Insulating engine exhaust port liner

摘要

An insulating liner for use in an exhaust port of an internal combustion engine or the like consisting, in a preferred embodiment, of a formed thin wall tubular body of rigidized fibrous ceramic such as fibrous alumina-silica material (Fiberfrax) with an abrasion resistant ceramic coating fused onto the inner gas-exposed surface of the body. The coating comprises a mixture of fused silica cement and fine glass frit sintered in place on the body inner surface at a temperature below that which would damage the thin walls of the body.