🚗What is a Fuel Injector Spray Pattern?

A spray pattern is the shape and angle at which fuel is sprayed from the injector nozzle into the combustion chamber or intake port. The goal is to atomize the fuel — breaking it into fine droplets — to mix evenly with air for clean, powerful combustion.

🚀 Types of Fuel Injector Spray Patterns
1. Single Hole / Jet Spray
• 💨 Narrow, focused stream.
• ✅ Common in older engines.
• ❌ Less effective atomization.
2. Multi-Hole Spray (2, 4, 6, or more)
• 💦 Multiple small jets spray in a cone or fan shape.
• ✅ Better atomization, precise distribution.
• 👍 Common in modern fuel-injected engines.
3. Cone-Shaped Spray
• 🔺 Uniform circular spray cone.
• ✅ Great for central injection into intake manifolds.
• Ensures even air-fuel mixture.
4. Fan Spray
• 🌬️ Wide flat pattern.
• ✅ Best for engines with wide intake ports.
• Promotes better coverage of the intake valve.
5. Dual Cone Spray
• ⏸️ Two opposing spray cones.
• ✅ Enhanced atomization and better cold-start performance.
6. Wall-Guided or Spray-Guided
• Designed to interact with intake port walls or directly aim at spark plug area (common in GDI engines).
• ✅ High-efficiency combustion, lower emissions.

🎯 Why Spray Pattern Matters
• ✅ Better Atomization = More complete combustion.
• ✅ Less Fuel Wasted = Improved fuel economy.
• ✅ Lower Emissions = Cleaner engine.
• ✅ Smooth Idle and Throttle Response

⚙️ Controlled by:
• Injector design (nozzle holes, angle, pressure)
• ECU programming (timing and duration of injection)
🔧🚗