Abstract: A piston for a direct fuel injection engine is described. The piston comprises a cylindrical skirt and a piston face. The cylindrical skirt has an axis. The piston face has a bowl. The bowl has a wall extending about an axis in inclined relation to the cylindrical skirt axis. An engine is also described. The engine comprises an engine block defining an engine cylinder and a piston moveable axially in the engine cylinder. The piston comprises a cylindrical skirt and a dome-shaped piston face, the piston face having therein a bowl. The bowl located with the cylinder axis passing therethrough. The bowl is defined by a cylindrical wall extending about an axis extending in inclined relation to the axis of the cylinder. The bowl includes a bottom wall extending perpendicularly to the bowl axis. The engine also comprises a fuel injector nozzle adapted to direct a spray of fuel toward the bowl for deflection toward a spark plug disposed on the opposite side of the cylinder axis from the fuel injector.

Abstract: An adjustable rebound damping shock absorber (10) has an inner cylinder (14) disposed within and spaced radially from an outer cylinder (13) to form a reservoir (20) therebetween, a piston assembly (15) slidably disposed within the inner cylinder, a piston rod (16) extending from the piston assembly through a first end (11) of the inner and outer cylinders, and a closure (17). The closure has a fluid flow path providing fluid communication between a rebound chamber (36) and the reservoir. The fluid flow path has a variable jet (88), a variable orifice (85) and a variable spring (86) actuated damping valve (87) for controlling fluid flow from the rebound chamber and the reservoir. The jet, the orifice, the spring rate and damping valve are simultaneously adjustable by an adjusting pin (73). The variable spring has a tapered portion which varies in outside diameter from one end of the portion to the other end of the portion, creating a variable spring rate.

Abstract: Disclosed herein is a method of operating a two-stroke internal combustion engine so as to promote reduction in engine exhaust emissions, which two-stroke internal combustion engine includes a combustion chamber, a pump operable to periodically pump air unmixed with fuel into the combustion chamber, a fuel injector communicating directly with the combustion chamber and operable to periodically inject fuel unmixed with air directly in the combustion chamber to provide a fuel charge, an ignition system operable to periodically ignite the fuel charge in the combustion chamber, and an exhaust system including an exhaust manifold communicating with the combustion chamber and operable to produce, in the engine exhaust gas, a thermal reaction so as to reduce engine exhaust emissions, which method includes the steps of pumping air unmixed with fuel to the combustion chamber, injecting fuel unmixed with air directly into the combustion chamber so as to provide a fuel charge and at an injecting timing which is retarded

Abstract: A two-stroke internal combustion engine comprising an engine block, a plurality of crankcases and including a mounting surface having therein a plurality of inlet openings each communicating with a respective one of the crankcases, a throttle housing defining a throttle passage and including a plenum mounting surface, a throttle valve in the throttle passage, and a plenum member which is separable from both the engine block and the throttle housing and which defines a plurality of intake passages each having an outlet end communicating with a respective one of the inlet openings and each having an inlet end communicating with the throttle passage such that the intake of the engine can be tuned solely by modifying the configuration of the plenum member.

Abstract: A marine propulsion device comprising a propulsion unit which is adapted to be mounted on a boat and which includes a propeller shaft and an internal combustion engine drivingly connected to the propeller shaft, the engine including engine block structure having a combustion chamber and defining an air intake passage communicable with the combustion chamber, a throttle plate movably supported by the engine block structure and located in the air intake passage, structure for moving the throttle plate in response to movement of an operator control member, and structure supported by the engine block structure for providing a signal indicating the position of the control member independent of the position of the throttle plate.

Abstract: A two-stroke internal combustion engine comprising a combustion chamber, a fuel injector for injecting fuel into the combustion chamber, an intake passage communicating with the combustion chamber, the intake passage including a venturi section, a throttle in the intake passage, and an engine control for sensing the pressure P.sub.V in the venturi section during engine operation, for sensing throttle position TP, for determining, in response to TP, a specific amount of fuel to be injected by the fuel injector, and for modifying the specific amount of fuel in response to P.sub.V.

Abstract: A two-stroke internal combustion engine comprising an engine block, a plurality of crankcases and including a mounting surface having therein a plurality of inlet openings each communicating with a respective one of the crankcases, a throttle housing defining a throttle passage and including a plenum mounting surface, a throttle valve in the throttle passage, and a plenum member which is separable from both the engine block and the throttle housing and which defines a plurality of intake passages each having an outlet end communicating with a respective one of the inlet openings and each having an inlet end communicating with the throttle passage such that the intake of the engine can be tuned solely by modifying the configuration of the plenum member.