Abstract: Embodiments of the scavenge passages and the scavenge ports for a two cycle crankcase compression engine wherein the scavenge ports have their side edges tapered outwardly to facilitate the flow into the cylinder block.

Abstract: A magnetic focusing fuel treating assembly coupled to the fuel line of an internal combustion engine. The assembly includes a ferromagnetic plug that extends through the inner hole of an annular permanent magnet. The plug and the magnet are separated by a precise annular gap. Attached to the magnet and located at the ends of the plug are a pair of ferromagnetic end plates. The magnet emits a focused, concentrated magnetic field that flows into the fuel. The focused magnetic field has been found to improve the performance of the engine, demonstrated by improved fuel economy and reduced emissions.

Abstract: A pair of embodiments of flame arrester arrangements for marine propulsion engines wherein the flame arrester is positioned vertically above the thermostat housing at one end of the engine and the plenum chamber for the intake manifold is disposed above the exhaust elbow of the engine so as to provide good induction efficiency and compact size. Different configurations of flame arresters are disclosed and they both provide very large effective inlet areas and, at the same time, good flame protection.

Abstract: An internal combustion engine of a spark ignition type is so arranged as to set an air-fuel ratio of a mixed fuel to become substantially stoichiometric in the range of from A/F=13 to A/F=16 at the time of running in a high load region and to recirculate exhaust gases into the intake system. For the internal combustion engine of a natural intake type, the compression ratio is preferably set to 11 or larger; for the internal combustion engine of a supercharging type, the compression ratio is preferably set to 9 or larger. The rate at which the exhaust gases are recirculated is preferably set to be constant or to become larger as the load of the engine becomes larger.

Abstract: A cylinder block has a cylinder block body and a cylinder liner block mounted by casting in the cylinder block body. The cylinder liner block is formed from a material having a rigidity larger than that of the cylinder block body, and the cylinder liner block comprises a liner section mounted by casting in position in a cylinder barrel portion of the cylinder block body, and a reinforcing wall section mounting by casting in position in a bearing wall of a crank case portion of the cylinder block body in a. Thus, it is possible to increase the wear resistance of cylinders in the cylinder block, as well as to provide an increase in performance by reductions in vibration and noise of the engine including the cylinder block, and to provide reductions in size, weight and cost of the cylinder block by a reduction in thickness of the bearing walls.

Abstract: An apparatus including a first chamber in operative communication with a carburetor to receive carburetor fluid flow therefrom, directing such fluid flow through a central conduit into a second chamber in operative fluid communication with an intake manifold of an associated internal combustion engine, such that the central conduit is arranged for the heating and associated gaseous flow from the carburetor to the intake manifold.

Abstract: Adjustment to the lubrication rate for a period of time after startup of a two-stroke internal combustion engine, wherein the magnitude of the adjustment over the period of time is determined from an estimate of the degree the lubricant has receded from the moving parts of the engine exposing the moving parts to an elevated potential for wear, and from an estimate of the rate at which lubricant in the engine may be recirculated to the moving parts to reduce the elevated potential.

Abstract: A shaft engine including a piston moved in a cylinder to reciprocate at least one cylinder shaft causing it to turn a crank shaft, the at least one cylinder shaft having a respective longitudinal air passage linked to either raised air chamber on the cylinder through a respective extension tube on either raised air chamber for sending exhaust gas out of the cylinder.

Abstract: An intake pipe is connected to an upstream side of a throttle valve of an engine having first and second cylinder banks of a cylinder block formed in a V-like configuration. An intake path is branched, at its intermediate part on a downstream side of the throttle valve, into first and second branch paths by a branch tube, and the first and second branch paths are provided at their downstream end portions with first and second surge tanks, respectively. The first and second surge tanks are connected to each other through a communication pipe. An upper portion of the intake pipe is disposed between the first and second surge tank and under the communication pipe and is firmly secured directly to the communication pipe.

Abstract: A four-stroke engine comprising an engine frame including a block and a head, the block forming at least one cylinder, and a crankcase. A piston is mounted for reciprocation in the cylinder, and a crank and connecting rod are mounted in the crankcase and connected to the piston. The head supports an intake valve, an exhaust valve, and a valve actuating mechanism, and a valve cover forms an enclosure with the head that encloses the valves and mechanism. The crankcase includes a fuel inlet port and an outlet port, and a duct connects the outlet port to the enclosure in the valve cover. The inlet port is connected to a supply of a combustible mixture comprising fuel, lubricating oil and air. During engine operation, the mixture flows through the crankcase from the fuel inlet port to the outlet port, the piston functioning as a pump to move the mixture. The oil in the mixture lubricates the engine parts in the crankcase.

Abstract: An air intake heating system and method for use in a diesel engine having a battery and alternator is provided for minimizing white smoke emissions without excessively depleting the engine battery at low engine speeds wherein the battery and not the alternator is the principal contributor of power to the air intake heater.

