Abstract: A heavy duty piston for an internal combustion engine comprises a thermally conductive composition filling 10 to 90 vol. % of a sealed cooling gallery. The thermally conductive composition includes bismuth and/or tin. For example, the thermally conductive composition can be a single-phase binary mixture of bismuth and tin. The thermally conductive composition has improved thermal properties, for example a melting point around 139° C., a thermal conductivity around 22 W/m·K, and a thermal diffusivity around 1.43E-5 m2/s. The thermally conductive composition is not reactive and does not include toxic or cost-prohibitive metals. During high temperature operation, as the piston reciprocates in the cylinder bore, the thermally conductive composition flows throughout the cooling gallery to dissipate heat away from the upper crown and thus improve efficiency of the engine.

Abstract: An internal combustion engine with coolant jackets is provided. The internal combustion engine includes a cylinder head coupled to a cylinder block to form a first cylinder, an upper head-associated coolant jacket including a coolant conduit traversing the cylinder head, a lower head-associated coolant jacket fluidly separated from the upper cylinder head coolant jacket and including a coolant conduit traversing the cylinder head vertically below the upper head-associated coolant jacket, and a block-associated coolant jacket including, a first coolant passage having an inlet in fluidic communication with a coolant pump outlet and an outlet in fluidic communication with an inlet of the lower head-associated coolant jacket, and a second coolant passage having an inlet in fluidic communication with an outlet of the lower head-associated coolant jacket and an outlet in fluidic communication with a heat exchanger.

Abstract: A first coolant flow passage (31, 32) is provided to extend in a longitudinal direction of a cylinder head (101). In at least one of cross sections perpendicular to the longitudinal direction, the first coolant flow passage (31, 32) is located between a flat plane (S1) including central axes of a plurality of combustion chambers (4) and parallel to the longitudinal direction and a central line plane (S2) including central lines of a plurality of intake ports (2). In at least one of cross sections perpendicular to the longitudinal direction, at least a portion (20c) of a second coolant flow passage is located between a cylinder block mating surface (la) of the cylinder head (101) and the intake port central line plane (S2). A coolant at a temperature lower than that of a coolant flowing in the second coolant flow passage (20c) flows in the first coolant flow passage (31, 32).

Abstract: A turbofan engine assembly including a compressor, an intermittent internal combustion engine having an inlet in fluid communication with an outlet of the compressor through at least one first passage of an intercooler, a turbine having an inlet in fluid communication with an outlet of the intermittent internal combustion engine, the turbine compounded with the intermittent internal combustion engine, a bypass duct surrounding the intermittent internal combustion engine, compressor and turbine, and a fan configured to propel air through the bypass duct and through an inlet of the compressor, wherein the intercooler is located in the bypass duct, the intercooler having at least one second passage in heat exchange relationship with the at least one first passage, the at least one second passage in fluid communication with the bypass duct.

Abstract: An engine of a straddle-type vehicle includes a seal between a surrounding wall and a pipe. A cylinder head includes a first surrounding wall portion and a second surrounding wall portion. One end of the pipe is pressed in against the first surrounding wall portion. The second surrounding wall portion is located more distant from an attachment portion than the first surrounding wall portion is, and has an inner diameter larger than that of the first surrounding wall portion. The pipe includes an annular projection. The annular projection projects from the outer periphery of the pipe, and divides a space defined by the outer periphery of the pipe and the inner periphery of the second surrounding wall portion into subspaces arranged in an axial direction of the pipe when the one end of the pipe is pressed in against the first surrounding wall portion.

Abstract: A laser ignition device for an internal combustion engine, in which the laser ignition device has at least one laser spark plug and a cooling device for temperature control, in particular cooling, of the laser spark plug. The cooling device has a cooling circuit, containing a coolant, which is thermally connectable to at least one component of the laser spark plug, a volume of the coolant contained in the cooling circuit being less than or equal to approximately 50% of a compression volume of a cylinder of the internal combustion engine, which may be less than or equal to approximately 10% of a compression volume of the cylinder of the internal combustion engine.

