Abstract: An engine induction system includes intake passages connected to inlet ports of an engine, an injector provided in the intake passage for injecting fuel in an intake plenum between the injector and the inlet port, the injector being disposed in such a position that the volume of the intake plenum is greater than the predetermined stroke volume. This ensures improved vaporization and atomization of fuel and mixing of fuel and air, and improves the combustibility and increases the charging efficiency of use of latent heat of vaporization.

Abstract: An air intake system for a fuel injection engine having cylinders equipped with a swirl port and a conventional straight port. The air intake system comprises a swirl control valve for opening or closing the inlet air passage to the straight port, and further comprises an adapter piece installed in the division wall separating the inlet air passages into the swirl port and the straight port. An aperture communicating both inlet air passages is formed in the adapter piece, and the size thereof is optimized in consideration of the size of an air induction hole disposed in the swirl control valve, to thereby obtain a larger operation area of the air fuel ratio of the lean air fuel mixture supplied to the engine.

Abstract: A single overhead cam multi-valve internal combustion engine wherein individual rocker arms operate each of at least three intake valves and two exhaust valves so as to permit adjustment in the lift and timing of the respective valves. A spark plug well is formed in the cylinder head between the exhaust valves to provide accessibility and maintain a compact assembly. Various bearing arrangements are disclosed for journaling the camshafts.

Abstract: A fuel injection structure for an internal combustion engine includes a straight intake port defining passage formed in an intake passage of the engine and a fuel injection valve disposed within a passage-defining wall which defines the straight intake port defining passage therein. The fuel injection valve is arranged inside the intake passage in parallel with a passage axis of the straight intake port defining passage in an elevational view of the engine. The fuel is injected from the fuel injection valve and flows in parallel with the intake air flow. Due to the parallel flow of the fuel and the intake air, the injected fuel does not tend to adhere to the wall surface of the intake port defining passage. This parallel flow is not affected by a change in the speed of the intake air flow.

Abstract: This invention concerns a fuel injector for an engine having a combustion chamber provided with a plurality of intake ports, an intake manifold connected to these ports via a branch, intake valves which open and close the ports, and stems passing through the ports which support the intake valves. A fuel injector body is provided upstream of the branch, and the fuel delivered by this body is ejected near the valve stems of the intake ports via a guide pipe which is branched at its end. The openings in the ends of the guide pipe are preferably situated on the side of the center of the combustion chamber, and inject fuel only when the intake valves are open. A mixing mechanism may also be provided to mix fuel and air in the body of the fuel injector. The ends of the guide pipe may also be further branched toward respectively the center and the outside of the combustion chamber.

Abstract: In a direct injection diesel engine provided with a fuel injector facing the center of the combustion chamber, a fuel injection pump supplying high pressure fuel to said injector, two air intake ports and two exhaust ports disposed in apposition to one another around said injector as center, air intake valves and exhaust valves which open and close these ports in synchronization with the engine, a swirl control valve installed in one air intake port, and a control means which adjusts the aperture of said control valve depending on the fuel injection pressure, the swirl control valve shuts when the fuel injection pressure is low so as to enhance the swirl of intake air. This promotes conversion of fuel to fine droplets, uses air more efficiently in the combustion and thereby reduces smoke generation. On the other hand, when the injection pressure is high, the swirl control valve opens which increases the charging efficiency and makes it possible to withdraw high power from the engine.

Abstract: A multi-valve internal combustion engine has a plurality of intake valves, and the same number of intake ports as there are intake valves, for each engine cylinder. One of the intake ports forms a helical passage, opening into a center of a combustion chamber of the engine at the location of a spark plug, which is disposed adjacent an intake valve located in the center intake port. In addition to a fuel injector disposed in one of the intake ports, a secondary fuel injector, energized so as to inject fuel when the engine operates at lower loads, is preferably disposed adjacent the intake valve located in the one intake port.

