Carbon deposit build up on the injection nozzle orifice is least likely to occur with which type of fuel injector nozzle?

The pintle type fuel injector nozzle is designed to have a more significant fuel spray pattern and better atomization capabilities, which helps to promote complete combustion of the fuel in the engine. Because of this efficient combustion process, there is less unburned fuel and soot produced, leading to a reduced buildup of carbon deposits on the nozzle orifice compared to other nozzle types.

Pintle nozzles are particularly effective in achieving higher fuel velocities and a fine mist, which further facilitates the evaporation of fuel and combustion efficiency. These characteristics contribute to maintaining a cleaner nozzle over time, minimizing the likelihood of carbon accumulation.

In contrast, other types of nozzles may create different spray patterns or combustion efficiencies that can result in more incomplete combustion, leading to increased carbon deposits. Therefore, the pintle nozzle stands out as the option that is least likely to have carbon buildup issues.