The 6.7 Cummins engine, known for its robust power and reliability, is a popular choice for enthusiasts looking to upgrade their trucks. Swapping a second-generation 6.7 Cummins into a different vehicle is a significant undertaking, requiring meticulous planning and execution. This guide delves into the intricacies of this engine swap, addressing common questions and concerns.
What Vehicles Are Suitable for a 6.7 Cummins Second-Gen Swap?
The feasibility of a 6.7 Cummins swap heavily depends on the recipient vehicle. Larger trucks, such as those from the Dodge Ram, Ford, and Chevy/GMC platforms, are generally better suited due to their robust frames and sufficient space to accommodate the engine's size and weight. Smaller vehicles would likely require extensive modifications, if they're even possible. Factors to consider include:
- Frame strength: The frame must be strong enough to handle the increased weight and torque of the Cummins.
- Engine bay space: The engine bay needs enough clearance for the engine, transmission, and associated components.
- Transmission compatibility: Finding a suitable transmission that can handle the engine's power output is crucial.
- Wiring harness and ECM: The complexity of integrating the engine's computer system (ECM) into the recipient vehicle's electrical system can be significant.
Success often comes from starting with a similar-sized truck, making the process easier. However, custom fabrication and engineering expertise are often necessary regardless of the vehicle.
What are the Common Challenges of a 6.7 Cummins Second-Gen Swap?
A 6.7 Cummins swap is not a simple bolt-on affair. Numerous challenges must be addressed:
- Engine mounts: Custom engine mounts need to be fabricated or sourced to securely position the engine within the engine bay.
- Transmission adapter: You'll likely need an adapter plate to mate the Cummins to the recipient vehicle's transmission.
- Driveshaft modifications: The driveshaft might need to be lengthened or shortened to accommodate the new engine and transmission combination.
- Wiring harness integration: This is arguably one of the most complex aspects of the swap, requiring extensive electrical knowledge and potentially custom wiring.
- Exhaust system: A custom exhaust system might be needed to clear the chassis and meet emissions regulations.
- Cooling system: The engine's cooling requirements might necessitate modifications to the radiator and cooling fan.
What are the Costs Associated with a 6.7 Cummins Second-Gen Swap?
The cost of a 6.7 Cummins swap can vary significantly depending on several factors:
- Engine source: Buying a used engine will be considerably cheaper than buying a new one.
- Labor costs: Hiring a professional mechanic will dramatically increase the overall cost. DIY swaps can save money, but require significant mechanical expertise and time commitment.
- Parts and components: The cost of parts like the transmission adapter, engine mounts, custom wiring, and exhaust system can quickly add up.
Expect to invest a substantial amount of money, ranging from thousands to tens of thousands of dollars, depending on your approach and the level of custom work involved.
What is the Best Transmission for a 6.7 Cummins Swap?
Selecting the right transmission is critical. The stock transmission from a donor vehicle that originally came equipped with the 6.7 Cummins is a good starting point, as it’s already designed to handle the engine's torque. However, other high-capacity transmissions, such as certain Allison automatics or manual transmissions from other heavy-duty trucks, may also be viable options, depending on your vehicle and preferences. Careful consideration of torque capacity and gear ratios is essential.
Is a 6.7 Cummins Swap Difficult?
Yes, a 6.7 Cummins swap is a highly complex undertaking. It demands significant mechanical expertise, welding skills (often), fabrication abilities, and electrical knowledge. Unless you have extensive experience with engine swaps and automotive electronics, it's highly recommended to seek professional help. Undertaking this project without proper skills could lead to costly mistakes and potentially dangerous situations.
This comprehensive guide offers a starting point for anyone considering a 6.7 Cummins second-generation swap. Remember to thoroughly research the specific requirements for your chosen vehicle and always prioritize safety throughout the process. Consult with experienced mechanics and enthusiasts for personalized advice and support.
