided between the crankcase side wall portion of a journal wall and the first angle portion and between a crankcase bottom surface portion and the second angle portion.