As we were first to report just a few days ago, the 2017 Chevy Silverado HD and 2017 GMC Sierra HD are getting a new Duramax diesel engine to replace the 6.6L Duramax V8 LML. In the days following the discovery, we’ve compiled a list of things that we know about GM’s new HD diesel, and what we don’t.
First, here is what we do know about the powerhouse, courtesy of various sections of the official order guide:
- It is assigned GM RPO code L5P
- It displaces 6.6 liters
- It is B20 compatible (20% biodiesel and 80% petroleum diesel)
- Like its predecessor, it remains mated to the Allison 1000 6-speed automatic transmission
- It works in conjunction with the new intake system on the 2017 GM HD trucks
- It is available across all trim levels of the 2017 Silverado HD and 2017 Sierra HD
What we don’t know is the juiciest, most important details: the power and torque ratings. Yes, we have seen the “rumored” (or perhaps speculated) figures of 445 horsepower and 850 pound-feet of torque floating around various websites. Whether those figures are true or not will be seen when GM officially announces the motor and its 2017 Heavy Duty trucks.
However, we feel responsible to note that GM’s outgoing LML makes 397 horses @ 3,000 RPM and 765 pound-feet of torque @ 1,600 RPM. In addition, Ford’s 6.7L PowerStroke Turbo Diesel V-8 in the 2017 F-Series Super Duty is rated at a whopping 440 horses @ 2,800 RPM and a segment-leading 925 pound-feet of torque @ 1,800 RPM. Those figures allow it to tow a maximum of 27,500 pounds from the fifth wheel, which is 4,300 pounds more than the 23,200 pound fifth-wheel rating of the 2016 Silverado 3500 HD/Sierra 3500 HD. Moreover, the gooseneck trailer rating for the F-450 Super Duty is an astounding 32,500 pounds.
Here’s to anxiously awaiting official figures and specs of the new L5P, as well as the capabilities of the 2017 Silverado HD and and 2017 Sierra HD. When all of those show up, you can bet that we will be here to cover it stat.
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