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  2. Head gasket - Wikipedia

    en.wikipedia.org/wiki/Head_gasket

    Head gasket (in dark gray with a red border) sitting on top of an inline-four engine block. When installed, the four large holes will align with the cylinders. In an internal combustion engine, a head gasket provides the seal between the engine block and cylinder head (s). Its purpose is to seal the combustion gases within the cylinders and to ...

  3. Induction sealing - Wikipedia

    en.wikipedia.org/wiki/Induction_sealing

    Induction sealing is the process of bonding thermoplastic materials by induction heating. This involves controlled heating an electrically conducting object (usually aluminum foil) by electromagnetic induction, through heat generated in the object by eddy currents. Induction sealing is used in many types of manufacturing.

  4. Sleeve valve - Wikipedia

    en.wikipedia.org/wiki/Sleeve_valve

    The sleeve valve is a type of valve mechanism for piston engines, distinct from the usual poppet valve. Sleeve valve engines saw use in a number of pre– World War II luxury cars and in the United States in the Willys-Knight car and light truck. They subsequently fell from use due to advances in poppet-valve technology, including sodium ...

  5. W. R. Grace and Company - Wikipedia

    en.wikipedia.org/wiki/W._R._Grace_and_Company

    W. R. Grace & Co. 13 spoke 15"x8.5" aluminum wheel, OEM, 1978 Chevrolet K5 Blazer Cheyenne. W. R. Grace and Co. is an American chemical business based in Columbia, Maryland. It produces specialty chemicals and specialty materials in two divisions: Grace Catalysts Technologies, which makes polyethylene and polypropylene catalysts and related ...

  6. Polyurethane - Wikipedia

    en.wikipedia.org/wiki/Polyurethane

    Polyurethane synthesis, wherein the urethane groups −NH−(C=O)−O− link the molecular units A kitchen sponge made of polyurethane foam . Polyurethane (/ ˌ p ɒ l i ˈ jʊər ə ˌ θ eɪ n,-j ʊəˈr ɛ θ eɪ n /; [1] often abbreviated PUR and PU) refers to a class of polymers composed of organic units joined by carbamate (urethane) links.

  7. Chevrolet Vega - Wikipedia

    en.wikipedia.org/wiki/Chevrolet_Vega

    The Chevrolet Vega is a subcompact automobile that was manufactured and marketed by GM's Chevrolet division from 1970 to 1977. Available in two-door hatchback, notchback, wagon, and sedan delivery body styles, all models were powered by an inline four-cylinder engine designed specifically for the Vega, with a lightweight, aluminum alloy cylinder block.