Internals of an Fuel Injector

This page is to show you the inside workings of a fuel injector. The animated picture (Thank you Wikipidea!) is an excellent animation of what exactly happens when fuel is pressurized behind the injector and an electrical pulse is added to the coil windings.

Ball & Disc Style Injectors

This next picture will show the internals of a Ball & Disc style injector. These injector do not have a pintle, but rather a ball that acts in a similar manner to a pintle by raising and lowering. The injector’s disc is what determines the spray pattern. On a pintle injector, the pintle itself is what dictates the spray pattern. Although the Rochester injectors (as stated next to the picture) are less prone to clogging, these injectors are more prone to other types of failure such as coil windings breaking down.