Abstract: An apparatus for improving engine performance at wide-open throttle or full load by supercharging the induction system. An expanded/enlarged volume plenum is divided into two chambers. each containing a group of three openings for flowing air past inlet valves to three cylinders of a six cylinder engine, for example. A pair of adjustable length intake runners are connected to the upstream end of the plenum and are adjusted with changes in engine speed to resonantly tune the induction system for the speed changes to effect greater input of air to the cylinders. A valve can be opened to communicate the chambers with each other to further resonantly tune the system at intermediate speeds. At the higher engine speeds, resonant tuning in conjunction with the ram induction of air into the cylinders further increases the mass flow of air.

Abstract: A metal laminate gasket of the invention is used for an internal combustion engine having at least one hole to be sealed. The gasket is basically formed of first and second metal plates extending substantially throughout an entire area of the engine. The first plate includes an annular recess formed at an upper side around a first hole to form a stepped portion. The second plate includes a curved portion to define a second hole to be located inside the first hole, and a flange extending from the curved portion in a direction away from the second hole. The flange has a thickness greater than the depth of the annular recess. When the gasket is assembled, the flange is located above the annular recess. The flange provides surface pressure around the hole of the engine greater than that outside the recess when the gasket is tightened. The surface pressure around the hole may be precisely adjusted.

Abstract: A fuel supply system and method incorporates a fuel pump for pressurizing liquid fuel for use in an internal combustion engine. The pressurized fuel is supplied to a fuel injector mounted on a vaporization chamber; actuation signals applied to the fuel injector atomize a metered quantity of liquid fuel into the chamber. The atomized fuel travels a tortuous path in the chamber striking chamber walls heated by hot exhaust gas from the internal combustion engine. Vaporized fuels delivered from the vaporization chamber to a mixing chamber to be mixed with air to form a combustible fuel/air mixture. Air supplied to the mixing chamber is heated by exhaust heat prior to delivery to the mixing chamber. The combustible fuel/air mixture is then supplied to the intake manifold of the internal combustion engine.

Abstract: The air intake system of a two-bank internal-combustion engine has one resonance receptacle for each cylinder bank and an additional receptacle in the respective center. Via suction pipes, the resonance receptacles are connected to the cylinders and are mutually provided with connecting pipes, fresh air entering into one of these connecting pipes. Suction pipe extensions are connected to the other receptacle which partially extend inside the resonance receptacles and are arranged in them at a distance in an alignment with the admission funnels of the suction pipes. The combination of the connecting pipes acting as resonance pipes and the suction pipe extensions acting as swing pipes causes an increase of the mean pressure which raises the torque as well as the performance of the internal-combustion engine.

Abstract: A fuel engine combustion aid having a first guide hole connected to the positive crankcase ventilation pipe of a fuel engine, a second guide hole connected to the intake manifold of the fuel engine and having a middle part communicated with the first guide hole, an air chamber at one side mounted with an air filter box, a valve chamber communicated between the air chamber and the second guide hole, a valve installed in the valve chamber and controlled by the fuel engine to let fresh air be drawn through the air chamber and the valve chamber into the second guide hole then into the positive crankcase ventilation pipe via the first guide hole upon each intake stroke of the fuel engine.

Abstract: A variable displacement engine includes a rotatable crankshaft having a journal, a cam having an eccentric opening that receives the crankshaft journal, a piston rod assembly having one end journalled on the eccentric cam, and the cam also having an arcuately extending cavity that has gear teeth formed in its outer wall that are at a constant radius distance from the radial center of the eccentric opening, and a gear wheel disposed within the cavity and engaging the gear teeth for selectively adjusting the angular position of the cam relative to the crankshaft journal.

Abstract: Disclosed herein is a four-stroke engine comprising a block having an intermediate portion defining a cylindrical bore having an axis, a head end, and a crankcase end, a head end portion extending from the head end of the intermediate portion in integral one-piece relation thereto and including a planar valve seat surface extending at an acute angle to the axis of the cylindrical bore and having a valve seat with a center and a perimeter defined by a radius extending from the center, and a crankcase end portion extending from the crankcase end of the intermediate portion in integral one-piece relation thereto and including a partially cylindrical portion coaxially aligned with the cylindrical bore, and a recessed portion extending from the partially cylindrical portion and having a peripheral wall spaced at a distance greater than the radius from a line extending perpendicularly to the valve seat surface and from said valve seat center.

Abstract: Flame glow unit for heating the combustion air for a combustion device, especially an internal combustion engine. A flame glow plug, which is placed in the air duct of the combustion device, is supplied by a control device with current and fuel, and forms an ignitable air-fuel mixture together with the in-flowing air, which is ignited by a heating element provided in the flame glow plug. The resulting flame heats the air in the air duct. The air current in the air duct is measured by an air current measuring device and the control device controls the fuel supply of the flame glow plug in response to the measurements which the control device receives from the air current measuring device.

Abstract: An improved intake manifold and plenum construction for an electronic fuel injected engine. The manifold includes a plurality of parallel runners, with each runner having a lower end communicating through a port in the cylinder head with a cylinder of the engine, and an open upper end. A fuel injector is mounted in each runner for injecting fuel into the runner. A plenum is mounted on the manifold and includes an upper wall and a lower wall which is spaced from the upper wall to define an air chamber, The upper ends of the runners communicate with the chamber, so that air is drawn from the chamber through the runners to the cylinders.

