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A Decade of Cummins, Duramax, and Power Stroke Diesel Engines

10 Years of Diesel Dominance

Jun 15, 2015
During the 10 years Diesel Power has existed, the engines offered in ¾- and 1-ton trucks have evolved to make more and more horsepower and torque. While a little more than 300 hp and 600 lb-ft of torque offered straight from the factory in 2005 seemed like massive power, the current highest ratings are a whopping 440 hp for the Ford Power Stroke and 865 lb-ft of torque for the Cummins engine in the Ram—and these clean-diesel torque wars don’t show any signs of slowing down. Here’s how everything has played out during our first 10 years. (For this timeline, we will be referring to the model years of engines, as opposed to calendar years, to avoid confusion.)
2005 – The Debut of Diesel Power
The first issue of Diesel Power hit newsstands and the web at a pivotal time in the history of diesel engines. The common-rail Cummins in the Dodge Ram was able to make 610 lb-ft of torque and meet 50-state emissions ratings without the need for an EGR system, the common-rail Duramax was entering its second generation with a new variable-geometry turbocharger and 605 lb-ft of torque, and Ford’s 6.0L Power Stroke engine was using a mix of VGT technology and non-common-rail fueling to create 325 hp—and lots of conversations about its durability.
Photo 2/9   |   5 9l Cummins
5.9L Cummins
Displacement: 5.9L (359ci)
Layout: I-6
Power: 325 hp at 2,900 rpm
Torque: 610 lb-ft at 1,600 rpm
Bore x Stroke: 4.02x4.72 inches (102x120mm)
Valvetrain: OHV with four valves per cylinder
Fuel Injection: High-pressure common-rail with Bosch CP3 pump
Induction: Holset fixed-geometry turbocharger
Head Material: Cast iron
Block Material: Cast iron
Compression Ratio: 17.2:1
Emissions Systems: Diesel oxidation catalytic converter
Photo 3/9   |   6 6l Duramax
6.6L Duramax LLY
Displacement: 6.6L (403ci)
Layout: V-8 » Power: 310 hp at 3,000 rpm
Torque: 605 lb-ft at 1,600 rpm
Power: 300 hp at 3,000 rpm (manual transmission)
Torque: 520 lb-ft at 1,800 rpm (manual transmission)
Bore x Stroke: 4.06x3.90 inches (103x99mm)
Valvetrain: OHV four valves per cylinder
Fuel Injection: High-pressure common-rail with Bosch CP3 pump
Induction: Garrett variable-geometry turbocharger
Head Material: Cast aluminum
Block Material: Cast iron
Compression Ratio: 17.5:1
Emissions Systems: Cooled exhaust gas recirculation and diesel oxidation catalytic converter
Photo 4/9   |   6 0l Power Stroke
6.0L Power Stroke
Displacement: 6.0L (365ci)
Layout: V-8
Power: 325 hp at 3,300 rpm
Torque: 570 lb-ft at 2,000 rpm
Bore x Stroke: 3.74x4.13 inches (95x105mm)
Valvetrain: OHV with four valves per cylinder
Fuel Injection: High-pressure HEUI with Siemens pump
Induction: Garrett variable-geometry turbocharger
Head Material: Cast iron
Block Material: Cast iron
Compression Ratio: 18.0:1
Emissions Systems: Cooled exhaust gas recirculation and diesel oxidation catalyst
2006 – 6.6L Duramax LBZ Takes the Horsepower Crown
The third generation of the Duramax, the LBZ, quickly became one of the favorite engines for tuners thanks to a stronger block, larger connecting rods, a new piston design, lower compression ratio, and heads that could handle more pressure. This allowed GM to increase the factory power and torque outputs to a class-leading 360 hp and a Cummins-matching 650 lb-ft. Both the Ford and Ram engines continued to offer the same output as the previous year.
