Deep Dive: How Did the New 6.7L Cummins Get to 1,000 Lb-Feet of Torque? Explained (Video)

This is the new Cummins 6.7-liter turbo-diesel and there’s some serious numbers being generated by it. Photo: TFLtruck

There is a lot of interest with the new (or significantly updated) 6.7-liter Cummins that’s powering many of the 2019 Ram heavy duty pickup trucks. The fact that this Cummins diesel can make 400 horsepower and up to 1,000-lb-ft of torque is mind blowing.

Cummins is celebrating 100 years in business and it’s their 30th year of powering Dodge/Ram pickup trucks.

Andre interviews Roger Hapka, Lead Engineer for Cummins Pickup Truck Engines, at their engine booth in the 2019 NAIAS (North American International Auto Show) in Detroit, MI.

Roger Hapka and Andre Smirnov talk torque. Photo: TFLtruck

The base of the improvements comes from the Compacted Graphite Iron (CGI) block used in this application. According to Hapka, “It’s a much higher strength material which becomes part of the equation to gain the higher torque capacity.”

Stonier crankshaft, main marring caps with larger bolts, piston-pins with bushings, thicker flex plate (which is 10-bolt replacing the 8-bolt) and more. Yet, despite all of these increases, they focused on noise vibration and harshness including the addition of hydraulic lash adjusters

The numbers speak for themselves. Photo: TFLtruck

A new Bosh fuel-injection unit and a modified turbocharger are both needed for the increased performance demands.

In this video, Andre gets to do a deep dive into this remarkable power plant and gives us a detailed interview to boot!

We will be testing this power plant in every single way we can – including a battle against our toughest test, the “Ike Gauntlet.”

Easily amused by anything with four wheels, Nathan Adlen reviews vehicles from the cheapest to the most prestigious. Wrecking yards, dealer lots, garages, racetracks, professional automotive testing and automotive journalism - Nathan has experienced a wide range of the automotive spectrum. Brought up in the California car culture and educated in theater, childhood education, film, journalism and history, Nathan now lives with his family in Denver, CO. His words, good humor and video are enjoyed worldwide.