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A pencil injector, also known as a pintle injector or single-hole injector, is a type of fuel injector used in some diesel engines. It is named for its pencil-like shape and typically features a single fuel delivery hole at the end, hence the term "single-hole injector."
The design of a pencil injector is relatively simple compared to other fuel injection systems. It consists of a nozzle with a pintle valve, which is a needle-like valve that controls the flow of fuel through the injector. When the injector is energized, the pintle valve lifts, allowing pressurized fuel to spray through the single hole at the tip of the injector.
Pencil injectors are commonly found in older diesel engines and are known for their robustness and simplicity. They are often used in applications where precise fuel control and advanced fuel atomization are not as critical as in modern common rail or unit injector systems. Pencil injectors tend to have larger droplet sizes and may not provide as fine control over fuel delivery.