What is a fuel injector?

Nozzle (also called


tip) is an integral part of the injector. Depending on the application, it may


be either "Pintal" or "multi-hole" design.

Early IDI (indirect


Injection) types of diesel and most gasoline engines have a pintal design, which


has an inverted conical tip at the end of the nozzle stem. It produces


conical shape of spray when spraying fuel. These nozzles are installed


either in the intake manifold (multiport) or in a "swirl chamber" in the head.


However, they are not installed by the nozzle directly into the combustion chamber.


camera.

The most common type


The injector used in the modern diesel engine is a multiple orifice design. This is the nozzle


installed directly in the combustion chamber, so they are under high pressure and


temperature environment. If the nozzle is installed concentrically in


the center of the cylinder, then the holes are all located in the same plane or


ring around the nozzle at an equal distance from each other. If the nozzle is installed at an angle,


then the holes can be in two different planes, at an angle, so that the resulting jet


the pattern is concentric in the piston. Multiple orifice nozzles may have different


the number and size of holes depending on the combustion chamber, engine size and required power.