The 4th generation 6.7L Cummins engine played a pivotal role in the evolution of Ram HD trucks. This article delves into the key specifications, performance data, and the engine’s journey from 2010 to 2018.
4th Generation Cummins Overview
The 6.7L Cummins engine made its debut during the 3rd generation of Ram HD trucks (2007.5-2009), enhancing power and ensuring compliance with stringent emissions standards. In 2010, the 4th generation Cummins was introduced, bringing a wave of innovations to the Ram HD lineup.
- Quad cab trucks were replaced by full-size crew cabs;
- Mega Cab models were retained;
- Additional trims enhanced interior luxury;
- Improved transmissions, including the 68 RFE and Aisin, offered diverse performance options.
Engine Specifications
The 4th generation 6.7L Cummins engine boasted the following specifications:
| Specification | Details |
|---|---|
| Engine Design | Inline 6 Cylinder |
| Block | Cast Iron |
| Cylinder Head | Cast Iron |
| Displacement | 6.7 Liters or 408 Cubic Inches |
| Bore | 4.21″ (106.9 mm) |
| Stroke | 4.88″ (124 mm) |
| Compression Ratio | 17.3:1 |
| Firing Order | 1-5-3-6-2-4 |
| Fuel Injection | Bosch CP3 High Pressure Common Rail System (29,000 PSI) |
| Turbocharger | Holset HE351VE Variable Geometry Turbocharger (VGT) |
| Valvetrain | Overhead Valve Engine (OHV), 4 Valves Per Cylinder |
| Pistons | Cast Aluminum |
| Transmissions | 68RFE 6-Speed Automatic, G56 6-Speed Manual, Aisin 6-Speed Automatic (2013+) |
| Weight | 1150 Lbs Dry |
| Engine Oil Capacity | 12 Quarts or 11.4 Liters |
| Coolant Capacity | 5.7 Gallons or 23.8 Quarts |
| Fuel | 2007.5-2013 B5 Compatible, 2013.5+ B20 Compatible |
| Fuel Tank Size | 28 or 32 Gallons |
| DEF Tank Size | 5.5 Gallons |
| Governed Speed | 3,013 rpm (2007-2012 Models), 3,000 rpm (2013+) |
Horsepower and Torque
The 4th generation Cummins engine saw significant increases in horsepower and torque over the years. Below is a summary of stock figures:
| Year | Transmission | Stock Horsepower | Stock Torque |
|---|---|---|---|
| 2007-2010 | 68RFE Automatic, G56 Manual | 350 Horsepower | 650 lb/ft |
| 2011-2012 | 68RFE Automatic, G56 Manual | 350 Horsepower | 800 lb/ft |
| 2013-2014 | G56 Manual, 68RFE Auto, Aisin Auto (Dually Only) | 350 Horsepower, 370 Horsepower, 385 Horsepower | 660 lb/ft, 800 lb/ft, 850 lb/ft |
| 2015 | G56 Manual, 68RFE Auto, Aisin Auto (Dually Only) | 350 Horsepower, 370 Horsepower, 385 Horsepower | 660 lb/ft, 800 lb/ft, 865 lb/ft |
| 2016-2017 | G56 Manual, 68RFE Auto, Aisin Auto (Dually Only) | 350 Horsepower, 370 Horsepower, 385 Horsepower | 660 lb/ft, 800 lb/ft, 930 lb/ft |
| 2018 | G56 Manual, 68RFE Auto, Aisin Auto (Dually Only) | 350 Horsepower, 370 Horsepower, 385 Horsepower | 660 lb/ft, 800 lb/ft, 930 lb/ft |
6.9 IDI: A Brief Look into Another Iconic Engine
While discussing Cummins engines, it’s essential to acknowledge the significance of the 6.9L IDI (Indirect Injection) engine, which had its unique place in the world of diesel powertrains. Introduced by Ford in the early 1980s, the 6.9 IDI was renowned for its robustness and reliability.
Key highlights of the 6.9 IDI Engine:
- Displacement: With a displacement of 6.9 liters, it provided a respectable amount of torque and power for its time;
- Fuel Injection: The 6.9 IDI utilized indirect injection, which involved pre-chamber combustion. This method was known for its simplicity and durability;
- Horsepower and Torque: While not as powerful as modern diesel engines, the 6.9 IDI was capable of producing around 170 horsepower and 315 lb/ft of torque. These figures may seem modest today, but they were competitive during its era;
- Reliability: One of the standout features of the 6.9 IDI was its legendary reliability. Many owners attest to its ability to withstand heavy loads and harsh conditions;
- Legacy: The 6.9 IDI holds a special place in the history of diesel engines, serving as a predecessor to more advanced powerplants like the Cummins 6.7L we discussed earlier.
Though it may not be directly related to the 4th generation Cummins, the 6.9 IDI engine deserves recognition for its role in shaping the diesel engine landscape. It remains a cherished choice among enthusiasts and collectors who appreciate its simplicity and ruggedness.
Emissions Compliance
The 6.7L Cummins engine was developed to meet stringent emissions requirements. As carbon emissions became a growing concern, various emissions control devices were introduced, including a Diesel Particulate Filter (DPF), Exhaust Gas Recirculation (EGR), and Selective Catalytic Reduction (SCR).
Conclusion
In conclusion, the 4th generation 6.7L Cummins engine left a lasting impact on the Ram HD lineup, offering increased power, advanced technology, and adherence to emissions standards. This comprehensive guide provides a detailed insight into the engine’s specifications and performance characteristics from 2010 to 2018. For product recommendations and performance upgrades, refer to our post dedicated to 2010-2018 Ram HD Trucks.
