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The fuel injector nozzle is the component that atomizes and sprays fuel into the combustion chamber. Its design and functionality directly affect fuel efficiency, combustion quality, and engine performance.

Common types include single-hole nozzles, multi-hole nozzles, spray-cone nozzles, fan-shaped nozzles, pintle nozzles, and split-injector nozzles, each designed to optimize fuel delivery for specific engine configurations.

Nozzle design influences the spray pattern, droplet size, and distribution of fuel, affecting how well the fuel mixes with air. Proper atomization leads to more efficient combustion, enhancing performance and reducing emissions.

Regular maintenance includes inspecting for clogs or leaks, ensuring proper spray patterns, and cleaning or replacing nozzles as necessary to maintain efficient fuel delivery.