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An electromagnetic fuel injector for use in an internal combustion engine has a center pole piece with an axially extending bore which slidingly accepts an adjusting pin therein. The adjusting pin has a first end portion for engagement with the armature return spring of the injector. Axial translati

An electromagnetic fuel injector for use in an internal combustion engine has a center pole piece with an axially extending bore which slidingly accepts an adjusting pin therein. The adjusting pin has a first end portion for engagement with the armature return spring of the injector. Axial translation of the adjusting pin, relative to the center pole piece will vary the compression on the spring, the seating load on the armature valve and, as such, the dynamic flow characteristic of the injector. The adjusting pin further has means for engaging the center pole piece to rotate the piece which is threadingly engaged within the injector housing. Rotation of the threaded piece relative to the housing varies the armature/valve travel and, as such, the static flow characteristic of the injector.

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An electromagnetic fuel injector comprising a housing, a coil disposed at one end of said housing and a valve seat disposed at a second end to define a fuel chamber therebetween, a center pole piece extending through and below said coil and having an end portion situated within said fuel chamber, an

An electromagnetic fuel injector comprising a housing, a coil disposed at one end of said housing and a valve seat disposed at a second end to define a fuel chamber therebetween, a center pole piece extending through and below said coil and having an end portion situated within said fuel chamber, an armature/valve member disposed within said fuel chamber, in spaced relationship to said end portion of said center pole piece, for reciprocal movement between a valve closed position in which the armature/valve member engages said valve seat to preclude fuel delivery therethrough and a valve open position in which said coil is energized to draw said armature/valve member off of said valve seat to allow fuel from said chamber to flow therethrough, said center pole piece having an axial bore extending therethrough configured to receive an armature valve return spring, said spring having a first end operable on said armature/valve member and a second end in communication with one end of an adjusting pin, said pin disposed for axial translation within said axial bore of said center pole piece to thereby vary the spring rate of said armature/valve return spring and the dynamic response of said injector upon pulse width energization of said coil, said center pole piece in threaded engagement with said housing and rotatable, through rotation of said adjusting pin, to advance and retract said pole piece relative to said coil and said armature/valve member to thereby vary the spaced relationship of said armature/valve member relative to said end portion of said center pole piece.