prev
  • GMC Sierra with Duramax Diesel engine towing a boat.
next

DURAMAX® DIESEL 101: BASICS AND BENEFITS

What’s a diesel engine? Why would you want one in your pickup truck? Learn the basics and benefits of opting for a diesel engine, including the Duramax® Diesel engines available in the GMC Canyon and GMC Sierra HD.

From driveline to cab configuration and everything in between, there are many options to consider when buying a new pickup truck. One decision involves the choice of engine. Some pickup trucks — including the GMC Canyon and the GMC Sierra HD — also offer a diesel engine as an available option.


What’s a diesel engine? Why would you want a Duramax® Diesel in your next GMC pickup? Here are some of the basics and benefits of a diesel engine.

GMC Duramax Diesel engine.

WHAT MAKES A DIESEL A DIESEL?

Fundamentally, diesel engines operate much like a gasoline engine. Within the engine itself, a controlled combustion within a cylinder chamber causes pistons to move up and down, which in turn causes a crankshaft to rotate. That force is essentially the power that ultimately moves your truck.
 

However, a diesel’s combustion process is much different from a gasoline engine. Most gasoline engines are known as spark-ignition engines. In these designs, internal combustion is produced once a mixture of fuel and air is ignited within a cylinder head by an electrical spark plug.
 

Diesel engines are known as compression-ignition engines. Diesel fuel — which is far different than gasoline — is injected into the combustion chamber at high pressure once the air inside the cylinder has already been compressed to a high-pressure level. Because the air inside the cylinder grows hot when it’s compressed, it’s warm enough to ignite the diesel fuel without needing a spark, or a spark plug.

A GMC Sierra pickup truck with Duramax Diesel engine towing a trailer.

WHY IS A DIESEL RIGHT FOR ME?

But why choose a diesel over a gasoline engine? Diesels, like the Duramax® Diesel turbo-diesel 2.8-litre I-4 offered in the GMC Canyon mid-size pickup truck, and the 6.6-litre turbo-diesel V8 available in the GMC Sierra HD, offer distinct advantages that may be beneficial in how you plan on using your new truck.
 

  • Low-End Torque: Torque is the measure of an engine’s ability to move heavy loads, whether it’s a payload in a pickup box or a heavy trailer attached to the hitch. Having more torque is always a good thing, but having a substantial amount in the lower ranges of the engine’s rev band makes it easier to quickly and confidently launch a loaded truck. That can be quite advantageous when pulling a heavy trailer on a highway on-ramp. Because of their high cylinder compression and long piston stroke, diesel engines are generally able to produce a substantial amount of low-end torque. Certainly, GMC’s latest Duramax® Diesel 6.6-litre V8, available in the 2017 Sierra 2500HD and 2017 Sierra 3500HD, provides plenty of pulling power. This state-of-the-art diesel engine produces a tremendous 910 lb.-ft. of torque, with over 90 percent of that power available just over 1500 rpm. Even our smaller Duramax® Diesel, the 2.8-litre turbo-diesel four-cylinder available in the GMC Canyon, offers 369 lb.-ft. of torque at 2000 rpm.
     
  • Enhanced Trailering: Diesel trucks often provide higher trailering ratings than comparably-equipped trucks with a gas engine. For instance, a two-wheel drive Canyon crew cab equipped with the 3.6-litre gasoline V6 has a max trailer weight1 rating of up to 3175 kg (7000 lb.). A comparably-equipped two-wheel drive Canyon crew cab equipped with the available Duramax® Diesel 2.8-litre I-4 engine, however, has a max trailer weight1 rating of up to 3493 kg (7700 lb.) – the highest towing rating in its class.2
     
  • Exhaust Braking: Both our Duramax® Diesel engines are offered with an exhaust brake, which leverages engine compression to help slow the vehicle down and provide the driver with enhanced control, especially on steep hills. Using the exhaust brake can slow a truck on long, steep stretches with reduced wear on the conventional brake system.
     
  • Improved Efficiency: There’s no better example of a diesel engine’s ability to operate efficiently than the Canyon Diesel. Canyon’s available 2.8-litre turbo-diesel four-cylinder engine allows it to offer impressive fuel consumption ratings. Two-wheel drive Canyon Diesel offer an estimated fuel consumption rating of 10.8 L/100 km city and 7.9 L/100 km highway 4x23 – the best fuel efficiency rating of any pickup truck in its class.2