Abstract: An engine includes a combustion chamber, and a cylinder head. The cylinder head has an intake port communicating with the combustion chamber. The intake port includes a first inner wall and a second inner wall as inner walls that are provided from an upstream side to a downstream side. A valve guide hole opens onto the first inner wall. The second inner wall faces the first inner wall. The first inner wall includes a first concavely curved surface configured to vary a flowing direction of intake air. The second inner wall includes a second concavely curved surface configured to vary the flowing direction of the intake air.

Abstract: An internal-combustion engine includes: a direct fuel injector directly injecting fuel into a combustion chamber; and a control device. The control device performs: presumption processing that presumes, based on an operating condition of the internal-combustion engine, that a thermoplastic deposit is formed on an injection hole portion of the direct fuel injector; temperature control processing that increases a temperature of the injection hole portion when the thermoplastic deposit is presumed to be formed; and first removal processing that injects the fuel from the direct fuel injector after the temperature control processing.

Abstract: A fuel injection valve includes a valve body and a valve member. The fuel injection valve is configured to control fuel supply by a movement of the valve member relative to the valve body. A slit that is configured to inject fuel having a first end portion opened in a sack portion of the valve body and a second end portion opened at an outer wall of the valve body is formed in the valve body. A through hole having a first end portion opened in the sack portion and a second end portion opened at the outer wall of the valve body is formed in the valve body.

Abstract: A fuel injection valve includes a valve body and a valve member. The fuel injection valve is configured to control fuel supply by a movement of the valve member relative to the valve body. A slit that is configured to inject fuel having a first end portion opened in a sack portion of the valve body and a second end portion opened at an outer wall of the valve body is formed in the valve body. A through hole having a first end portion opened in the sack portion and a second end portion opened at the outer wall of the valve body is formed in the valve body.

Abstract: A variable ratio throttle control is disclosed for an off road utility vehicle. The variable ratio throttle control includes a butterfly throttle on a throttle shaft pivotably mounted to a throttle body, a bell crank on the throttle shaft, and a lever extension extending radially from the bell crank to provide an extended lever arm until the butterfly throttle is partially open. A throttle cable is connected between an accelerator pedal and the lever extension, the throttle cable being displaceable by depressing the accelerator pedal to turn the extended lever arm. The lever extension abuts a kick plate once the butterfly throttle is partially open. The butterfly throttle may be fully opened by displacing the throttle cable to turn the bell crank after the lever extension abuts the kick plate.

Abstract: In line carburetor (104) is mounted to a manifold (140) over the engine (800). The barrels of the carburetor deliver air/fuel suspensions to concentrated positions (152) of the manifold, with the concentrated positions being at opposite ends of the engine. The ports leading from the manifold to the runners are equally positioned about the concentrated positions (152) so that the runners are of substantially equal length and resistance, thereby providing more uniform delivery of the air/fuel suspension to the cylinders.

Abstract: A speed control system is for a vehicle having an engine including a carburetor with a throttle plate moveable between a minimum open position and a maximum open position. The speed control system includes a ground speed limiter mechanism operatively coupled with the throttle plate and configured to displace the plate toward the minimum position as ground speed of the vehicle approaches a predetermined maximum value. An engine speed limiter mechanism is operatively coupled with the throttle plate and is configured to displace the plate toward the minimum position as a speed of the engine approaches a predetermined maximum value. Preferably, a control linkage is connected with the throttle plate and is moveable between a first configuration, at which the throttle plate is disposed at the minimum position, and a second configuration at which the throttle plate is disposed at the maximum position, the two limiter mechanisms displacing the linkage.

Abstract: An internal combustion engine having a crankcase, a cylinder connected to the crankcase, a compressed air assisted fuel injection system connected between the crankcase and the cylinder, and a reciprocating piston head located in the cylinder. The improvement comprises a fuel delivery system having two carburetor sections with two interconnected rotatable shafts.

Abstract: A gasoline direct injection engine is provided with a bypass air supply line. The bypass line is selectively opened to allow additional flow of air into the engine chamber during a transition phase. Air normally flows through a main air supply line through a plenum. However, during a transition from a low air volume early injection phase to a relatively high air volume late injection phase the valve is opened to provide additional flow through the bypass. In this way, the air can be more quickly delivered to the engine chamber.

Abstract: The present invention relates to a dual throttle valve of a car which includes an intake pipe divided into a primary intake path for low speed and a secondary intake path for middle or high speed, a primary throttle valve, a secondary throttle valve, a pinion, a fan-shaped gear, and a semi-circular member, wherein at a low speed, only the primary throttle valve rotates to open the primary intake path having a smaller diameter than the secondary intake path and at a middle or high speed, the primary and secondary throttle valves rotate sequentially to open the primary and secondary intake paths gradually even when the sudden accelerating for starting or outrunning occurs, so that waste of fuel at a low speed due to the sudden oversupply of gas and the occurrence of harmful exhaust gas due to the incomplete combustion at a middle or high speed can be prevented by controlling the amount of the intake gas.