Abstract: A combustion chamber for an internal combustion engine is provided which includes a cylinder head body having at least one generally dome-shaped combustion chamber defined by a lower surface of the body and having an intake side and an exhaust side, and a spark plug bore disposed in the combustion chamber so that when a spark plug is engaged in the bore, the dome-shaped portion is provided with an upper surface configured to shelter the electrode from direct impingement of a fresh charge introduced into the combustion chamber through the intake side.

Abstract: Liquid fuel is burned by feeding a mixture of a liquid together with liquid fuel which has been pre-gasified by rapid heating into a combustion zone. The liquid fuel is gasified by contact with a hot body. An internal combustion engine comprises a heated chamber having a heater, an air inlet and a fuel inlet. The mixture of gasified fuel and air is then introduced into the inlet manifold of the engine. Atomized liquid fuel and air is also inducted into the engine in a conventional manner, such as via a carburettor.

Abstract: An exhaust port is formed in the wall of a cylinder of a 2-cycle engine. At least one of the portions of the cylinder wall which define two vertically opposing edges of the exhaust port is projected at the circumferentially mid portion towards the opposing edge so as to provide a piston guide surface which conforms with the inner peripheral surface of the cylinder and which extends in such a manner as to reduce the axial height of the exhaust port. The piston guide surface serves to suppress vibration and noise caused when an upwardly moving piston falls into the exhaust port.

Abstract: The ram tube of this invention basically consists of an intake bracket, inner tube, output bracket, outer tube, input port and output port. The intake and output brackets are attached to the ends of the inner tube for attaching the ram tube to the base of a carburetor and the intake to an intake manifold of an internal combustion engine. The outer tube is installed over and surrounds the inner tube to create a passage between the inner and outer tubes. Exhaust is directed from the exhaust manifold of the engine to an input port on the outer tube. The exhaust passes through the passage and exits through the output port. The exhaust heats the inner tube to in turn heat the air/fuel mixture passing through the inner tube. The fuel is completely vaporized and placed in a dry vapor condition as it passes through the heated inner tube. The fuel entering the combustion chamber in a dry vapor condition burns more completely, at a higher temperature and at a faster rate to provide a higher efficiency engine.

Abstract: Disclosed herein is a four stroke internal combustion engine comprising a cylinder head fabricated of metal and including an intake manifold mounting surface, and an intake passage including a port in the intake manifold mounting surface, an intake manifold fabricated of metal and including a cylinder head mounting surface, and an intake passage including a port in the cylinder head mounting surface, a fastener connecting the intake manifold to the cylinder head with the ports in registration and with the cylinder head mounting surface and the intake manifold mounting surface in metallic surface-to-surface contact, and a seal between the intake manifold mounting surface and the cylinder head mounting surface.

Abstract: A number of embodiments of improved reed valve mechanisms for reciprocating machines wherein an arrangement is provided by employing a magnet releasably restraining the valve element in one of its positions so as to permit a stiffer valve to be employed while, at the same time, insuring against loss of volumetric efficiency and control. An adjustable stopper plate is also described.

Abstract: A vaporization chamber for fuel in an internal combustion engine has a heater associated therewith that operates the chamber at an efficient super heated temperature in the range of 350.degree. F. to 400.degree. F. This chamber has baffles that direct an angular contoured flow path of fuel and vapors for increased exposure to the heat. The vaporization chamber is associated with heat sensors that control fire extinguishers in the event of overheating or fire. The vaporization chamber as well as its inlet and outlet are closed to atmosphere and include oxygen sensors to provide an alert in the event oxygen enters the chamber. Outlet of vaporized fuel from the chamber can be drawn into the engine by engine vacuum or in another arrangement a fan is associated with the outlet to assist this vacuum flow. Electrical controls under the influence of the vehicle throttle are provided to control the volume of flow of the vapor to the engine and bypass of fuel to the outlet.

Abstract: An emission control assembly comprised of a tubular member defining a chamber in which is positioned an elongated element having elliptically-shaped depressions wherein the assembly is disposed in a fuel line upstream of the internal combustion engine.

Abstract: A fuel injection system for a multi-cylinder internal combustion engine is provided. This fuel injection system includes a plurality of fuel injection valves each arranged to inject fuel into an intake port of each cylinder of the engine, an air passage connected to a portion of an air intake passage leading to the intake ports, a plurality of branch air passages each communicating with a preselected portion around an injection nozzle of each fuel injection valve, an air control valve, connecting between the air passage and the plurality of branch air passages, for selectively introducing a portion of intake air in the air intake passage to the preselected portions around the injection nozzles of the fuel injection valves.

Abstract: A fluid system of an internal combustion engine has controls and a separate radiator for maintaining the temperature of incoming engine combustion air at optimum conditions.

Abstract: A flexible line trimmer is powered by a two-stroke internal combustion engine. The engine is scavenged in a uniflow fashion and has a scavenging cylinder and an exhaust cylinder connected by a common combustion chamber. Each cylinder has a piston turning one of two cantilevered crankshafts that are geared through adjacent counterweights having integrally formed teeth. The crankshafts extend in opposite directions for self-balancing. One crankshaft is coupled to a flywheel fan and other coupled to a starter. A fuel and air mixture is transferred to a common crankcase for the crankshafts through an intake port located on the exhaust cylinder. The piston of the scavenge cylinder is retarded with respect to the exhaust cylinder. An exhaust window opens prior to a scavenge window. The scavenge window closes after the exhaust window. The exhaust window is shortened to improve crankcase compression. The cylinders are joined in a siamese fashion, fabricated from a single piece, and skewed toward each other.