Fuel Injection for 1994-1998 Dodge Ram Cummins Diesel 12 Valve

Shop the best 12v Cummins fuel injection components available for your 2nd gen Cummins diesel. We carry a variety of hole configurations, nozzle types, and sizes, and more to meet your power goals and driving style. Shop now for low prices and fast shipping.

5-hole vs. 6-hole vs. 7 hole Injectors

You may be wondering what the difference is between all of the injector sizes/hole counts and surfing the internet to find the answer can often lead to more confusion. We’re here to shed some light on the matter.

Per a given flow amount, an injector with a smaller hole count and larger orifice size will penetrate deeper into the piston bowl. Depending on the rpm for the application, this could be an advantage or a drawback. An injector of the same flow with a larger hole count and smaller orifice size will produce a finer spray and penetrate less deeply into the bowl, meaning that it will burn sooner at lower rpm/boost levels.

The real world effects of this seem to come in the form of burn efficiency at a given rpm. At low rpm, the 7-hole better disperses fuel into the air charge which results in increased burn efficiency (more power). There is a cross-over point around 2000rpm where the deeper penetration of the 5-hole injector results in better fuel dispersion into the increasingly turbulent air charge, enabling a more complete burn which results in more power. While apparent, these differences are minimal until 3000rpm. The 5-hole style injector is by far the most common and is the best choice for most applications.