Abstract: An intake duct in a cylinder head of an internal-combustion engine has a defined flow profile by which the flow rate of the gas flow is accelerated continuously, specifically up to a first intake duct segment of the intake duct which, as viewed in the flow direction, is situated in front of the valve stem. Subsequently, in a second intake duct segment, the flow rate of the gas flow is reduced continuously, whereby a lower approach flow rate of the valve is achieved. This results in an optimized volumetric efficiency which has a favorable influence on the performance and consumption of the internal-combustion engine.

Abstract: A number of embodiments of multiple valve internal combustion engines embodying a single camshaft for operating all of the multiple valves. The cylinder head is configured in such a way that it is reinforced across the center of the cylinder head by a bridging member and this bridging member can form a bearing surface for a center lobe of the camshaft. The camshaft is offset toward one side of the cylinder head and operates the valves through a plurality of rocker arms. In some embodiment, the rocker arms are journaled on a cam cover upon rocker arm shafts formed with reliefs aligned with openings in the cam cover for passing components such as a spark plug or a fastener for securing the cam cover to the cylinder head. Both single and multiple cylinder embodiments are disclosed.

Abstract: An intake manifold adapted for use with an engine having two intake ports for each cylinder incorporates an aluminum plenum chamber having an air inlet and air outlets twice the number of cylinders of the engine in number, and a plurality of branch pipes of wrought aluminum connected to the respective air outlets of the plenum chamber. One of the two branch pipes to be connected to the intake ports for each cylinder is larger in the length of the channel than the other branch pipe. The two branch pipes are equal in the cross sectional area of the pipe channel, or the branch pipe having the longer channel is smaller than the other branch pipe in the cross sectional area of the channel. The roughness of the inner surface of each branch pipe is up to 10 .mu.m, preferably up to 5 .mu.m, more preferably up to 1 .mu.m, in terms of center line average height.

Abstract: An improved compact induction system for a V type engine including a pair of plenum chambers disposed in the valley of the V. The plenum chambers are shorter than the respective cylinder banks and serve high speed intake passages of the respective cylinder bank and some longer, low speed intake passages of the adjacent cylinder bank and some low speed intake passages of the other cylinder bank. All of the low speed intake passages have the same length.

Abstract: A valve arrangement for a cylinder head assembly employing three intake valves and two exhaust valves for each cylinder. Not all of the intake valves reciprocate along parallel axes and hydraulic adjusters are operatively associated with the camshafts and rocker arms that operate the valves from the respective camshafts. The geometric relationship of the valves is chosen so as to maintain a compact and effective combustion chamber configuration and facilitate machining of the bores in which the hydraulic adjusters are positioned.

Abstract: A fuel injection type internal combustion engine has a pair of intake ports provided in a cylinder head to connect a pair of intake valve bores facing a combustion chamber with a single intake inlet end. A fuel injection valve is disposed in an orientation frm the intake inlet end toward both the intake valve bores and includes an assist-air supply means for finely atomizing the fuel. A valve operating mechanism is provided for selectively stopping the intake through one of the intake ports in accordance with the operational condition of the engine. A control means is connected to the assist-air supply means for controlling the assist-air supply means to stop the supply of assist air from the assist-air supply means in at least a portion of an operational region in which the intake through one of the intake ports is substantially stopped.

Abstract: An intake system, for use with an internal combustion engine having a plurality of intake valves for each cylinder, includes a plurality of intake ports, opening into the combustion chamber side of the internal combustion engine at different distances from a spark plug of the cylinder. The intake valves are controlled to keep an intake port located at the shortest distance from the spark plug opened only slightly in an early intake cycle stage while opening the other intake ports at their desired timings. The intake port located at the shortest distance from the spark plug is subsequently opened at a desired timing, thereby aspirating a substantial quantity of air through the closest intake port at a later time than through the other intake ports.

Abstract: An intake system for with an internal combustion engine, having a plurality of intake valves for one cylinder, includes a plurality of intake ports, opening into a combustion chamber, with openings which extend toward one side of the internal combustion engine. At least one exhaust port, opening into the combustion chamber, has an opening which extends toward another side of the engine, and is formed in the cylinder head on the other side, which is opposite to the one side of the internal combustion engine. The intake ports are arranged so that the center intake port is inclined at an angle larger than an angle at which other, side intake ports are inclined, so as to direct fuel mixture flows, introduced through the side intake ports, toward an inner surface of the cylinder bore above a top of the piston at a lower dead point.

