Devotee car enthusiasts the world over are into the details. They’re interested in learning about all the bells, whistles, and the newest models of their favorite rides. And no detail is too tiny regarding a vehicle’s specs. So, what are the engine specs of the all-new 2022 Ram 2500?

First, though, are you interested in skipping ahead and seeing what the vehicle has to offer? Want a test drive? If so, explore for all the details. Meanwhile, let’s lay bare the engine’s specs:

Two Engine Options

The engine options for the new Ram 2500 are nothing short of impressive. Drivers can choose from:

  • A gas-powered Chrysler 6.4L HEMI V8
  • A 6.7L Cummins Turbo Diesel I6

The Best in Power and Efficiency

The 6.7 diesel engine delivers between 370 and 420 horsepower and 850 – 1,075 lb-ft of torque. RAM 2500 trucks fitted with a 68RFE Automatic transmission boast 370 hp and 850 lb-ft of torque, while the high-output rating is reserved for the RAM 3500. The idea is to match the power to the specific models in question.

That said, the new Ram 2500 is one of the most powerful trucks on the market and arguably the most efficient in its class – the six-cylinder engine is a Cummins product delivering best-in-class fuel economy. The 2021 version is a culmination of Cummins’ relationship with RAM truck, spanning over 30 years. It’s also part of a lineup that includes the Cummins 5.9L turbo diesel – the flagship model dating back to 1989. In short, we’re talking about a history of durability.

Gas variants used in RAM 2500s boast roughly 366-485 hp (273-362 kW) at 4,600-6,000 revolutions per minute. In terms of torque, they deliver 429-475 ft-lb, lower figures than their diesel counterparts.

Bore and Stroke

The bore and stroke of the new Ram 2500’s engines have also increased. The 6.4L HEMI V8, for example, has a bore and stroke of 4.09 x 3.72 inches (103.9mm x 94.6mm). This is an increase of .39 inches (9.9mm). Meanwhile, the diesel variant has a bore and stroke of 4.21 in x 4.28 in (107mm x 124mm).

Compression Ratio

Cummins’ standard 6.7 diesel engine features a compression ratio of 19:1, while the high output variant boasts a 16.2:1 ratio. The compression ratio compares the volume of gas in the cylinder when compression commences with the volume at the end. In other words, it measures how much the gas is compressed. Usually, a high compression ratio results in more power.

HEMI RAM trucks have a compression ratio of 10.0:1 – typical of gas engines as opposed to diesel. The lower ratio makes them less efficient but helps keep the engine cooler.


The 6.4L HEMI V8 has a displacement of 392 cubic inches (6,407cc), while the 6.7L Cummins Turbo Diesel engine displaces 408 cubic inches or 6,727cc. Displacement is the combined volume of an engine’s cylinders and is one of the critical elements in understanding an engine’s size.

Fuel Injection

New Ram 2500’s engines also feature significant improvements in fuel injection. For example, the four-stroke, 6.4L HEMI V8 features the next generation of the Variable Valve Timing (VVT). Plus, it’s naturally aspirated – no turbochargers or superchargers. It also uses Chrysler’s proprietary cam phasing system, complete with hydraulic roller lifters. A sequential multi-port injection system delivers fuel to the 6.4L engine.

The diesel version is turbocharged, meaning air is forced into the engine under pressure. This increases the amount of oxygen available for combustion, increasing power. Also, the motorsports a charge air cooler, a heat exchanger designed to cool the air coming from the turbocharger before getting into the engine. This increases density, meaning more oxygen and fuel can enter the cylinders, enhancing engine output.


The weight of the new Ram 2500’s engines has also increased. The 6.4L HEMI V8, for example, weighs 500 lbs (227 kg) – dry weight, while the diesel variant weighs 1,071 lbs (486kg).

Generally, diesel engines tend to be heavier than gas versions in the same class because of the extra components required for compression ignition. For example, the 6.7L Cummins Turbo Diesel engine has a cast iron cylinder head and graphite iron block – necessary for withstanding the high temperatures and pressures associated with diesel combustion. On the other hand, the gas version of the engine comes with a cast iron block and aluminum cylinder head.

No matter what you need a pickup truck for, the Ram 2500 is up to the task. It has the power to tow up to 19,780 pounds and the capability to carry 4,050 pounds in its bed. And whether you opt for the petrol or diesel version, three things are clear: the new Ram 2500 is more powerful, rugged, and efficient than ever before.

By Manali