Abstract: Air/fuel mixture is received from a combustion chamber of the internal combustion engine into an enclosure about a flame kernel initiation gap between a first ignition body and a second ignition body. Air/fuel mixture received into the enclosure is directed into a flame kernel initiation gap. The mixture is then ignited in the flame kernel initiation gap.

Abstract: A laser spark plug is described, in particular for an internal combustion engine of a motor vehicle, having a combustion chamber window situated in an end area facing the combustion chamber. Arrangement is provided for cooling a volume region present in the area of the combustion chamber window and/or a medium present in the volume region. The cooling arrangement has a cooling body which has material having a relatively great thermal conductivity, in particular having a thermal conductivity of approximately 90 Watts per Kelvin and meter at room temperature or more. The cooling body is designed essentially annularly. An inner diameter of the cooling body in the area of a front side facing the combustion chamber of the cooling body is smaller than an inner diameter of the cooling body in the area of a front side of the cooling body facing away from the combustion chamber.

Abstract: An ignition plug cooling device of a vehicle engine for efficiently cooling the ignition plugs while increasing the freedom in the arrangement of the ignition plugs. A vehicle engine includes a first ignition plug and a second ignition plug for making respective electrodes thereof face a combustion chamber and are mounted on a cylinder head. An air flow passage through which a flow of air passes and a cooling oil chamber through which lubrication oil for the engine passes are formed in the cylinder head. The first ignition plug is arranged in the air flow passage to enable a cooling of the first ignition plug by the flow of air which passes through the air flow passage. The second ignition plug is arranged adjacent to the cooling oil chamber to enable a cooling of an area around the second ignition plug by oil which passes through the cooling oil chamber.

Abstract: The invention relates to a laser spark plug (100), in particular for an internal combustion engine of a motor vehicle, having a combustion chamber window (120) situated in an end area (100a) facing the combustion chamber. According to the invention, arrangement (130) are provided for cooling a volume region (210) present in the area of the combustion chamber window (120) and/or a medium present in the volume region (210). The cooling arrangement (130) have a cooling body which has material having a relatively great thermal conductivity, in particular having a thermal conductivity of approximately 90 Watts per Kelvin and meter at room temperature or more. The cooling body (131) is designed essentially annularly. An inner diameter (D1) of the cooling body (131) in the area of a front side (131a) facing the combustion chamber of the cooling body (131) is smaller than an inner diameter (D2) of the cooling body (131) in the area of a front side of the cooling body (131) facing away from the combustion chamber.

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 method is provided for controlling one or more glowplugs in a compression-ignition engine. The controlling of the glowplug involves the prediction of a glow plug temperature to control a power supply to the glowplug. A supplied power to a glowplug and a combustion chamber temperature is determined. A temperature of the glowplug is predicted and the predicted glowplug temperature is used to control a power supply to the glowplug. The predicted glowplug temperature is derived from a numerical solution of a differential equation for the glowplug temperature. The differential equation is nonlinear in the glowplug temperature.

Abstract: In a direct injection internal combustion engine, a fuel injection valve and a spark plug of adjacent cylinders are inclined at different angles from each other in directions perpendicular to a cylinder arrangement direction in which the cylinders are arranged. Besides, the fuel injection valve and the spark plug of at least one of the cylinders are inclined at different angles from each other in directions parallel to the cylinder arrangement direction. A cooling channel is provided between the fuel injection valve and the spark plug of the at least one of the cylinders.

Abstract: A fixing sleeve (2) for a spark plug (1) comprising coolant passages (3) which are arranged in the wall of the fixing sleeve (2) and which are oriented substantially in the longitudinal direction of the spark plug, wherein the fixing sleeve (2) comprises a metallic material whose thermal conductivity is over 60 W/m° C., preferably over 80 W/m° C.