New 445 Horsepower Heavy-Duty Duramax Engine From GM

GMC’s heavy-duty trucks, fitted with the Duramax engine, deliver superior capability and power. The GMC Duramax engine can be counted on to get the job done, and is increasingly looked to by working professionals. GMC’s Duramax engine has forged a bond with customers based on capability and trust. GMC has sold nearly 2 million vehicles powered by the Duramax engine, over the past 15 years.

new 6.6L L5P Duramax turbo-diesel V-8 engine

GMC has now taken the Duramax engine to new heights with the release of the new 6.6L L5P Duramax turbo-diesel V-8 engine destined for GMC’s 2017 model year heavy-duty pickup trucks; including the new 2017 GMC Sierra HD. The redesigned Duramax engine offers more torque and horsepower than ever before, enabling easier trailering and hauling. 

The new 6.6L L5P Duramax turbo-diesel V-8 engine will pump out 445 horses and 910 pound-feet of torque! That’s a 19% increase in max torque over the outgoing Duramax 6.6L! Along with greater torque and more horsepower, the redesigned turbo-diesel Duramax engine is also much quieter. In fact, engine noise, at idle, is reduced 38%. 

The impressive power of the new Duramax engine wouldn’t be possible without the proper amount of air intake. The engineers at GMC have created a new, patent-pending vehicle air intake system that drives cool, dry air into the engine for sustained performance. Cooler air helps the engine run better, especially in conditions where engine and transmission temperatures can rise quickly. That allows the Duramax to maintain more power and vehicle speed when trailering in the toughest conditions. 

The new intake design is distinguished on the 2017 GMC Sierra HD, by a bold hood scoop, and is another example of the advanced integration included in the 2017 Sierra HD that makes it over-the-road capable. 

2017 GMC Sierra Denali 2500 HD

The new Duramax 6.6L is matched with the Allison 1000 six-speed automatic transmission. The transmission has undergone several refinements to accommodate for the new engine’s higher torque capacity, including a new torque converter. The Allison 1000’s Tow/Haul mode reduces shift cycling for improved cooling and better control when towing or hauling heavy loads. 

A new, smart diesel exhaust-brake feature enhances control when descending steep grades. The integrated exhaust-brake system makes trailering less stressful by creating additional backpressure in the exhaust, resulting in negative torque during deceleration and downhill driving, enhancing driver control and prolonging brake pad life. A new electronically controlled, variable-vane turbocharger helps the engine make more power, and revisions to enhance the capability of the exhaust-brake system. 

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