Abstract: A cylinder head and valve train mechanism for an internal combustion engine having six valves per cylinder. There are provided four intake valves and two exhaust valves. In some embodiments, the size of the intake valves is varied because they are served by a common port so as to insure equal flow to the cylinder through all valves. In one embodiment, a single insert forms two of the valve seats. Also, two of the four valves are disposed at acute angles to both a plane containing the cylinder bore axis and a perpendicular plane passing through this axis in many embodiments. In these embodiments, the cam lobes that operate the angularly disposed valves have cam surfaces that are inclined relative to the axis of rotation of the camshaft. In some embodiments, all of the intake valves are operated by a single camshaft. In other embodiments, two camshafts operate different pairs of the intake valves. Various bearing arrangements for the camshafts are illustrated and described.

Abstract: An electromagnetic fuel injection valve includes a fuel swirl element disposed upstream of a valve seat for giving a swirl force to fuel, a fuel injection port disposed downstream of the valve seat, fuel dividing device disposed downstream of the fuel injection port for dividing a fuel flow.

Abstract: A fuel injector device has a fuel swirling element disposed upstream of a valve seat and capable of imparting a swirling force to a fuel supplied thereto, a fuel injection nozzle orifice disposed downstream of the valve seat, and a fuel distributing adapter disposed downstream of the fuel injection nozzle orifice and capable of distributing the flow of the fuel injected by the fuel injection nozzle orifice in two directions. The adapter has an axial fuel passage having a fuel inlet of a diameter greater than that of the injection orifice and an outlet end of a substantially "8"-shape having a minimum diameter smaller than that of the inlet end. The adapter can be formed by preparing a blank having an axial fuel passage and then conducting a plastic work by a punch press on an end face of the blank so as to restrict the outlet end of the fuel passage.

Abstract: A cylinder head construction for a multiple valve engine that permits the use of at least three intake valves while permitting a single piece head construction and offering ease of access of the hold down fasteners for the cylinder head. The intake tappets are all slidably supported within a projection of the cylinder head with the outer tappets being positioned closer to a plane containing the cylinder bore axis so that fastener receiving bores can be formed outwardly from this point without interference from the projection.

Abstract: An intake and fuel/air mixing system for multi-cylinder externally ignited internal combustion engines with at least two inlet valves per cylinder, at least two separate intake pipe arms per cylinder assigned to the inlet valves, and fuel injection. The first intake pipe arms per cylinder are combined into a first group and other intake pipe arms per cylinder are combined into at least one other group. Each group is assigned one throttling member. The first group comprises a common fuel injection, and one injection each is assigned to the intake pipe arms or inlet ports of the other group or other groups. The throttling members of the individual groups are controlled in such a manner that for the region of low air flow rates the first group opens first and the other group or other groups are opened as a function of the speed and load with higher air flow rates.

Abstract: An intake system of an internal combustion engine includes first and second intake valve openings provided in the engine body and exposed to a combustion chamber, first and second intake valves in the engine body for opening and closing the valve openings, respectively, and a valve operating system connected to the intake valves for changing the modes of operation of the valves in compliance with the operation of the engine, wherein the engine body is provided with a swirl producing intake port leading to the first intake valve opening and a substantially linear main intake port leading to the second intake valve opening, and wherein the valve operating system is capable of changing over between a state meeting a low speed operation of the engine in which the first intake valve is operated in a mode corresponding to the low speed operation and the second intake valve is in a resting or substantially resting condition, and a state meeting at least a part of operational ranges of the engine other than the low s

Abstract: A number of embodiments of multiple valve internal combustion engines embodying a single camshaft for operating all of the multiple valves. The cylinder head is configured in such a way that it is reinforced across the center of the cylinder head by a bridging member and this bridging member can form a bearing surface for a center lobe of the camshaft. The camshaft is offset toward one side of the cylinder head and operates the valves through a plurality of rocker arms. In some embodiment, the rocker arms are journaled on a cam cover upon rocker arm shafts formed with reliefs aligned with openings in the cam cover for passing components such as a spark plug or a fastener for securing the cam cover to the cylinder head. Both single and multiple cylinder embodiments are disclosed.