Abstract: A double-acting piston engine has a crankshaft rotatable about a first central axis and having a crankpin having a second central axis which is spaced a distance from the first central axis, a cylinder assembly having a pair of cylinder chambers confronting each other along an axial line perpendicular to the first central axis, with the crankpin being disposed substantially between the cylinder chambers, and a piston assembly slidably disposed in the cylinder chambers and coupled to the crankpin.

Abstract: A vacuum relief valve for use with internal combustion engines is provided. The valve is connected to the breathing tubes of an engine on one side and to the air induction system of the engine on the opposite side. Under certain conditions during engine operation, the induction system has a tendency to reduce the pressure within the crankcase creating a partial vacuum. The vacuum relief valve is interposed between the induction system and the crankcase and control or limits the amount of partial vacuum thus created to a maximum of seven inches of vacuum or less. This is accomplished by providing means for limiting the size of a passageway through the valve and thereby limit the amount of suction that can be communicated by the induction system to the crankcase. In one embodiment, a spring biased piston is used to control the size of the passageway. Other valving mechanisms are also contemplated.

Abstract: A device for converting a combustible liquid fuel into converted fuel having a smaller proportion of vapor and a larger proportion of microscopic fuel droplets, mixing the converted fuel with air in a manifold to convert more of the converted fuel to a vapor and transferring the converted fuel and air mixture into a combustion chamber is provided. The device includes a vacuum chamber formed as a cylindrical housing wall having a longitudinal axis with at least one fuel inlet in the housing wall and a fuel outlet in the housing wall offset from the inlet. An eccentrically mounted cylindrical rotor is provided within the housing wall for rotation about a longitudinal axis about bearings mounted in opposite end walls. The rotor has one or more radial slots and a generally rectangular vane slidably received in each of the slots. Each vane is urged outwardly against the housing wall when the rotor is rotated.

Abstract: A two-stroke engine comprising two exhaust valves and two intake valves. These exhaust valves and these intake valves are arranged on the peripheral portion of the inner wall of the cylinder head, and one additional exhaust valve is arranged on the central portion of the inner wall of the cylinder head. The valve openings of the two intake valves, which are located on the exhaust valves side, are masked by the masking walls.

Abstract: A thermally conductive sealing system for the cylinder head joint of an internal combustion engine is disclosed comprising a spacer plate clamped in direct contact between the cylinder head and the cylinder block and a plurality of discrete fluid gaskets disposed across the spacer plate and clamped between the cylinder head and cylinder block. The flange of a cylinder liner is received in a bore of the spacer plate and a combustion gas seal or "fire ring" is clamped in the bore between the cylinder head and the cylinder liner flange. The combustion gas seal includes a malleable sealing ring for sealing between the cylinder head and the cylinder liner and a hardened backing ring for supporting the sealing ring. The plurality of discrete fluid gaskets includes a removable lifter compartment gasket including sealing elements attached across a substrate and a plurality of coolant ferrules for sealing across coolant ports and around cylinder head bolts.

Abstract: A double-headed swash plate type Stirling engine includes double headed pistons defining front spaces and rear spaces and anchored to the swash plate by shoes. Thus, the reciprocal movement of the double-headed pistons, resulting from the expansion and compression of an operating gas in the front and rear spaces, are directly converted into the rotary movement of the swash plate. Hence, the Stirling engine has a very simplified construction.

Abstract: An exhaust timing controller for a two-stroke cycle engine includes an exhaust timing control valve for changing a height of an open edge portion on a top dead center side of an exhaust port opening to an inside wall surface of a cylinder bore in the engine. The exhaust timing control valve moves axially of the cylinder bore by power from an actuator and the exhaust timing is accelerated in response to rotational frequency rises in the engine. The power of the actuator is transformed into an elevating stroke of the exhaust timing control valve by the eccentric motion of an eccentric cam. A slider mechanism for transferring an eccentric motion of the eccentric cam to the exhaust timing control valve is provided between the eccentric cam and the exhaust timing valve. A straightening member extends smoothly from a portion of the exhaust timing control valve, which retracts into the exhaust port, on the downstream side of the exhaust port.

Abstract: A combustion efficiency enhancing apparatus for liquid fuel dissolves/ionizes liquid fuel and divides it into particles with microwaves. The apparatus deoxidizes the incomplete combustion materials with a catalyst and again ionizes the liquid fuel. The fuel flow of the particles is promoted, and the liquid fuel is burnt with a contact surface to oxygen which is relatively larger, thereby accomplishing complete combustion, enhancing the combustion efficiency and minimizing exhaust gas so as to reduce pollution.

Abstract: An intake manifold for an internal combustion engine having a cylinder head is disclosed. The intake manifold includes at least one intake pipe with an intake flange for leak-free attachment of the manifold to the cylinder head by way of a sealing element. A bypass line is provided for feeding a secondary gas into the intake opening of the internal combustion engine. The secondary gas is fed into the bypass line through a connection, preferably a hose connection. The bypass line is formed by a groove in the intake flange which is open in the direction of the cylinder head and delimited on one side by the intake flange and on the other side by a sealing element. The connection is connected to one end of the groove, and the intake opening is connected to the other end of the groove.