The Cummins 855 and the Cummins N14 are closely related engines, but they are not exactly the same. The N14 is actually an evolution of the 855 series, designed to offer improved performance, fuel efficiency, and emissions control while keeping the strong mechanical foundation that made the 855 so reliable.
The Cummins 855—often referred to as the NT855—was first introduced in the 1960s as part of Cummins’ famous “N Series.” It is a 14-liter (855 cubic inches) inline six-cylinder engine known for its mechanical simplicity and outstanding durability. The NT855 relies on a mechanical fuel injection system, which makes it easy to service and repair, especially in remote or industrial environments.
The N14, introduced in the early 1990s, shares the same displacement and basic block design as the 855 but incorporates electronic controls under the CELECT (Cummins Electronic Control) system. This upgrade allowed for better fuel management, reduced emissions, and more precise performance tuning. The N14 became a preferred choice in highway trucks and heavy-duty equipment during the 1990s and early 2000s.
In short, the N14 is the modernized, electronically controlled successor of the 855. While the two engines share a similar architecture and size, they differ in technology and operation—the 855 is purely mechanical, whereas the N14 is electronically managed.
Both engines are celebrated for their long lifespan and dependability. The 855 remains popular in older industrial and marine applications, while the N14 continues to be valued in trucking and power generation for its blend of classic strength and modern control.