For 2017, GM decides it's time to refresh and toughen up their 6.6-liter Durmax diesel engines for their Chevrolet Silverado and GMC Sierra HD trucks. The extra boost in power will provide the already stout HD trucks with 455-hp, up from last year's 397-hp. And the new torque ratings for the Durmax will be boosted up to 910-lb.-ft. of torque, a bump from the 765-lb.-ft. of torque from the previous year.
90% of this new found torque can be available at a very low 1,550-rpm, helping you take off from a dead stop very effortlessly even when towing an extraordinary amount of weight.
- The refreshed Durmax gets its power from a mound of new and beefed up engine components:
- Cylinder Heads
- Connecting Rods
- Venturi Jet Drain Oil Separator
The Venturi Jet Drain Oil Separator uses boost from the turbocharger to suck more oil back into the sump, ensuring the oil doesn’t get in places it’s not supposed to go. GM also strengthens up their notorious Allison six-speed transmission to help deal with the new torque numbers, making the Durmax HD trucks more powerful and durable than ever.
Along with all of the beefed up new components, the Durmax will also be able to run on B20 fuel, which is a mix of 20% Biodiesel and 80% conventional diesel fuel.
So how does the 2017 Durmax setup match-up with the other competitors? The Ford Super Duty 6.7-liter Powerstroke diesel puts out 440-hp, but the Ford still takes the torque crown for 2017 with 925-lb.-ft. of torque. The Ram HD sports an inline six-cylinder diesel that puts out 385-hp with a very stout 900-lb.-ft. of torque, not bad for a six-cylinder.
Since it doesn't seem like the competitiveness for big torque numbers is going to go away anytime soon, one would have to suspect that the possibility of seeing these HD trucks coming in at 1,000-lb.-ft. of torque+ very soon, is very real.