What are the two types of injector nozzles used in IDI systems?

In Indirect Injection (IDI) systems, the two types of injector nozzles are indeed pintle and multi-orifice. Pintle nozzles have a pointed tip that allows for a fine atomization of the fuel when injected, which is crucial for efficient combustion and overall engine performance. This design helps to create a swirling motion in the combustion chamber, enhancing the mixing of fuel with the incoming air.

Multi-orifice nozzles, on the other hand, are designed with multiple openings that allow for the simultaneous injection of fuel through different paths. This increases the surface area of the injected fuel, improving atomization and combustion efficiency, as more spray patterns can provide better distribution within the combustion chamber.

Together, these two nozzle designs optimize fuel delivery and performance in IDI systems, supporting better engine efficiency and reduced emissions. The other options do not accurately reflect the types of nozzles used in IDI systems, as they refer to either other characteristics or designs that are not standard in the context of IDI.