Abstract: A cylinder head casting in a cylinder head assembly includes a coolant cavity upper surface and a coolant cavity lower surface forming a coolant cavity. The coolant cavity lower surface is contoured to form an igniter-support prominence and cast-in coolant channels through the igniter-support prominence to feed a flow of coolant through a cooling moat extending circumferentially around an igniter post supporting an igniter sleeve. The igniter sleeve abuts the cylinder head, radially outward of the igniter post, at a first contact location and a second contact location in an alternating arrangement with a first coolant feed opening and a second coolant feed opening. Related methodology relating to making a cylinder head is also disclosed.

Abstract: A method and apparatus are provided to reduce the overall weight of a rear differential cooling system of a motor vehicle. The apparatus includes a body panel system. That body panel system includes (a) a rear diffuser, having a front air inlet, (b) an underbody panel, overlying the rear diffuser as well as (c and d) first and second air tunnels formed between the rear diffuser and the underbody panel, and (e) a rear valance, including first and second vent openings for discharging air received from the first air tunnel. A heat exchanger is provided between the air tunnels and the vent openings. A related method for improving weight distribution and reducing overall weight of a rear differential cooling system is also provided.

Abstract: An air intake assembly includes a filter element and an intake conduit. The intake conduit includes a first end forming an inlet opening. The first end supports the filter element. The intake conduit also includes a second end forming an outlet opening and being adapted for attachment to an internal combustion engine. The intake conduit further includes a body defining a central axis extending between the first and second ends. A first lateral dimension of the body is taken transverse to the central axis, adjacent the inlet opening, within a plane that intersects both the inlet and outlet openings. A second lateral dimension of the body is taken transverse to the central axis, adjacent the outlet opening, within the plane. The first lateral dimension is less than the second lateral dimension.

Abstract: An intercooler air-guide of dual duct type for improving crash performance guiding head wind toward an intercooler may include a guide frame including a first opening portion and a second opening portion, and a guide portion coupled to the guide frame to improve crash performance of the intercooler air-guide of dual duct type.

Abstract: A motor vehicle has a supercharged internal combustion engine arranged at the rear and can be fed cooled combustion air via a charge air cooler (7). The charge air cooler (7) is positioned above the internal combustion engine below a covering hood (4) for the internal combustion engine. The charge air (BEIN) is fed via at least one charge air inlet opening in a charge air inlet shaft (8) that adjoins the covering hood (4) and is discharged via at least one charge air outlet shaft (BAUS) that is connected to outlet openings (13, 14) in the region of a license plate recess (9) of the motor vehicle.

Abstract: An engine room cooling system may include an encapsulation covering an intake manifold and an exhaust manifold of an engine of a vehicle, a main duct guiding traveling wind flowing into the vehicle to a side of the encapsulation, an encapsulation intake duct branched from the main duct and formed toward the intake manifold within the encapsulation, an encapsulation exhaust duct branched from the main duct and formed toward the exhaust manifold within the encapsulation, and an intake duct valve disposed adjacent to the encapsulation intake duct and controlling air flow from the main duct to the encapsulation intake duct or to the encapsulation exhaust duct.

Abstract: An exhaust gas re-induction apparatus includes conduits and an outer housing, which receive exhaust gas from an exhaust system of an engine, and passively recirculate a portion of the gas to an air inlet of the engine while transferring another portion of the gas through orifices in the apparatus and via a return conduit to the exhaust manifold. An exchange of heat occurs between the exhaust gas, the various components and chambers of the re-induction apparatus, and the environment. Fuel efficiency is increased and harmful toxins and emissions are reduced. A system includes the re-induction apparatus and a recirculation conduit, which connects the re-induction apparatus to the air inlet of the engine before the vacuum, via a water separator or soot filter device depending on engine type. The amount of exhaust gas recirculated can essentially depend on the operating speed of the engine and the size dimensions of the apparatus.

Abstract: A four-cycle air-oil cooled engine includes a cylinder head having a spark plug mounting hole formed therein, and a ring-like groove formed therein and surrounding the spark plug mounting hole. The cylinder head is formed with first and second co-planar sealing surfaces, disposed on a plane perpendicular to an axis of the spark plug mounting hole, and having an opening end of the ring-like groove disposed therebetween. The ring-like groove defines an oil jacket around the periphery of the spark plug mounting hole. A cover member having a flat surface opposed to the first and second flat sealing surfaces of the cylinder head is secured to the cylinder head such that a single gasket is interposed between the first and second sealing surfaces and the flat surface of the cover member.