5.9L Cummins
Displacement: 5.9L (359ci)
Layout: I-6
Power: 325 hp at 2,900 rpm
Torque: 610 lb-ft at 1,600 rpm
Bore x Stroke: 4.02x4.72 inches (102x120mm)
Valvetrain: OHV with four valves per cylinder
Fuel Injection: High-pressure common-rail with Bosch CP3 pump
Induction: Holset fixed-geometry turbocharger
Head Material: Cast iron
Block Material: Cast iron
Compression Ratio: 17.2:1
Emissions Systems: Diesel oxidation catalytic converter
6.6L Duramax LBZ
Displacement: 6.6L (403ci)
Layout: V-8
Power: 360 hp at 3,200 rpm
Torque: 650 lb-ft at 1,600 rpm
Bore x Stroke: 4.06x3.90 inches (103x99mm)
Valvetrain: OHV four valves per cylinder
Fuel Injection: High-pressure common-rail with Bosch CP3 pump
Induction: Garrett variable-geometry turbocharger
Head Material: Cast aluminum
Block Material: Cast iron
Compression Ratio: 16.8:1
Emissions Systems: Cooled exhaust gas recirculation and diesel oxidation catalytic converter
6.0L Power Stroke
Displacement: 6.0L (365ci)
Layout: V-8
Power: 325 hp at 3,300 rpm
Torque: 570 lb-ft at 2,000 rpm
Bore x Stroke: 3.74x4.13 inches (95x105mm)
Valvetrain: OHV with four valves per cylinder
Fuel Injection: High-pressure HEUI with Siemens pump
Induction: Garrett variable-geometry turbocharger
Head Material: Cast iron
Block Material: Cast iron
Compression Ratio: 18.0:1
Emissions Systems: Cooled exhaust gas recirculation and diesel oxidation catalyst
2007 – 6.7L Cummins and 6.6L Duramax LMM Arrive
Dodge made a decisive move to head off 2010 emissions regulations at the pass. By increasing the displacement of the Cummins engine from 5.9L to 6.7L and introducing a cooled EGR system, new injection techniques, a variable-geometry turbocharger, and a diesel particulate filter (DPF), the company was able to meet the upcoming 2010 standards early. This allowed Chrysler to build up EPA emissions credits that could be used during future model years. During the later part of the ’07 model year, GM introduced the 6.6L Duramax LMM engine, which made 365 hp and 660 lb-ft, even with the addition of a DPF. The LMM was equipped in the all-new generation of GMT900 trucks, produced alongside ’07 2500HD/3500HD “Classic” models with the old body style and the LBZ engine. Ford continued offering the 6.0L Power Stroke for one more year.
Photo 5/9   |   6 7l Cummins
6.7L Cummins
Displacement: 6.7L (408ci)
Layout: I-6
Power: 350 hp at 3,013 rpm
Torque: 650 lb-ft at 1,500 rpm
Power: 350 hp at 3,013 rpm (manual transmission)
Torque: 610 lb-ft at 1,500 rpm (manual transmission)
Bore x Stroke: 4.21x4.88 inches (107x124mm)
Valvetrain: OHV with four valves per cylinder
Fuel Injection: High-pressure common-rail with Bosch CP3 pump
Induction: Holset variable-geometry turbocharger
Head Material: Cast iron
Block Material: Cast iron
Compression Ratio: 17.3:1
Emissions Systems: Cooled exhaust gas recirculation, diesel oxidation catalyst, and diesel particulate filter
Photo 6/9   |   6 6l Duramax
6.6L Duramax LMM
Displacement: 6.6L (403ci)
Layout: V-8
Power: 365 hp at 3,200 rpm
Torque: 660 lb-ft at 1,600 rpm
Bore x Stroke: 4.06x3.90 inches (103x99mm)
Valvetrain: OHV four valves per cylinder
Fuel Injection: High-pressure common-rail with Bosch CP3 pump
Induction: Garrett variable-geometry turbocharger
Head Material: Cast aluminum
Block Material: Cast iron
Compression Ratio: 16.8:1
Emissions Systems: Cooled exhaust gas recirculation, diesel oxidation catalytic converter, and diesel particulate filter
6.0L Power Stroke
Displacement: 6.0L (365ci)
Layout: V-8
Power: 325 hp at 3,300 rpm
Torque: 570 lb-ft at 2,000 rpm
Bore x Stroke: 3.74x4.13 inches (95x105mm)
Valvetrain: OHV with four valves per cylinder
Fuel Injection: High-pressure HEUI with Siemens pump
Induction: Garrett variable-geometry turbocharger
Head Material: Cast iron
Block Material: Cast iron
Compression Ratio: 18.0:1
Emissions Systems: Cooled exhaust gas recirculation and diesel oxidation catalyst
2008 – The 6.4L Power Stroke Replaces the 6.0L
While Ford and Navistar International went to court over warranty claims about the 6.0L Power Stroke engine, they were already in the process of developing the 6.4L powerplant that debuted very early in the ’08 model year. It used numerous design upgrades over the previous engine, including common-rail fueling and a compound series sequential turbocharger setup to make 350 hp and 650 lb-ft—even with the use of a diesel particulate filter. That DPF became infamous when a video appeared on YouTube showing flames shooting out the tailpipe of a Super Duty truck at a dealership. Ford quickly initiated a voluntary safety recall (NHTSA 07S49) that altered the programming “to prevent the occurrence of excessive heat in the exhaust system or potential flame from the tailpipe.” Both the 6.7L Cummins and 6.6L Duramax LML engines maintained the same basic designs and power outputs.
