Systems and methods regarding a ducted fuel injection (DFI) combustion system for an internal combustion engine can control an injection timing of a fuel injector to output fuel injections through at least one duct and into a combustion chamber of the internal combustion engine. The injection timing can include one or more pilot injections according to a predetermined range before top dead center (BTDC) for a combustion cycle; and a main injection into the combustion chamber for the combustion cycle after all of the one or more pilot injections. A first amount of the fuel injected for the main injection can be greater than a second amount of fuel injected for the one or more pilot injections. The predetermined range before top dead center (BTDC) of the one or more pilot injections can be from 85 to 40 degrees BTDC.

Methods and systems are provided for a fuel injector of an internal combustion engine. In one example, a fuel injector includes a body having a flange shaped to seat within a shoulder of a passage of a cylinder head. The shoulder is positioned at an inner side of the cylinder head such that the fuel injector is coupled to the cylinder head at the inner side by the flange.

A bearing sleeve for a holder, which is used for fastening a fuel distributor on an add-on structure, includes a first sleeve part and a second sleeve part. The first sleeve part has a rigid sleeve body and a damping element which is integrally connected to the sleeve body of the first sleeve part. The second sleeve part has a rigid sleeve body and a damping element which is integrally connected to the sleeve body of the second sleeve part.

A monolithic fuel delivery system for gasoline direct injection to an engine. The system has a common rail tube body from which injector sockets smoothly and seamlessly extend. Uninterrupted junctions are formed between the rail tube body and the injector sockets. The seamless junctions present a sealed relationship between the tube body and the injector sockets.

A fuel injector test machine is provided such that an injector is fixed on a test feature with a manually operable clamp.

In at least some implementations, an adapter, for a fuel pump having a casing, has a base having an axis and an opening through which fluid may flow, and multiple tabs connected to the base. The tabs are circumferentially spaced apart with a void between at least part of the tabs, and at least two tabs have a contact portion that extends radially inwardly to define a minimum diameter opening between the tabs. Each contact portion extends along a portion less than all of the surface areas of the radially inner surface of the tabs.

To provide an engine head structure for “omission or shortening a fuel pipe that withstands a high pressure”, “simplification or omission of a support bracket for a fuel accumulator and/or a fuel injection device”, “reduction of the number of parts” by devising a fuel accumulator and a support structure therefor, and the like. An engine head structure has a support bracket for mounting a fuel accumulator including a joining portion with a fuel injection device on a cylinder head, is disposed on a side of the fuel injection device or between adjacent fuel injection devices. The support bracket includes a member having a mounting portion on which the fuel accumulator is placed and mounted, a mounting leg portion extending from the mounting portion and mounted on the cylinder head, and an aligning leg portion extending from the mounting portion for positioning the support bracket with respect to the cylinder head.

A fuel injector testing machine is provided. The machine includes a head unit having a flow meter, and a fuel injector holding assembly. The head unit and/or the fuel injector holding assembly can be moved relative to each other, allowing the head unit to test a subset of fuel injectors held on the fuel injector holding assembly, and subsequently can test another subset of the fuel injectors via movement of the head unit and/or fuel injector holding assembly.

A bracket for clamping an injector onto a cylinder head of an internal combustion engine, comprising a clamp section, arranged for providing a clamping force onto the injector to clamp the injector onto the cylinder head; a mount section, extending from the clamp section and arranged for mounting the bracket to the cylinder head adjacent the injector; and a support section, extending from the mount section opposite the clamp section and arranged for supporting the bracket onto the cylinder head at a lever distance from the clamp section, to define the clamping force; wherein the support section comprises a plurality of support elements, each of said support elements arranged at a different lever distance, such that a selected support element from the plurality of support elements engages, in use, with the cylinder head at a selected lever distance, such that the bracket is supported on the selected support element only, to control a magnitude of the clamping force.

A bracket for clamping an injector onto a cylinder head of an internal combustion engine, comprising a clamp section, arranged for providing a clamping force onto the injector to clamp the injector onto the cylinder head; a mount section, extending from the clamp section and arranged for mounting the bracket to the cylinder head adjacent the injector; and a support section, extending from the mount section opposite the clamp section and arranged for supporting the bracket onto the cylinder head at a lever distance from the clamp section, to define the clamping force; wherein the support section comprises a plurality of support elements, each of said support elements arranged at a different lever distance, such that a selected support element from the plurality of support elements engages, in use, with the cylinder head at a selected lever distance, such that the bracket is supported on the selected support element only, to control a magnitude of the clamping force.