Singlejet

Singlejet refers to a type of fuel injector used in internal combustion engines, particularly in older or simpler carburetor-based systems. It is characterized by having a single nozzle that atomizes and sprays fuel into the intake manifold or directly into the combustion chamber. This contrasts with multi-point injection systems, which use multiple injectors, each assigned to a specific cylinder. In a single-point injection (SPI) system, a single injector is mounted centrally, often on or near the throttle body. When the throttle is opened, the injector sprays fuel, which is then drawn into the cylinders along with the incoming air. This method of fuel delivery is generally less precise than multi-point injection, as the fuel distribution to each cylinder can be uneven. Singlejet systems were an improvement over carburetors in terms of fuel efficiency and emissions control, but have largely been superseded by more advanced injection technologies in modern vehicles due to their limitations in precise fuel metering and performance optimization. While less common in new passenger car engines, the fundamental concept of a single fuel injection point can still be found in some specialized applications or simpler engine designs.