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  • Cummins vs Duramax vs Power Stroke - 2020 Diesel Engines

Cummins vs Duramax vs Power Stroke - 2020 Diesel Engines

2020 Diesels Push the 1,000 LB-FT Torque Envelope

Dec 27, 2019
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As we prepare to start a new decade, let's take a last look at 2019; a year that we're sure fans of Model Year 2020 Ford, GM and Ram heavy-duty pickup trucks are calling "spectacular," thanks to the Power Stroke, Duramax and Cummins diesel engines under their hoods.
The newest oil burners are all about torque. Serious twist, the kind that makes these rigs, when lined out accordingly, capable of towing up to 37,000 pounds. Here is some quick data about each platform. With four-digit torque now "common" for the diesels found in non-commercial rigs, how long will it be before the 500-horsepower mark is eclipsed?

CUMMINS

Ram started the party in early 2019, by announcing that the high-output Cummns 6.7L I-6 engine in its heavy-duty rigs makes 400 hp and 1,000 lb-ft of torque (370hp/850 lb-ft for the standard version). At the time, the HO powerplant was the first Big-3 diesel to reach that torque plateau, which also gave Ram 3500 the top spot in the towing war, with its 35,100-pound maximum rating (for a regular-cab 3500 dualie).
SPECIFICATIONS
Engine: Cummins B-Series
Displacement: 6.7L (408 ci)
Configuration: I-6
Power: 370 hp @ 2,800 rpm (68RFE automatic transmission)
Torque: 850 lb-ft @ 1,700 rpm (68RFE automatic transmission)
Power: 400 hp @ 2,800 rpm (AS69RC automatic transmission, 3500 only)
Torque: 1,000 lb-ft @ 1,600 rpm (68RFE automatic transmission, 3500 only)
Turbocharging: Single variable-geometry turbocharger
Bore x stroke: 4.21 x 4.88 inches
Compression ratio: 16.2:1
Valvetrain: OHV with four valves per cylinder
Head Material: Cast iron
Block Material: Cast iron
Transmission: Six-speed automatic
Photo 2/7   |   001 Cummins Duramax Powerstroke Web Cummins Engine
Photo 3/7   |   002 Cummins Duramax Powerstroke Web Ram 3500 Dualie

DURAMAX

While horsepower and torque for the 6.6L Duramax L5P V-8 engine in Chevrolet's and GMC's 2020 big rigs is still 445hp and 910 lb-ft (since 2017), the powerplant's performance and efficiency was catapulted to the next level by the all-new, Allison ten-speed automatic transmission that is now standard in those rigs.
Despite having less torque than its competitors, the Duramax combined with the 10L1000 gearbox created more towing capability for new Chevys and GMCs (35,500-pounds maximum for regular-cab, two-wheel-drive dualie). So, in essence, less (engine output "by the numbers") resulted in a bit more (towing) for GM, as the improved drivetrain edged its Bowtie and Jimmy rigs in front of Ram by 400 pounds.
SPECIFICATIONS:
Engine: Duramax L5P
Displacement: 6.6L (403 ci)
Configuration: V-8
Power: 445 hp @ 2,800 rpm
Torque: 910 lb-ft @ 1,600 rpm
Turbocharging: Singe variable-geometry turbocharger
Bore x stroke: 4.05 x 3.89 inches
Compression ratio: 16.0:1
Valvetrain: OHV with four valves per cylinder
Head Material: Cast aluminum
Block Material: Cast iron
Transmission: Ten-speed automatic
Photo 4/7   |   003 Cummins Duramax Powerstroke Web Duramax Engine
Photo 5/7   |   004 Cummins Duramax Powerstroke Web Duramax Allison
Photo 6/7   |   005 Cummins Duramax Powerstroke Web Silverado 3500hd Dualie

POWER STROKE

It almost seems like Ford was just lying in the weeds and waiting for Ram and GM to shoot their best shots, before unleashing 2020 Super Duty and its third-generation 6.7L Power Stroke engine in late 2019.
The announcement of Power Stroke's segment-smashing 450 hp and 1,050 lb-ft of torque took the truck-buying public by storm (like Duramax, Ford's engine is also mated to a ten-speed [10R140 TorqShift] automatic transmission), and moved Super Duty to the head of the class in towing capacity, with an unfathomable—and we'll say "for now"-- maximum limit of 37,000 pounds.
The third-generation 6.7L Power Stroke brings the most "new" hardware to the 2020 heavy-duty engine segment, via a compacted-graphite-iron block and stronger rotating assembly, bearings, aluminum cylinder heads and redesigned intake manifold, electronically actuated turbocharger, and updated fueling (Bosch injectors and 36,000-psi injection pressure).
SPECIFICATIONS
Engine: 6.7L Power Stroke
Displacement: 6.7L (406 ci)
Configuration: V-8
Power: 450 hp @ 2,800 rpm
Torque: 1,050 lb-ft @ 1,800 rpm
Turbocharging: Single variable-geometry turbocharger
Bore x stroke: 3.90 x 4.25 inches
Compression ratio: 16.2:1
Valvetrain: OHV with four valves per cylinder
Head Material: Aluminum alloy
Block Material: Compacted graphite iron
Transmission: Ten-speed automatic
Photo 7/7   |   006 Cummins Duramax Powerstroke Web Power Stroke Engine

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