A fuel injection apparatus for a piston engine includes a fuel injector body in which an injector needle is provided, which injector needle is arranged to prevent or allow fuel injection flow from the injection apparatus based on the position of the injector needle. The position is effected by a pressurized control fluid so that by applying the pressurized control fluid the needle may be urged towards its closed position and by reducing the pressurized control fluid the needle may be allowed to move away from its closed position. The injection apparatus includes a flow path for the control fluid, wherein the flow path for the control fluid comprises a restriction section providing a restriction effect to the control fluid flow. The restriction section includes at least one temperature-effected member providing a temperature-dependent restriction effect.

In some embodiments, a fuel rail for a two-stroke internal combustion engine includes a fuel rail body, a fuel inlet component integrated within the fuel rail body as a one-piece component and in fluidic contact with a fuel line, one or more fuel exit ports in fluidic contact with a cylinder of a combustion engine, and one or more fasteners adapted to secure the fuel rail body to a cylinder wall of the cylinder of the combustion engine.

The present disclosure relates to internal combustion engines and the teachings may be applied to a roller for a roller plunger of a high pressure fuel pump, to a roller plunger which is equipped with a roller of this type, to a high pressure fuel pump which has said roller plunger, and/or to an internal combustion engine having a crankshaft which comprises the high pressure fuel pump. A roller for a roller plunger of a high pressure fuel pump may include a first roller region comprising a first material, a second roller region comprising a second material, the first material and the second material connected to one another in order to form a composite roller volume element, and the first material having a lighter density than the second material.

The invention relates to a method for producing a fuel injection element having channels, as well as to a fuel injection element. A fuel injection element according to the invention has helically extending channels and is produced with use of an extrusion tool.

The invention relates to a device for optimizing fuel combustion in combustion engines comprising a housing, a top cover having a grommet for connection with a fuel line, a bottom cover having a grommet for connection with a fuel line, a first ceramic element having a multitude of bores, at least one second ceramic element having a contorted through channel, and a magnetic zone with a multitude of magnetic elements and a multitude of spring colls, both arranged alternate and longitudinally.