Thermal barrier cylinder liner insert

A cylinder liner for an internal combustion engine, comprising:

• a liner body extending circumferentially around a center axis and longitudinally from a top end to a bottom end, said liner body having a length extending from said top end to said bottom end,
• said liner body presenting an interior surface facing said center axis,
• an insert body disposed along said interior surface of said liner body,
• said insert body extending circumferentially around said center axis and longitudinally from an upper end to a lower end,
• said insert body extending along a majority of said length of said liner body,
• said insert body including an inner portion presenting an inner surface facing said center axis,
• said inner surface presenting an opening, and said inner surface being exposed for engaging a piston and/or piston ring,
• said insert body including an outer portion presenting an outer surface facing away from said center axis,
• said outer portion being longitudinally aligned with and disposed radially outwardly of said inner portion,
• said outer surface of said outer portion engaging said interior surface of said liner body,
• said inner portion being formed of an iron-based material, and
• said outer portion being formed of a material having a thermal conductivity of not greater than 3.5 W/mK.

A method of manufacturing a cylinder liner for an internal combustion engine, comprising the steps of:

• providing a liner body extending circumferentially around a center axis and longitudinally from a top end to a bottom end, the liner body presenting an interior surface facing the center axis;
• disposing an insert body along the interior surface of the liner body, the insert body extending circumferentially around the center axis and longitudinally from an upper end to a lower end, the insert body including an inner portion presenting an inner surface facing the center axis, the inner surface presenting an opening, the insert body including an outer portion presenting an outer surface facing away from the center axis, the outer portion being longitudinally aligned with and disposed radially outwardly of the inner portion, the outer surface of the outer portion engaging the interior surface of the liner body, the inner portion being formed of an iron-based material, and the outer portion being formed of a material having a thermal conductivity of not greater than 3.5 W/mK;
• and
• wherein the inner portion of the insert body is formed by spraying the iron-based material.