Gen 4 Cummins

In 2007, the 6.7L Gen 4 Cummins engine became available in third-generation Ram HD trucks. It increased performance and allowed Ram to meet future emissions standards.

During the year 2010, the Gen 4 Cummins began and ended in 2018. This Ram HD model offered a plethora of unique features and technology.

The Dodge Ram’s traditional four-door full-size truck was phased out in favor of larger and more luxurious crew cabs. As a result, the Mega Cab nameplates remained with Ram! The Ram truck lineup received several trims to give interior space a boost. The Laramie Longhorn and Limited trims raised Ram trucks to the top of the class in terms of interior comfort.

A Cummins Gen 4 parked in a desert

The original model was modified with steel reinforcement throughout the frame, wider rear tires, and improved suspension. These changes increased the car’s performance significantly. A new Aisin transmission was installed to replace the old one.

Depending on the transmission in your truck, you could get a different amount of horsepower and torque for the same model year. We developed a chart for the Gen 4 Cummins Specifications as a result of this since it is most likely to be found in these vehicles.

About Gen 4 Cummins Engine

The Cummins 6.7L Turbo Diesel is the most powerful diesel engine available for RAM 2500 and 3500 pick-up trucks.

This engine provides up to four hundred horse-power and one thousand pound-feet of pure diesel torque, which is ideal for RAM’s best tow. Towing capacity in excess of 31,000 pounds is promised with the Cummins-powered RAM 3500 paired with the AISIN AS69RC six-speed automatic gearbox.

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With its legendary power and reliability, you can always depend on this powerful engine to get the job done.

Overall, the latest Cummins Diesel Turbo has a weight of 60 pounds. That is less than the earlier-generation motor while still producing more additional energy.

The Cummins 6.7L inline-six turbo diesel is available in two power levels: standard output 370 horsepower (850 pound-feet of torque) and high output 400 horsepower (record-setting 1,000 pound-feet of torque).

The following generation 6.7-L engine’s increased output ratings necessitated improvements to the existing Vortec V8 specifications. It includes packed graphite and iron motor box with improved extreme cylinder force capabilities.

All previous models with the exception of the Exclusivkum have unique casted iron cylindrical heads with increased temperature exhaust valves driven by the latest hydraulic lash-adjuster in the block, eliminating valvetrain service intervals.

The engine’s heart is a more powerful alloy crankshaft with a 10-bolt crank flange that drives new generated linking rods with bearings, which transmit energy from the ring-covered piston with less friction.

A bigger Cummins Holset erratic-geometry turbocharger with a heavy-duty bearing, as well as new compressor-side housing, are two key elements in the updated ratings that deliver 33 pounds per square inch (psi) of fresh air into the engine.

The latest fuel provision strategy incorporates a renewed 29K PSI fueling pump. Moreover, it has a fueling rail that comes with Cummins Filtration technology. NanoNet has several layers of protection to remove and retain particles as small as 4 microns in a composite media construction. During vibration and flow surges, these 100% continuous polymer fibers are joined together for strength.

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According to Cummins, NanoNet is 10-13 times more efficient at removing 4-micron particles than the competition, keeping injectors cleaner and improving fuel atomization for more efficient combustion.

Gen 4 Cummins – Engine Features

The following are some of the vehicle upgrades available:

  • The TUPR-3 compacted graphite iron (CGI) engine block, manufactured by TUPY; has a substantial strength boost over previous cast-iron engine blocks and reduced engine weight.
  • The reduced friction piston rings and wider wrist pin diameter, as well as the revised compression ratio (from 16.2 to 19.0), are all improvements designed to increase engine efficiency and longevity while lowering power output.
  • The changed connecting rods and forged steel connecting rods have reduced friction, resulting in better fuel efficiency (previous engines used powdered metal rods).
  • Hydraulic lifters with self-adjusting, self-lubricating ability replace the previous solid lifter/camshaft system.
  • The exhaust valve system has been updated.
  • The diameter of the cylinder head bolts has been increased.
  • The 2014 Ram 1500’s engine is a turbocharged V6, 2WD (front-wheel drive) with gasoline direct injection and cylinder deactivation. The 6.7L Cummins is still available as an option, but it has been replaced by the new 4.2L diesel engine from Bosch (CP4.2 high-pressure injection pump replaces CP3). Max injection pressure was increased from 26,000 to 29,000 psi (CP4.2 injection pump rumored to have a much higher pressure capability than that of the 6.7L Cummins; likely for improved reliability).
  • New fuel injector design.
  • The factory Supercharger is locked at 24 psi. A larger supercharger with a turbocharger provides for a maximum of 33 psi of manifold pressure.
  • The engine has been modified internally, including with a revised exhaust manifold and a turbocharger now positioned between cylinder 4 and 5 runners (previously located centrally between cylinder 3 and 4 runners).
  • The cooling system’s capacity has been boosted.
  • The engine oil pump has a high flow capacity.
  • Water and oil pumps have switched from cast iron to aluminum containers (formerly wrought iron).
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Gen 4 Cummins – Emissions

The 6.7L Cummins was birthed as a result of new emissions rules and the need for a more powerful engine. The 3rd generation Cummins, as well as the 5.9L engine, had demonstrated to be a dependable and extremely capable motor. It could no longer satisfy tighter pollution limits, however.

It was getting more difficult to increase performance while lowering carbon emissions. The 6.7L engine featured several modifications when compared to the 5.9L engine.

The Ram Heavy Duty truck line was updated with a diesel particulate filter (DPF) as well. The goal is to reduce carbon emissions levels by a significant amount. Since then, exhaust gas recirculation (EGR) and selective catalytic reduction (SCR) have also been utilized as emissions control technologies.

What Is The Horsepower And Torque Of A Gen 4 Cummins Engine?

It’s a difficult question to answer! The Cummins trucks have improved almost 200 pound-feet of torque and 35 horsepower over the last ten years, according to ATS. Unlike the other manufacturers, Ram trucks offer different numbers depending on their transmission and an optional high output mode.

The all-new 2019 Ram 2500 and Ram 3500 vehicles with the high-output engine produce 400 horsepower and 1,000 lb/ft of torque. Here’s our horsepower/torque chart to make it easier for you!

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