The 5th gen 6.7L Cummins? Yeah! It’s robust and dependable for many cars, from pickups to Class 8 trucks. Compared to the older models, this motor improves horsepower, torque, fuel economy, and emissions control. It’s the perfect selection for drivers who need extra power and economy.
So, let’s observe some of its key specs and features!
Engine Specifications
The 5th Generation 6.7L Cummins engine is designed for maximum torque and power. It has a proven history of reliability in all kinds of climates and conditions. It meets strict EPA emission standards with its advanced high-pressure typical rail design, VGT technology, and improved EGR system.
Engine Specifications:
- Compression Ratio: 16:1
- Max Power Output: 370HP @ 2,400 RPM
- Max Torque Output: 865 LB/FT @ 1,500 RPM
- Displacement: 6.7L (406 cu in)
- Weight with Alternator & Fan Installed: 1444 LBS
- Block Material: Cast Iron
- Cylinder Head Material is Available in Both Aluminum & Cast Iron
- Configuration: Inline/6 Cylinder
Bore & Stroke Dimensions & Power Ratings:
- Bore – 4.88″ / Stroke – 4.71″
- Power Ratings: 350HP @ 2200 RPM or 370HP @ 2’400 RPM
Fuel System Specifications:
- Type: High-Pressure Common Rail (HPCR) – Bosch 2800 Bar
- Driving Method: Bosch CP3 Injection Pump with VGT Variable Geometry Turbocharger (VGT)
Cooling System Specifications:
- Capacity – 13 Quarts
- Low Temp Coolant Tolerance Rating – -34°F (-37°C)
- Cooling Type – Liquid Coolant
Engine Features
The Cummins 6.7L engine packs various features for superior performance and efficiency. Technologies include an EGR system, an after-treatment system with a DPF and SCR, and a B-20 biodiesel-compatible fuel system with Bosch common rail fuel injection. It features an aluminum alloy cylinder head, cast iron lower deck, and pistons cooled by oil jets connected to the crankshaft. Low-pressure turbochargers and a six-speed automatic transmission optimize gear ratios.
The engine operates on advanced electronics and utilizes real-time data to monitor parameters. Filters are designed specifically to keep contaminants out and ensure durability. High-quality components minimize deterioration over time, so there’s little maintenance needed.
Fuel System
The 5th gen 6.7L Cummins fuel system is top-notch. It’s a variable-rate, four-stage fuel pressure unit, meaning it’s ultra-efficient and delivers maximum performance. Let’s delve into the details of this engine’s fuel system!
High-Pressure Common Rail Fuel System
The 5th Generation Cummins 6.7L engine has a high-pressure standard rail fuel system. This system gives precise injection timing and fuel distribution to the cylinder. It offers excellent power, less noise, smoother engine operation, and higher performance.
The standard rail fuel system has an electronically controlled high-pressure pump. It can produce pressures up to 2750 bar (40k PSI). Accumulators maintain high-pressure levels for correct fuel delivery.
The Front End Accessory Drive (FEAD) supplies power to open or close the injector nozzle during combustion. This produces atomized diesel exhaust particles that burn quickly, using all the air in the cylinder. It also reduces NOx emissions and engine noise by dampening moving parts near injectors.
Fuel Injectors
The 6.7L Cummins engine has uprated fuel injectors, which help it produce more power and provide reliable performance. These Bosch “Pico” 0 407 988 545 injectors have a firing time of just two milliseconds, making them suitable for high-load applications.
They can open up to 25,000 psi, providing higher flow rates than their predecessors. And, with their two-filament check valve design and continuous flow design, they require very little maintenance.
The Pico nozzle design prevents clogging and sticking, resulting in superior reliability than traditional nozzles. Plus, these injectors reduce noise due to their design. This ensures more precise fuel delivery for improved combustion rates and enhanced emissions control.
Exhaust System
The exhaust system of the 6.7L Cummins 5th gen is essential. It makes sure gases are expelled from the engine correctly. The system is formed of many parts. Each of these has a vital role in the engine’s performance.
