Abstract: A distributor for an internal combustion engine and associated methods comprise a camshaft having a drive gear thereon, a trigger disk positioned on the camshaft so as to rotate coaxially therewith, the trigger disk having a plurality of tabs defining a window between adjacent tabs, an optical sensor positioned relative to the trigger disk so that the plurality of tabs passes within sensor range as the trigger disk rotates on the camshaft, the sensor generating signals responsive to detection of the plurality of tabs, and a microprocessor operatively linked with the optical sensor and programmed with one or more ignition curves providing predetermined rates of ignition advance responsive to signals from the optical sensor.

Abstract: A valve tappet for actuating a valve lifter in an internal combustion engine. The present invention has greater strength and improved oil flow control as compared to conventional tappets. The present invention achieves these objectives through a design that maintains essentially continuous contact with the internal surface of the lifter bore throughout the entire length of the tappet. Throughbores are formed in the tappet body allowing oil flow therethrough. The resulting tappet does not have the abrupt edges associated with conventional tappet designs, this also minimizes scuffing of the lifter bore, an additional problem associated with conventional tappets.

Abstract: An improved rocker arm adjusting nut characterized by an upper collar, a lower flange and an axially elongated body with a substantially cylindrical central section that is provided with knurling, or grooves in the axial direction. The upper collar and knurling deflect oil axially towards the lower flange when used according to its intended purpose with a stamped steel rocker arm, of conventional design. The enlarged mass and surface area of the adjusting nut helps both to dissipate temperature from the pivot ball-rocker arm interface, by conduction, and deflect oil towards the pivot ball-rocker arm interface.

Abstract: A valve spring retainer assembly includes a valve stem for reciprocation with respect to an engine head. A valve spring retainer provides a thrust surface against which a valve spring biases the valve stem into a closed position. The retainer includes an annular lock portion for preventing extrusion of the retainer key through the valve spring retainer.