A die-cast aluminum lower crankcase also strengthens the engine block and serves as the lower engine cover, while reducing its overall weight. It retains the same 4.05-inch (103mm) and 3.89-inch (99mm) bore and stroke dimensions as the current engine, retaining the Duramax’s familiar 6.6L (403 cu.-in./6,599 cc) displacement.Ī deep-skirt design and four-bolt, cross-bolted main caps help ensure the block’s strength and enable more accurate location of the rotating assembly. The intake design is another example of the advanced integration included in the 2017 Sierra HD that makes it over-the-road capable.Īs with previous versions, the new Duramax block features a strong cast-iron foundation known for its durability, with induction-hardened cylinder walls and five nodular iron main bearings. That allows the Duramax to maintain more power and vehicle speed when trailering in the toughest conditions. Cooler air helps the engine run better under load, especially in conditions where engine and transmission temperatures can rise quickly. of torque (1,234 Nm) at 1,600 rpmĪ new, patent-pending vehicle air intake system - distinguished on the Sierra HD by a bold hood scoop - drives cool, dry air into the engine for sustained performance and cooler engine temperatures during difficult conditions such as trailering on steep grades. SAE-certified 445 net horsepower (332 kW) at 2,800 rpm.New rocker cover/fuel system acoustical treatments.New full-length damped steel oil pan that contributes to quietness.New electrically actuated/electronically controlled turbocharging system.New EGR system with single cooler and integrated bypass.Increased oil- and coolant-flow capacity.New, stronger rotating and reciprocating assembly.New, stronger cylinder block and cylinder heads.“You’ll also notice the refinement improvements the moment you start the engine, and appreciate them as you cruise quietly down the highway - with or without a trailer.” “Nearly everything about the Duramax is new, designed to produce more torque at lower rpm and more confidence when trailering or hauling,” said Gary Arvan, chief engineer. The Duramax’s signature low-rpm torque production hasn’t changed and still offers 90 percent of peak torque at a low 1,550 rpm and sustains it through 2,850 rpm. The new Duramax 6.6L shares essentially only the bore and stroke dimensions of the current engine and incorporates a new, GM-developed control system. “The new Duramax takes those traits to higher levels.”
“With nearly 2 million sold over the past 15 years, customers have forged a bond with the Duramax diesel based on trust and capability,” said Dan Nicholson, vice president, Global Propulsion Systems. In fact, engine noise at idle is reduced 38 percent. (1,234 Nm) - to enable easier, more confident hauling and trailering.Īlong with a 19 percent increase in max torque over the current Duramax 6.6L, the redesigned turbo-diesel’s performance is quieter and smoother, for greater refinement. This next-generation redesign offers more horsepower and torque than ever - an SAE-certified 445 horsepower (332 kW) and net 910 lb.-ft. All-New Duramax 6.6L Diesel Is Our Most Powerful EverĭALLAS - GMC today announced the redesigned Duramax 6.6L V-8 turbo-diesel offered on the 2017 Sierra HD.
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