Abstract: A number of embodiments of induction system arrangements for a two cycle crankcase compression internal combustion engine having reed valve assemblies comprised of a mounting portion that defines a flow passage and a first caging member that divides the flow passage into first and second sections. A second caging member is affixed to the first caging member and the means which affixes it also affix a first reed valve for valving a valved opening in the first caging member. The valved openings in the caging members are generally rectangular in configuration and have a cross-sectional flow area approximately equal to the cross-sectional flow area of the intake passage in which the reed valve assembly is positioned. At least a pair of generally circular induction passages serve each reed valve member and a variety of different types of throttle valve arrangements and injection patterns are disclosed.

Abstract: A fuel injection apparatus for an internal combustion engine comprising: a nozzle body; a nozzle formed at the bottom of the nozzle body; an electroexpansive actuator having the electroexpansive effect; a valve member, slideably mounted within the nozzle body; and a fuel chamber formed between the electroexpansive actuator and the valve member. When the electroexpansive actuator expands to reduce the volume of the fuel chamber, the valve member is moved in the closed direction of the nozzle. When the electroexpansive actuator contracts to increase the volume of the fuel chamber, the valve member is moved in the open direction of the nozzle.

Abstract: Several embodiments of improved compact motorcycle configurations. In each embodiment, a single suspension element is provided for the rear wheel that extends generally in the longitudinal center plane of the motorcycle. In accordance with each embodiment, plural intake passages serve each chamber of the engine to permit the use of a smaller more compact induction system. Separate carburetor barrels serve each intake passage. In one embodiment, the intake passages communicate with the chamber through separate intake ports and in another embodiment, the intake passages serve the chamber through a common intake port.

Abstract: A carburetor actuating system for two carburetors (5a, 5b) in V-shaped space (4) between two cylinders (2a, 2b) of a V-engine such that drafting directions of the respective carburetors are opposite to each other. One carburetor (5b) is controlled by a cable (16b) attached to an actuating arm (15b) connected to the valve stem (14b) protruding to the outside of the one carburetor (5b), i.e., in a direction away from the carburetor. The other carburetor (5a) is controlled by a driven arm (21a) connected to the valve stem (14a) protruding toward the carburetor (5b). The driven arm is actuated by a drive arm (21b) connected to the valve stem of the one carburetor (5a) through links (22a, 22b) hinged by a pin (24) constrained by a guide groove (28) to motion along a perpendicular bisector of a line passing through the axes of the valve stems (14a, 14b).

Abstract: A carburetor for a multi-cylinder internal combustion engine which has for each cylinder a main combustion chamber defined above the piston in the cylinder and a sub-combustion chamber defined above the main combustion chamber and communicating with the latter through a torch nozzle. The carburetor has a main intake passage and a sub-intake passage for supplying a comparatively lean mixture and a comparatively rich mixture to the main and sub-combustion chambers respectively. The carburetor has a single throttle valve shaft extending across the main and sub-intake passages with a main throttle valve and a sub-throttle valve mounted on the valve shaft and disposed in the main and sub-intake passages respectively.The main and sub-throttle valves are attached to the single throttle valve shaft at the same attaching angle and have respective parallel surfaces and outer peripheral edge surface.

Abstract: A carburetor for a multi-cylinder internal combustion engine which has for each cylinder a main combustion chamber defined above the piston in the cylinder and a sub-combustion chamber defined above the main combustion chamber and communicating with the latter through a torch nozzle. The carburetor has a main intake passage and a sub-intake passage for supplying a comparatively lean mixture and a comparatively rich mixture to the main and sub-combustion chambers respectively. The carburetor has a single throttle valve shaft extending across the main and sub-intake passages with a main throttle valve and a sub-throttle valve mounted on the valve shaft and disposed in the main and sub-intake passages respectively. One of the main and sub-throttle valves has an outside diameter smaller than the inside diameter of the associated intake passage so that the ratio of the open areas of the main and sub-intake passages is not constant as the throttle shaft is operated.

Abstract: An induction system for a multi-cylinder internal combustion engine that improves fuel efficiency and reduces the emission of unwanted exhaust gas constituents, particularly at the low and medium load conditions. The engine induction system comprises a plurality of separate carburetor barrels which, at least under some running conditions, serve cylinders separately from each other through main induction passages. One carburetor barrel is provided with a different fuel discharge system than the other carburetor barrels for accomodating a certain engine operating condition. A separate sub-intake system connects this carburetor barrel with other cylinders not normally served by the particular carburetor barrel in question. This sub-intake system has a substantially smaller cross-sectional area in the main intake system so that the charge drawn into the cylinders through the sub-intake system enters at a substantially higher velocity.