Abstract: An automotive type fuel injection engine has for each cylinder a single intake manifold runner or log connected by siamesed flow passages to multiple side-by-side intake ports in the cylinder head. A fuel injector is installed in the runner upstream of the dividing portion of the runner. A single constant diameter bore is provided through the cylinder head close to the intake ports intersecting the siamesed flow passages at right angles. The bore contains a one-piece rotatable paddle-like valve with a thin plate in a flow passage, the valve being variable rotatable to close off the passage for fuel economy and power control. The valve is self-contained with sealing and guidance disks.

Abstract: The two-stroke engine includes at least one cylinder, a piston reciprocable within the cylinder and a cylinder head which contains at least one exhaust port which is controlled by a poppet valve and at least two inlet ports which are controlled by respective poppet valves and are connected to respective inlet ducts. The inlet ports are of directed type with the axes of the inlet ducts being convergent in the direction of flow whereby the air flowing through them into the cylinder flows preferentially generally towards the cylinder axis. The axes of the inlet ducts pass substantially through the cylinder axis where the air flows through the inlet ports merged to form a single air flow on or adjacent the cylinder axis.

Abstract: A two-stroke engine includes at least one cylinder, a piston reciprocable within the cylinder and a cylinder head which contains at least one exhaust port and at least two inlet ports which are controlled by respective poppet valves. The cylinder defines a combustion chamber of pent-roof form with which the inlet and exhaust ports communicate. The inlet ports are of directed type whereby, in use, the flow of air through them is generally away from the exhaust valve(s) and thus flows down the wall of the cylinder adjacent the inlet port. The axes of the inlet ducts converge in the direction of flow through them and the axis of each inlet defines angle of at least 20.degree. with that of the other inlet duct when viewed in the direction of the cylinder axis.

Abstract: A two-stroke internal combustion engine provided with a masking wall (8a, 40b) which is disposed between an intake valve (6) and exhaust valve (7) disposed on a cylinder head inner wall surface (3a) and which closes the opening between the peripheral edge of the intake valve (6) and valve seat (9) positioned at the exhaust valve (7) side, over the period of full opening of the intake valve (6), and a fuel injection valve (14, 42) which is disposed at the peripheral side portion of the cylinder head inner wall surface (3a) at the intake valve (6) side, wherein the fuel injection from the fuel injection valve (14, 42) to the cylinder (1) is started when the intake valve (6) opens. By this, it is possible to easily ignite the fuel and to stabilize the combustion after ignition.

Abstract: An intake system having first, second and third intake ports connected to first, second and third air intake passages, respectively and up stream ends of three air intake passages are connected to a common air intake passage. The first air intake passage is set to supply air through the first intake port along an inner peripheral surface of the combustion chamber. The second and third air intake passages are set so that axial center lines thereof may intersect an axial center line of the first air intake passage and an intersecting point of the axial center lines of the third and first air intake passages are up stream of the intersection of the axial center lines of the second and first air intake passages. Thus, swirl of intake air in the combustion chamber from the third intake port is stronger than that generated by the intake air from the second intake port. Then, swirl around an ignition plug arranged almost in the center of the combustion chamber is strengthened.

Abstract: A multivalve internal combustion engine uses multiple inlet ports (2,3), each having a separate throttle (6), a fuel injection (7) and an intake valve (5). The individual inlet ports are positioned in such a way that they join the cylinderhead essentially in the same circumferential direction, thereby achieving a continuous unidirectional whirl in the cylinder at all engine speeds and loads. At low engine speeds, only one inlet port is opened; further inlet ports are opened progressively. The diameter of the inlet ports differ in size, whereby the first opened inlet port generates the fastest gas speed and the subsequent inlet ports generate successively slower gas speeds. Achieving an uninterrupted continuous strong whirl turbulence in the cylinder throughout the engine speed range, results in overall higher maximum power output, a clean fast burn and optimum torque characteristics using variable gas column adjustments.

