| 摘要 |
The design and construction of past exhaust port liners with heat insulation capabilities have become more complicated and costly or have incurred increased associated costs for utilizing the invention. The present invention overcomes these problems by utilizing a simple exhaust port liner and seal assembly for an internal combustion engine. The exhaust port liner and seal assembly includes a member which has a flange and a body extending from the flange. The flange is mounted between a cylinder head and an exhaust manifold and the body extends into an exhaust port. The member terminates at an annular lip in close proximity to a cylindrical wall of the exhaust port to form an enclosed space between the lip and the flange. A sealing means surrounds the flange between the cylinder head and the exhaust manifold to seal exhaust gas within the exhaust port before entering the exhaust manifold. The enclosed space allows an air layer to form between the body of the member and the cylinder head to act as an insulating medium. The insulating air layer in conjunction with the limited physical contact between the member and the cylinder head decreases the rate of heat loss from the exhaust gas. The ability to decrease the rate of heat loss increases engine efficiency. |