6.7L Cummins
Displacement: 6.7L (408ci)
Layout: I-6
Power: 350 hp at 3,013 rpm
Torque: 650 lb-ft at 1,500 rpm
Power: 350 hp at 3,013 rpm (manual transmission)
Torque: 610 lb-ft at 1,500 rpm (manual transmission)
Bore x Stroke: 4.21x4.88 inches (107x124mm)
Valvetrain: OHV with four valves per cylinder
Fuel Injection: High-pressure common-rail with Bosch CP3 pump
Induction: Holset variable-geometry turbocharger
Head Material: Cast iron
Block Material: Cast iron
Compression Ratio: 17.3:1
Emissions Systems: Cooled exhaust gas recirculation, diesel oxidation catalyst, and diesel particulate filter
6.6L Duramax LMM
Displacement: 6.6L (403ci)
Layout: V-8
Power: 365 hp at 3,200 rpm
Torque: 660 lb-ft at 1,600 rpm
Bore x Stroke: 4.06x3.90 inches (103x99mm)
Valvetrain: OHV four valves per cylinder
Fuel Injection: High-pressure common-rail with Bosch CP3 pump
Induction: Garrett variable-geometry turbocharger
Head Material: Cast aluminum
Block Material: Cast iron
Compression Ratio: 16.8:1
Emissions Systems: Cooled exhaust gas recirculation, diesel oxidation catalytic converter, and diesel particulate filter
Photo 7/9   |   2008 PowerStroke
6.4L Power Stroke
Displacement: 6.4L (390ci)
Layout: V-8
Power: 350 hp at 3,000 rpm
Torque: 650 lb-ft at 2,000 rppm
Bore x Stroke: 3.87x4.13 inches (98x105mm)
Valvetrain: OHV with four valves per cylinder
Fuel Injection: High-pressure common-rail with Siemens K16 pump
Induction: BorgWarner series sequential variable-geometry and fixed turbochargers
Head Material: Cast iron
Block Material: Cast iron
Compression Ratio: 17.5:1
Emissions Systems: Cooled exhaust gas recirculation, diesel oxidation catalyst, and diesel particulate filter
"The DPF on the ’08 Super Duty became infamous when a video appeared on YouTube showing flames shooting out the tailpipe...."
2009
6.7L Cummins
Displacement: 6.7L (408ci)
Layout: I-6
Power: 350 hp at 3,013 rpm
Torque: 650 lb-ft at 1,500 rpm
Power: 350 hp at 3,013 rpm (manual transmission)
Torque: 610 lb-ft at 1,500 rpm (manual transmission)
Bore x Stroke: 4.21x4.88 inches (107x124mm)
Valvetrain: OHV with four valves per cylinder
Fuel Injection: High-pressure common-rail with Bosch CP3 pump
Induction: Holset variable-geometry turbocharger
Head Material: Cast iron
Block Material: Cast iron
Compression Ratio: 17.3:1
Emissions Systems: Cooled exhaust gas recirculation, diesel oxidation catalyst, and diesel particulate filter
6.6L Duramax LMM
Displacement: 6.6L (403ci)
Layout: V-8
Power: 365 hp at 3,200 rpm
Torque: 660 lb-ft at 1,600 rpm
Bore x Stroke: 4.06x3.90 inches (103x99mm)
Valvetrain: OHV four valves per cylinder
Fuel Injection: High-pressure common-rail with Bosch CP3 pump
Induction: Garrett variable-geometry turbocharger
Head Material: Cast aluminum
Block Material: Cast iron
Compression Ratio: 16.8:1
Emissions Systems: Cooled exhaust gas recirculation, diesel oxidation catalytic converter, and diesel particulate filter
6.4L Power Stroke
Displacement: 6.4L (390ci)
Layout: V-8
Power: 350 hp at 3,000 rpm
Torque: 650 lb-ft at 2,000 rppm
Bore x Stroke: 3.87x4.13 inches (98x105mm)
Valvetrain: OHV with four valves per cylinder
Fuel Injection: High-pressure common-rail with Siemens K16 pump
Induction: BorgWarner series sequential variable-geometry and fixed turbochargers
Head Material: Cast iron
Block Material: Cast iron
Compression Ratio: 17.5:1
Emissions Systems: Cooled exhaust gas recirculation, diesel oxidation catalyst, and diesel particulate filter
2010
6.7L Cummins
Displacement: 6.7L (408ci)
Layout: I-6
Power: 350 hp at 3,013 rpm
Torque: 650 lb-ft at 1,500 rpm
Power: 350 hp at 3,013 rpm (manual transmission)
Torque: 610 lb-ft at 1,500 rpm (manual transmission)
Bore x Stroke: 4.21x4.88 inches (107x124mm)
