Abstract: An internal combustion engine has a cylinder head defining an exhaust valve guide bore with a side wall and an end wall, and an exhaust valve stem passage extending between an exhaust port and the end wall of the bore. A diameter of the passage is less than a diameter of the bore. An exhaust gas valve guide is positioned in the bore and spaced apart from the end wall to form an air gap therebetween.

Abstract: An atomization valve for use as an intake valve in an internal combustion engine that consists essentially of an elongated valve stem with two opposed ends, a valve head located at one of the two opposed ends and formed integrally with the valve stem in which the valve head having an outer rim and a tapered shoulder portion terminating adjacent the stem portion and the tapered shoulder portion having an upper surface bearing a plurality of grooves.

Abstract: Embodiments of the present disclosure generally provide a disc-valve design with a self-cleaning feature. The self-cleaning feature may be integrated into the valve, for example, by removing a “cut-out” portion between sealing surfaces of ports. These cut-out portions may create vortices that might clean debris from the sealing surfaces. The cut-outs may also provide a place for debris to collect-keeping it away from the sealing surfaces. In addition, or as an alternative to cut-outs, some other type of mechanism, such as sealing members designed to disturb flow to sweep away debris near a sealing surface or helical grooves (rifling) formed in the ports, may also be used to promote self-cleaning.

Abstract: A highly-efficient, yet simply constructed internal combustion engine includes an intake cylinder to accommodate intake and pre-compression of an oxidizing agent, a combustion cylinder to accommodate a further compression of the oxidizing agent, an injection and ignition of fuel, and a partial expansion of combustion gases produced by the ignition of fuel; and an exhaust cylinder to accommodate a further expansion of the combustion gases and subsequent exhausting of the further expanded combustion gases. A reciprocating piston is inside each of the intake, combustion and exhaust cylinders and a crankshaft is coupled to the reciprocating pistons. A first transfer passage facilitates flow of the pre-compressed oxidizing agent from the intake cylinder to the combustion cylinder and a second transfer passage facilitates flow of the partially-expanded combustion gases from the combustion cylinder to the exhaust cylinder.

Abstract: Disclosed is an engine that comprises an engine block, and the engine block comprises a cylinder. The engine further comprises a cylinder head mounted to the engine block, and the cylinder head comprises an intake valve seat and a shroud. Further yet, the engine comprises a combustion chamber formed at least partially by the cylinder and the cylinder head. The intake valve is configured to travel between a fully closed position seated against the intake valve seat and an opened position displaced from the intake valve seat, thus allowing intake flow through the intake valve seat into the combustion chamber. The shroud only partially surrounds a periphery of the valve and extends along at least a portion of the travel of the intake valve so as to restrict intake flow along only a portion of the intake valve.

Abstract: An intake control system for a multi-cylinder combustion engine with control valves positioned within intake passageways that can vary the cross-sectional area of the intake runners to increase air intake velocity at low engine speeds. The control system includes an inner frame that can be inserted into a lower manifold after manufacture. The inner frame includes a plurality of flapper valves that are actuated by a four-bar link design, which is driven by a hypoid gear-set. The control system controls an internal DC electric motor that actuates a worm-drive gear-set, which in turn drives the hypoid gear-set to either engage or retract the flapper valves within the intake passageways.

Abstract: A ring insert for an air intake conduit for an internal combustion engine comprising a sleeve-shaped body which is tightly mounted within the air intake conduit. The body has an inner surface which includes an annular surface in the shape of a truncated cone defining an annular inclined surface that is narrower at the forward edge of the body than at the rearward edge forming a venturi directly adjacent the rearward edge. The forward edge of the body is smoothly contoured and the rearward edge of the body is smoothly contoured.

Abstract: An atomization valve for use as an intake valve in an internal combustion engine that consists essentially of an elongated valve stem with two opposed ends, a valve head located at one of the two opposed ends and formed integrally with the valve stem in which the valve head having an outer rim and a tapered shoulder portion terminating adjacent the stem portion and the tapered shoulder portion having an upper surface bearing a plurality of grooves.

Abstract: An intake control device of an internal combustion engine in which an intake path of each cylinder is partitioned into an upper and a lower path and a tumble control valve and an intake pressure control valve are provided to open/close the upper path and lower path respectively. In a given driving condition, the intake air flow velocity in the lower path is increased by closing the tumble control valve, thereby generating a tumble flow in the combustion chamber. In this process, the intake pressure control valve is opened around start of an intake stroke and closed around its end to make intake pressure downstream of the intake pressure control valve higher than upstream of it to increase the difference between upstream and downstream intake pressures in the intake stroke. This increases the intake air flow velocity in the lower path and intensifies the tumble flow in the combustion chamber.

Abstract: An internal combustion engine having a cylinder and a piston movable in the cylinder, the cylinder and piston defining a combustion chamber enclosed by the cylinder and the piston, a surface of at least one of at least one component of the combustion chamber and an adjoining space that comes into contact with at least one of a fuel-air mixture to be combusted and with motor oil has, at least in certain areas, a catalytic coating for oxidizing carbonization residues, the coating consists of a ternary vanadium oxide compound and at least one other compound of at least one metal oxide, the metal oxide is at least one of the group consisting of a cerium oxide, an oxide of another rare-earth metal, an oxide of lanthanum (La), and an oxide of a transition metal.

Abstract: An auxiliary valve positioned in an intake passageway of a four-cycle internal combustion engine for controlling the flow of air/fuel mixture into a combustion chamber includes a through passage, the through passage defined by a top wall, a bottom wall, and opposing side walls; a swingable door openable and closable in relation to the through passage; and a spring loaded assembly biasing the swingable door closed.