Abstract: An intake system is incorporated in a multi-cylinder internal combustion engine having a plurality of cylinders each being provided with at least three intake ports, at least one of the three intake port being timed to close after the remaining intake ports which are timed to close closely to each other. The intake system includes a main intake pipe introducing intake air into the intake system. The main intake pipe is connected to the remaining intake ports of the cylinder by way of a common intake pipe and to the at least one intake port of the cylinder by way of an intake pipe provided independently from the common intake pipe.

Abstract: A flow duct, particularly an intake duct in an intake system and a cylinder head of an internal-combustion engine has a defined flow profile by means of which the flow rate of the gas flow is accelerated continuously, specifically until it reaches a cross-sectional transition area of the intake duct which--viewed in the flow direction--is situated upstream of a valve stem. After that, the flow rate of the gas flow is reduced whereby a lower approach flow speed of the valve is achieved. This causes an optimized volumetric efficiency which has a favorable effect on the power and the consumption of the internal-combustion engine.

Abstract: A stratified-combustion internal combustion engine according to the present invention comprises at least two intake ports situated on one side of a combustion chamber, guide passages connected individually to the intake ports, a fuel injector disposed in one of the guide passages. Each guide passage has a straight region extending over a predetermined length from its corresponding intake port. Thus, an air-fuel mixture and air, guided by the respective straight regions of the guide passages to be supplied through their corresponding intake ports to the combustion chamber, flow along the axial direction of a cylinder bore, thereby forming barrel swirl flow separated in layers from each other.

Abstract: An improved compact high performance induction system for a V-type engine. The induction system includes a pair of plenum chambers each disposed above a respective one of the cylinder heads and each plenum chamber is provided with runners that serve common intake passages of both the adjacent and remotely positioned cylinder heads.

Abstract: A valve-controlled internal combustion engine has a first valve group consisting of three inlet valves and a second valve group consisting of at least one exhaust valve for each cylinder of the internal combustion engine. The valve axis of one valve of a valve group, relative to valve axis of the other valves of the group, is arranged at a different angle from a center longitudinal plane running through a row of cylindrical bores of the internal combustion engine and is at a different distance from the center longitudinal plane. A camshaft controlling the inlet valves and a second camshaft controlling the exhaust valves or valves are arranged in the cylinder head. Rocker arms for actuating the corresponding cams of the camshafts are rotatably mounted on spindles.

Abstract: A valve placement arrangement for an internal combustion engine including four intake valves and two exhaust valves per cylinder wherein the exhaust valves are disposed across the combustion chamber with ports diametrically opposed externally of the intake valves, spaced as to prevent undue heating and insure minimal thermal loading. The valve placement arrangement provides a double cross flow of intake and exhaust.

Abstract: A variable valve timing and lift mechanism consists of low and high speed cams provided in phase on the camshaft of an overhead camshaft engine, the high speed cam having larger lift than the low speed cam although the base circle diameter of the two is the same. The low speed cam is coupled to port opening/closing valve(s) via a direct-driven tappet and the high speed cam is coupled to the same valve via a piston-type tappet consisting of a pair of pistons sealed in a support with an oil chamber interposed in between. The oil chamber is connected to the lubricating oil circuit of the engine by an oil passage provided with a control valve. This variable valve timing and lift device with the so-called direct attack-type dynamic valve mechanism, where the cam drives the valves directly without using any rocker arm and connecting mechanism, solves the problems created by the inability of the rocker arm, etc.