In this part, we will look at the different parts of the exhaust system and what they do:
Exhaust Gas Recirculation System
The Exhaust Gas Recirculation (EGR) system is designed to reduce emissions. It does this by recirculating a portion of the exhaust gas back into the intake manifold. This mixes in with fresh air, reducing Nitrogen Oxide (NOx) and improving fuel efficiency.
The EGR system found on 5th Generation (2011-2018) 6.7L Cummins diesel pickup trucks includes an EGR cooler and valve. The valve works as a one-way valve, allowing only exhaust gas to pass through it. It lets some of the exhaust gas from the turbocharger into the intake manifold, where it mixes with oxygenated air.
The EGR cooler cools this mixture of incoming exhaust gas and outside air. This prevents detonation and pre-ignition in the cylinders. The size of the EGR cooler depends on various factors. Maintenance should be performed regularly to prevent carbon deposits from clogging the valves. This will reduce NOx reduction and horsepower.
Exhaust Brake
Exhaust brakes help reduce engine braking, especially when downshifting. They do this by controlling how air flows into the exhaust system. Usually, these brakes are used on big diesel engines with solid engine braking.
The 5th-generation 6.7L Cummins has an integrated exhaust brake. This helps reduce retardation forces, engine load, and temperatures when going downhill or driving for a long time. The vehicle can coast instead of needing service brakes.
The 6.7L Cummins’ integrated exhaust brake works with its Electronic Engine Brake system. This improves retarding and shift timing which increases stability and control when driving in mountainous areas or with heavy loads. The integration also enhances braking performance. It lets the exhaust brake use an exaggerated retarding force when needed, like cornering or climbing. And it eliminates the need for extra devices or add-ons, cutting costs and giving more reliability.
Cooling System
The 5th Generation 6.7L Cummins engine cooling system is designed for optimal temperature regulation. It comprises a coolant reservoir with a thermostat, water pump, radiator, and an overflow tank. Its purpose is to ensure the engine runs at the correct temp regardless of driving conditions.
Let’s take a deeper look at the system’s components:
Radiator
The radiator is a part of the sixth-generation 6.7L Cummins cooling system. It comprises a radiator, fan clutch, water pump, hoses, and a coolant reservoir. Its job is to take the hot coolant and airflow from the fan clutch on the engine fan and disperse the heat into the atmosphere.
This is done by using thin metal fins. High-efficiency aluminum core radiators are used in these Cummins because they are lightweight and robust.
Today’s cooling systems use thermostatically controlled thermostats. They open when it reaches pre-set temperatures. It can draw coolant from the engine and other components, such as turbochargers and intercoolers. Coolant flow is managed with a “tee” pipe with two outlets. One for cold air intake and one for warm air outtake from the bottom portion of the radiator tanks. Electric fans or viscous clutches activate when temperatures reach specific points, sending more airflow over hotter areas. This helps regulate temperatures better than single-point sensors can do alone.
Water Pump
The 5th Gen 6.7L Cummins engine has an electronically controlled centrifugal water pump. This pump uses a blade-type impeller to draw coolant from the thermostat housing. It circulates the coolant through the whole cooling system. The pump is designed to keep a constant pressure with the help of its internal bypass valve. This lets it maintain maximum efficiency and consistent engine temperatures. It also has electric releases for high-temperature applications like towing or off-roading.
A cooling fan with a thermoelectric clutch stays in contact with the radiator. This adds more airflow to the cooling system, helping the engine reach peak performance levels under extreme conditions like:
- high heat;
- hot idle days.
Emissions System
In 2013, the 5th gen 6.7L Cummins was unveiled. It had a revamped emissions system, making it more compliant with the EPA. This system comprises various parts that work together to make the engine run cleaner and better. Let’s examine the emissions system and its characteristics.
