The stalwart 6.6L Duramax diesel engine is getting a makeover and the new 2017 Chevrolet Silverado HD will offer it first. Redesigned with many changes, the 6.6L diesel engine now will produce a staggering 445 HP and 910 lb-ft. of torque. Not only is it more powerful, it is quieter too and should be a big hit for consumers looking for power without the noise.
General Motors says the new Duramax engine is a 19 percent increase in max torque and engine noise is reduced an incredible 38 percent over the previous generation.
“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 said in a press release. “The new Duramax takes those traits to higher levels.”
In order to quiet this noise and increase power, GM says they incorporated a new, “GM-developed control system.” There were no changes to the 4.05″ and 3.89″ bore and stroke dimensions and the low-rpm torque production hasn’t changed.
They did make a host of changes like:
- New, stronger cylinder block and cylinder heads
- New, stronger rotating and reciprocating assembly
- Increased oil- and coolant-flow capacity
- New EGR system with single cooler and integrated bypass
- New electrically actuated/electronically controlled turbocharging system
- All-new advanced solenoid fuel system
- All-new electronic controls
- New full-length damped steel oil pan that contributes to quietness
- New rocker cover/fuel system acoustical treatments
- B20 bio-diesel compatibility
- SAE-certified 445 net horsepower (332 kW) at 2,800 rpm
- SAE-certified 910 net lb.-ft. of torque (1,234 Nm) at 1,600 rpm
The other big change is on the hood with the scoop. This functional scoop allowed GM engineers to push more power out of the engine due to the increase in airflow helping to cool the engine and sustain performance. Using the additional airflow of cooler air really helps when the engine is under load and temperatures rise quickly. It also helps keep the engine running smoother and quieter.
GM has being working hard at reducing noise as of late on their trucks with triple-sealed doors and adding sound reduction materials throughout the cabin. Now, with redesigning, the engine, GM seems poised to further reduce cabin noise making their trucks seem more like a refined luxury car rather than a pickup.
The 2017 Chevrolet Silverado HD will be the first to be offered with the new Duramax engine and will still be equipped with the 6-speed Allison transmission. It is expected to be on dealer lots soon.