| 摘要 |
An air injection pipe assembly adapted for delivering atmospheric air to the exhaust manifold of vehicle engine comprises a manifold air tube having an inlet and a plurality of spaced outlets. An air inlet valve having an outlet pipe is snugly projected into the manifold air tube and crimped thereto. A plurality of irregularly shaped air injection tubes at their one ends project into the manifold air tube outlets respectively and are brazed thereto and a flair fitting is secured upon the other end of each of the air injection tubes adapted for projection into spaced openings of a vehicle exhaust manifold for securing thereto. The method of making an air injection tube comprises the steps of forming a manifold air tube into U-shape and assembling the outlet of an air valve into one end of the air tube and annularly crimping one end of the manifold tube around the outlet of the air valve. Further steps include forming a plurality of outlets along the length of the air manifold tube and providing a plurality of injection tubes of irregular shape and projecting the one ends of said injection tubes into the respective outlets and brazing the one ends of the injection tubes to the manifold tube. A final step includes assembling a flare fitting upon the other end of each of the injection tubes adapted for projection into spaced apertures along the length of the vehicle exhaust manifold.
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