The original Cummins N14 featured a gear driven, mechanical injection pump and camshaft fired unit injectors. The system was know as the "PT" injection system, short for Pressure-Time. Chasing Detroit's popular 60 Series platform, specifically it's electronically controlled injection system, Cummins introduced the N14 "Celect" in 1990 (Cummins Electronic Engine Control). The N14 Celect relies on electronically controlled, camshaft driven unit injectors. In the system, the camshaft provides final fuel pressure in each individual fuel injector but the injectors utilize electronic solenoids that are actuated by the ECM. The result is greater timing, pulse width, and pressure control. For 1997 Cummins introduced the N14 "Celect Plus", which essentially features a more sophisticated ECM and injection management system.
Cummins N14 Engine Specs
| Manufacturer | Cummins Inc. | |
| Applications | 1987 - 2001 class 7/8 on-highway trucks | |
| Engine Type | 4 cycle turbodiesel | |
| Configuration | Inline 6 cylinder | |
| Displacement | 855 CID, 14.0 liters | |
| Firing Order | 1 - 5 -3 - 6 -2 - 4 | |
| Engine Block | Cast iron, wet cylinder liners | |
| Cylinder Head | Cast iron | |
| Compression Ratio | 14.0 to 17.0:1 | |
| Cylinder Bore | 5.5 inches (140 mm) | |
| Cylinder Stroke | 6.0 inches (152 mm) | |
| Valvetrain | Overhead valve (OHV), 4 valves per cylinder | |
| Injection | 1987 - 1989 | Mechanical injection pump, camshaft controlled mechanical unit injectors, pressure-time (PT) injection system |
| 1990 - 1996 | Cummins Celect electronically controlled injected system, electronically actuated unit injectors | |
| 1997 - 2001 | Celect Plus electronically controlled injection system (more sophisticated ECM, diagnostic features than previous Celect system) | |
| Aspiration | Holset turbocharger, air-to-air intercooler (charge air cooler) | |
| Engine Dimensions (approx.) | Length | 59 inches |
| Width | 37 inches | |
| Height | 51 inches | |
| Engine Weight (approx) | 2,550 to 2,625 lbs dry | 2,650 to 2,750 lbs wet | |
| Min Oil Pressure | 10 psi @ low idle 35 - 45 psi @ governed speed, no load |
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| Engine Oil Capacity | 11.0 U.S. gallons (common for applications w/ bypass filter, oil capacity may vary) | |
| Horsepower | 310 - 525 hp @ 1,800 - 2,100 rpm | |
| Torque | 1,250 - 1,850 lb-ft @ 1,200 rpm | |
| Max Engine Speed | 2,100 rpm | |