Diesel Particulate Filter
A 5th Generation 6.7L Cummins engine is equipped with the Diesel Particulate Filter (DPF). It cleans exhaust gasses and traps soot particles that would otherwise escape. The DPF captures up to 98% of these particles, reducing their amount in the atmosphere. Furthermore, fuel efficiency is improved by thoroughly diluting exhaust gasses into the environment.
The DPF has two chambers divided by a filter element. This element is made of a ceramic blend that can handle extreme heat, trapping particulate matter. Some 5th-generation 6.7L Cummins engines need active regeneration to keep the system performing well. On other systems, this process is automated.
Selective Catalytic Reduction System
The 5th Generation 6.7L Cummins has an advanced Selective Catalytic Reduction (SCR) system. It meets EPA Tier 4 emissions standards. The SCR system reduces emissions with diesel exhaust fluid (DEF), like AdBlue. It converts NOx gases into water vapor and nitrogen.
The EGR system works with the SCR system. It controls oxygen for combustion to reduce NOx production. The DOC helps break down particles before they leave the tailpipe. These systems work together to reduce environmental impacts and meet EPA Tier 4 standards.
Performance
The 5th Generation 6.7L Cummins packs a punch! It can churn out a whopping 800 horsepower and 1800 lb-ft of torque. So it’s perfect for both towing and racing.
Let’s take a closer look at its performance specs:
Horsepower and Torque
The 5th Generation Cummins 6.7L engine outputs between 350-750HP. The max torque is 1,000 lb-ft. New pistons, torque converters, and other components can be added to enhance performance.
Compared to prior generations, this engine has greater fuel output. This gives drivers power for heavy trucks and recreational activities like drag racing. Boost pressures of 28PSI help increase performance and decrease emissions at low loads. To ensure longevity, proper lubrication and cooling systems have to be used.
Acceleration
The 5th gen. 6.7L Cummins Turbo Diesel engine offers top-notch acceleration. It can reach 0-60 mph in under 7 seconds. Plus, it can also do quarter-mile times of 15 seconds or less. This engine is powerful. It requires minimal effort from the driver to achieve fast acceleration. Those seeking more performance from their vehicles will be delighted with its results.
On top of that, it provides excellent fuel efficiency. Highway mileage ratings can go up to 17 mpg.
Reliability
The 5th gen 6.7L Cummins engine is the latest in Cummins’ line of reliable and durable machines. It’s a proven success and can withstand even the most extreme conditions. This section will cover its reliability and provide specs.
Durability
The 5th gen 6.7L Cummins offers unbeatable durability and strength with its cast iron cylinder blocks. It can last for hundreds of thousands of miles before needing an overhaul. SCR technology grants minimal maintenance intervals and improved fuel economy. It also has a longer-lasting timing chain, more extensive crankshaft leading bearing journals, extra cooling capacity, increased bores and stroke size, pressure relief grooves for better oil control, electronically controlled exhaust backpressure valves, and a deep skirt design with cooled EGR systems.
These features make the 6.7L Cummins one of the most reliable diesel engines!
Warranty
The 5th Generation 6.7L Cummins has an industry-leading warranty of five years or 100,000-mile coverage, whichever comes first. Customers can get an extended warranty of up to seven years and 200,000 miles when they purchase the engine. This warranty is transferable, provided routine maintenance is done at recommended intervals.
Total structural or mechanical failure coverage includes parts and labor for repair or replacement. Certain optional accessories may not be covered under warranty, so customers should check with their authorized service center for details.
Frequently Asked Questions
What is the horsepower of the 5th Generation 6.7L Cummins?
The 5th Generation 6.7L Cummins offers up to 370 horsepower.
What type of transmission is available with the 5th Generation 6.7L Cummins?
The 5th Generation 6.7L Cummins is available with either a 6-speed manual or 6-speed automatic transmission.
What is the tow rating of the 5th Generation 6.7L Cummins?
The 5th Generation 6.7L Cummins has a maximum tow rating of up to 17,980 lbs.
