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Wave-Stopper® Technology and Fluid Metal Beads



Dana's proprietary Wave-Stopper® sealing technology exhibits both plastic and elastic characteristics, making it ideal for sealing applications such as cylinder-head gaskets. This technology includes topography, creating a highly uniform seal. In areas where significant force is applied around the bolts, the waves compress more than in areas subjected to less force. Additional topography can be applied based on engine structure. Highly uniform loading reduces oil consumption, bore distortion, and overhead cam distortion. The Wave-Stopper layer, when in the compressed state, forms concentric sealing rings. These sealing rings provide additional micro-sealing at the combustion chamber.

Dana has reinvented Semi-Stopper technology to meet the increased sealing requirements of today's cylinder-head gasket joints. With Semi-Stopper, a shim of optimized thickness is placed between the full beads of the active layers at the combustion seal to ensure their full compression. This enables the multi-layer steel (MLS) head gasket to maintain a proper seal even for applications with extremely high combustion pressures. The Semi-Stopper is also well suited for applications with narrow sealing lands since it requires less space compared to other stopper type designs.

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Cylinder Head Gaskets