🔍 Key Concepts

• Fuel injector nozzle types (hole, multi-hole, pintle, multi-pintle) and how fuel leaves each nozzle • The relationship between spray pattern, droplet size, and carbon deposits in diesel engines • How self‑cleaning action at the orifice depends on needle/seat design

💭 Think About

• Think about which nozzle design produces the finest, most evenly distributed spray for good combustion, reducing unburned fuel that can form carbon deposits. • Consider which nozzle designs have a projecting pintle or needle that helps sweep or keep the orifice area clear as it opens and closes. • Ask yourself: which type is most commonly used on high-speed diesel engines specifically to improve atomization and reduce nozzle fouling?

✅ Before You Answer

• Verify which nozzle types have a single vs multiple discharge outlets and how that affects deposit build-up. • Check which design is described in your text as having a self-cleaning or scouring action at the orifice. • Confirm which nozzle type is recommended where minimum carbon deposit and good cold starting are desired.