Abstract: A cooling air conduit for motorcycle engine which is particularly suitable for V-twin cylinders is provided which is constructed of a conduit body of elongated, tapered shape formed by a top panel, a bottom panel and two side panels such that a cool air passageway is formed inbetween the panels to direct cool air, away from the first cylinder, and onto the second or rear cylinder for efficient cooling.

Abstract: There is provided an air-cooled engine (10) that is cooled by cooling air. The air-cooled engine (10) comprises a cylinder block (33), and a cylinder head (28) that closes off one end of a cylinder (26). The cylinder head (28) includes a base part (81) that is superposed on and secured to the cylinder block (33) by a plurality of bolts (91), and a valve compartment (83) formed integrally on the base part (81). All of the bolts (91) are disposed near the outer periphery of the base part (81) at positions outside of the valve compartment (83).

Abstract: A connection between an expansion chamber outlet and a rubber cuff that accommodates an inlet portion of a throttle body exhibits a dovetail connection between an expansion chamber wall and the rubber cuff such that the expansion chamber has a dovetail recession while the rubber cuff has a dovetail projection. The rubber cuff is insert molded around the expansion chamber outlet such that the joined interface between the rubber cuff and the expansion chamber is from the molding. The dovetail prevents separation due to air forces through the chamber and cuff. A cuff groove opposite the dovetail projection, on a cuff inside diameter, receives a protuberance of the throttle body inlet portion. A band clamp fits around the outside diameter of the cuff, adjacent the throttle body inlet protuberance, to prevent movement of the throttle body. The cuff has a projection(s) to also prevent slippage of the throttle body.

Abstract: The present invention provides an intake port design that provides a low thermal inertia characteristic, thereby decoupling the surface temperature of the intake port walls from that of the coolant through use of an air gap formed between the intake port and the cylinder head. At idle and part-throttle, the intake port is at a higher surface temperature yielding better cold-start emissions, better mixture preparation, and less dense intake charge (“thermal throttling”) for better fuel economy. At wide-open-throttle, the intake port is at a lower surface temperature yielding better volumetric efficiency for improved torque and reduction in knocking tendency enabling higher compression ratio for improved fuel economy and performance. The intake port design of the present invention can be manufactured with a hydroform manufacturing process resulting in improved dimensional consistency and smooth surface finish. Additionally, the process eliminates some cylinder head machining processes.

Abstract: To increase the wind volume of the cooling wind flowing through a radiator and to enhance the cooling performance of the radiator by providing a wind exhaust duct using a crankcase of an internal combustion engine. A cooling device of the internal combustion engine includes a radiator arranged lateral to crankcases. A wind exhaust duct exhausts the cooling wind passed through the radiator to the atmosphere. The wind exhaust duct is extends along a rotational axis of the crankshaft at the upper portion of the crankcases and the upper portion of the transmission case.

Abstract: A soundproof engine-driven operating machine has a small installation area, is easy to assemble and disassemble, and has superior cooling effects. The soundproof engine-driven operating machine includes an engine, an operating machine main body that is driven by the engine, a base frame that supports the engine and the operating machine main body in a vibration-proof structure, and a case fitted to the base frame and accommodating the engine and the operating machine main body. One part of the case includes a first-story chamber accommodating the engine and the operating machine main body, first and second heat exchangers, each having a cooling fan and being arranged above the first-story chamber, the first and second heat exchangers performing heat conversion relating to the operation of the engine by using the cooling fans, arranged separately in a ventilation path, and a second-story chamber accommodating a muffler for discharging engine air.

Abstract: A construction machine of the present invention is provided, in a compartment formed by a cover, with an engine, a centrifugal fan, and a heat exchanger for exchanging heat between cooling air blown by the centrifugal fan and a specified medium, wherein the centrifugal fan and the heat exchanger are arranged further upstream than the engine with respect to flow of cooling air, so that cooling air sucked in by the centrifugal fan is led to the engine after passing through the heat exchanger.

Abstract: A straddle type four-wheeled all-terrain vehicle includes: an engine mounted on a body frame and disposed between front wheels and rear wheels, having a crankcase; a variable-speed V-belt drive disposed on a side of the crankcase and covered with a V-belt drive cover, the V-belt drive cover having an upper wall provided with a cooling air discharge port opening upward; and a cooling air exhaust duct disposed within a right-and-left width of the body frame. The cooling air exhaust duct communicates with the cooling air discharge port and has an air outlet located in front of a seat so that a cooling air is discharged through the air outlet into a space under the seat. Cooling air is discharged through the air outlet of the cooling air exhaust duct into a space under the seat.