Abstract: A multi-valve engine of the type having a line of cylinders, intake and exhaust camshafts, and rocker arms for operatively connecting valves to the camshafts includes a first valve group of three valves consisting of either intake valves or exhaust valves and a second valve group consisting of the other of either intake valves or exhaust valves. Each of the valves of the first valve group is oriented such that a valve stem thereof is inclined outwardly to one side of the line of cylinders, while each of the valve of the second valve group is oriented such that a valve stem thereof inclines outwardly to an opposite side of the line of cylinders. First hydraulic lash adjuster means for a centrally-located valve out of three valves of the first valve group is positioned closer to a bore center of the cylinder than the centrally-located valve, or on a delay side in the rotational direction of the camshaft.

Abstract: Throttle valves are individually disposed in a plurality of intake passages of an engine. In normal operation condition of the throttle valves, a first control device controls the throttle valves according to the detection result of an operation condition detecting device to control the amounts of intake air of the individual intake passages, thereby obtaining good engine performance from low-speed to high-speed ranges. When an abnormality detecting device detects an abnormality in a throttle valve, a determination device determines a normal throttle valve, and a second control device controls only the normal throttle valve in preference to the first control device to control the intake air amount, thereby ensuring continued operation even if a malfunction occurs in one of the throttle valves.

Abstract: A multiple valve engine and more particularly an improved combustion chamber and valve arrangement for such an engine that permits high compression ratios, good breathing and a smooth combustion chamber. There are provided three intake valves and two exhaust valves. The center intake valve is supported so that it reciprocates about an axis that lies in a plane containing the cylinder bore axis. The other valves are all inclined to each other so that adjacent edges between the valves will all lie in a common plane that extends perpendicularly to the cylinder bore axis to provide a smooth combustion chamber configuration. In addition, tapered cam lobes on the camshafts operate the angularly disposed valves. These tapered cam lobes have heel diameters that are larger than the adjacent bearing surfaces of the cams so that the cam lobes may be conveniently formed by grinding without damaging the bearing surfaces.

Abstract: A cylinder head and valve train mechanism for an internal combustion engine having six valves per cylinder. There are provided four intake valves and two exhaust valves. In some embodiments, the size of the intake valves is varied because they are served by a common port so as to insure equal flow to the cylinder through all valves. In one embodiment, a single insert forms two of the valve seats. Also, two of the four valves are disposed at acute angles to both a plane containing the cylinder bore axis and a perpendicular plane passing through this axis in many embodiments. In these embodiments, the cam lobes that operate the angularly disposed valves have cam surfaces that are inclined relative to the axis of rotation of the camshaft. In some embodiments, all of the intake valves are operated by a single camshaft. In other embodiments, two camshafts operate different pairs of the intake valves. Various bearing arrangements for the camshafts are illustrated and described.

Abstract: The axes of the three inlet valves associated with each cylinder of an internal combustion engine are parallel to each other. The valves are all operated by the same camshaft which acts on the three valves from above through three interposed rocker arms. The rocker arm of the valve which is in the intermediate position is in a reverse orientation relative to the other two rocker arms.

Abstract: In an intake manifold assembly for a multicylinder internal combustion engine with at least three inlet valves 4, 5, 6, to which lead individual intake manifolds 9, 10, 11 of different length, the shorter individual intake manifold of which 10, 11 can be put into operation, as the revolutions per minute and/or the load increases, by opening the shutoff valves 18, 19, the effective length of each individual intake manifold is shortened to the length of a shorter individual intake manifold, when the latter is put into operation, owing to the fact that appropriate intake ports 22, 24, 26 have been provided, which are controlled by control butterfly valves 23, 25, 27. Such an arrangement accomplishes that the resonating tube length of all individual intake manifolds, which have been put into operation, is the same, so that an optimum power output is ensured.

Abstract: An overhead camshaft engine has a cylinder head, two intake valves and two exhaust valves at each cylinder. A plug hole is formed in a space of a cylinder head between the intake valves and between the intake valves and a camshaft. An end of the plug hole is opened to a combustion chamber at a center position thereof. A spark plug is mounted in the plug hole, so that a center electrode of the spark plug is positioned at the center position.

