| 摘要 |
An MLS combustion cylinder head gasket includes a relatively thick soft metal stopper having a square nosed aperture edge adapted to face a fla me front in a cylinder head bore. The square nosed edge is designed to eliminate the trapping of hydrocarbons, which creates a major source of emission issues. The soft metal stopper is preferably formed of copper, although other soft metals capable o f withstanding high temperatures may be employed. The stopper is formed of a malleable metal ring, and is formed over and about the edge of a combustion aperture edge of the gasket via a forming die that both shapes and clinches the metal ring respectively about and to the circumferential edge of each combustion aperture. The stopper, applied to the center spacer layer of the gasket, is adapted to flo w into crevices and to thus "conform" to the normally variable spacing between engi ne block and cylinder head.
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