Abstract: An improved head assembly for an internal combustion gasoline engine having an internal camshaft and push rod system which has a head (20) adapted to utilize four valves per cylinder using push rods (50) without modification to the engine block. The exhaust valves (36) are positioned longitudinally parallel with each cylinder and the inlet valves 38 are at a 10 to 18 degree angle from the engine cylinder centerline. The push rods (50) are so positioned as to allow contact with rocker arms (40) lifting the valves in sequence.

Abstract: A cylinder head structure for a multiple cylinder engine, comprising, at least for each of its cylinders (1) located at either longitudinal end of its cylinder bank: a combustion chamber (13) defined by the cylinder and a piston received therein; an intake passage (18) communicated with an intake manifold (20) at its one end and with said combustion chamber at its other end; and exhaust passage (19) communicated with an exhaust manifold (21) at its one end and with said combustion chamber at its other end; at least one of said intake passage and said exhaust passage being curved toward a longitudinally central part of said cylinder bank as it extends from its other end to its one end. Hence, the size and weight of the intake manifold and/or the exhaust manifold can be reduced.

Abstract: A 4-stroke, internal combustion engine having two intake valves for each cylinder wherein a single rocker-arm assembly actuates both of the intake valves in a timed sequence to provide a stratified charge to the cylinder.

Abstract: A poppet valve for an internal combustion engine, comprising at least two valve stems and a single non circular valve head attached at one end of the valve stems wherein the stems are spacedly parallel to each other. The valve head has an oval or semi-circular peripheral contour for maximum cylinder breathing. The valve stems positively prevent valve head rotation and define a high surface to volume ratio, for increased heat dissipation capacity.

Abstract: An intake valve lift control system for optimizing both rotational movement and inducted flow of a mixture inducted into the chambers of an internal combustion engine. The combustion chamber includes a mask partially surrounding the intake valve seat thereby imparting rotational movement to the inducted mixture. During light load engine operating conditions, maximum valve lift displacement is limited to the height of the mask such that rotational movement of the inducted mixture is maximized during the entire intake stroke of the intake valve. During heavy load engine operating conditions in which optimal flow is desire, maximum valve lift displacement is extended beyond the mask such that flow, rather than rotational movement, is optimized. Commencement of valve lift is also delayed during normal engine operations such that rotational movement of the inducted mixture is further optimized.

Abstract: An improved cylinder head arrangement for a multiple valve internal combustion engine wherein the cylinder head supports three intake valves that communicate with a common intake passage extending through one side of the cylinder head. An associated manifold is affixed to the cylinder head and has two inlet openings and a transition portion that forms a smooth transition from these two inlet openings to the single intake passage of the cylinder head.

Abstract: Several embodiments of cylinder head and valve train configurations for an overhead valve internal combustion engine that permits increased valve area without interference and while maintaining simplified valve actuation. In each embodiment one pair of valves is operated by one cam shaft and lies on one side of a plane containing the axis of the cylinder. Three other valves are positioned primarily on the other side of the plane and reciprocate about axes that are not parallel with each other. These axes, however, intersect so that each of these three valves may be operated by the same cam shaft. In one embodiment of the invention the intersection of the valves axis is coincident with the axis of rotation of the respective cam shaft so as to permit direct actuation of the valves. In another embodiment the intersection lies substantially along a plane that intersects the stems of the valves when they are closed to facilitate operation of multiple valves from a single cam lobe by means of a single rocker arm.

Abstract: Herein disclosed is a valve actuating mechanism having a stopping function for use in an internal combustion engine of the type, in which at least one pair of intake or exhaust valves having an identical function and disposed adjacent to each other are arranged for one cylinder. First and second rocker arms respectively having arms abutting against the upper ends of the paired intake or exhaust valves are rockingly supported on a common support shaft which is fixed on the engine body while having an axis perpendicular to the operating directions of the valves. The first rocker arm is formed with a cylinder bore which is opened toward the second rocker arm to bear a plunger therein whereas the second rocker arm is formed with a guide bore which is opened toward the first rocker arm to fit the plunger therein.