Valvetrain: OHV with four valves per cylinder
Fuel Injection: High-pressure common-rail with Bosch CP3 pump
Induction: Holset variable-geometry turbocharger
Head Material: Cast iron
Block Material: Cast iron
Compression Ratio: 17.3:1
Emissions Systems: Cooled exhaust gas recirculation, diesel oxidation catalyst, and diesel particulate filter
6.6L Duramax LMM
Displacement: 6.6L (403ci)
Layout: V-8
Power: 365 hp at 3,200 rpm
Torque: 660 lb-ft at 1,600 rpm
Bore x Stroke: 4.06x3.90 inches (103x99mm)
Valvetrain: OHV four valves per cylinder
Fuel Injection: High-pressure common-rail with Bosch CP3 pump
Induction: Garrett variable-geometry turbocharger
Head Material: Cast aluminum
Block Material: Cast iron
Compression Ratio: 16.8:1
Emissions Systems: Cooled exhaust gas recirculation, diesel oxidation catalytic converter, and diesel particulate filter
Displacement: 6.4L (390ci)
Layout: V-8
Power: 350 hp at 3,000 rpm
Torque: 650 lb-ft at 2,000 rppm
Bore x Stroke: 3.87x4.13 inches (98x105mm)
Valvetrain: OHV with four valves per cylinder
Fuel Injection: High-pressure common-rail with Siemens K16 pump
Induction: BorgWarner series sequential variable-geometry and fixed turbochargers
Head Material: Cast iron
Block Material: Cast iron
Compression Ratio: 17.5:1
Emissions Systems: Cooled exhaust gas recirculation, diesel oxidation catalyst, and diesel particulate filter
2011 – All-New Ford 6.7L Scorpion, New 6.6L Duramax LML, and Cummins Torque Bump
After parting ways with Navistar International, Ford came out with its own completely new engine that used the code name Scorpion during development. Unlike the all-iron 6.0L and 6.4L engines, the 6.7L used a compacted graphite iron (CGI) block and reversed aluminum heads to send exhaust directly into a single-sequential turbocharger, which has two compressor wheels mounted back to back on a shaft that’s turned by a single turbine wheel. The engine also included the injection of diesel exhaust fluid to meet emissions requirements. It initially debuted with 390 hp and 735 lb-ft of torque, but that was soon increased to 400 hp and 800 lb-ft of torque with a free factory programming upgrade. For 2011, Ram used a software upgrade that greatly increased the torque output of the 6.7L Cummins to 800 lb-ft. The same year, GM introduced the 6.6L Duramax LML with DEF injection that made 397 hp and 765 lb-ft of torque.
6.7L Cummins
Displacement: 6.7L (408ci)
Layout: I-6
Power: 350 hp at 3,013 rpm
Torque: 800 lb-ft at 1,600 rpm
Power: 350 hp at 3,013 rpm (manual transmission)
Torque: 610 lb-ft at 1,500 rpm (manual transmission)
Bore x Stroke: 4.21x4.88 inches (107x124mm)
Valvetrain: OHV with four valves per cylinder
Fuel Injection: High-pressure common-rail with Bosch CP3 pump
Induction: Holset variable-geometry turbocharger
Head Material: Cast iron
Block Material: Cast iron
Compression Ratio: 17.3:1
Emissions Systems: Cooled exhaust gas recirculation, diesel oxidation catalyst, and diesel particulate filter
Photo 8/9   |   2011 Duramax
6.6L Duramax LML
Displacement: 6.6L (403ci)
Layout: V-8
Power: 397 hp at 3,000 rpm
Torque: 765 lb-ft at 1,600 rpm
Bore x Stroke: 4.06x3.90 inches (103x99mm)
Valvetrain: OHV four valves per cylinder
Fuel Injection: High-pressure common-rail with Bosch CP4.2 pump
Induction: Garrett variable-geometry turbocharger
Head Material: Cast aluminum
Block Material: Cast iron
Compression Ratio: 16.0:1
Emissions Systems: Cooled exhaust gas recirculation, diesel oxidation catalytic converter, diesel particulate filter, and selective catalytic reduction with diesel exhaust fluid
6.7L Power Stroke
Displacement: 6.7L (406ci)
Layout: V-8
Power: 400 hp at 2,800 rpm
Torque: 800 lb-ft at 1,600 rpm
Power: 390 hp at 2,800 rpm (initial power rating)
Torque: 735 lb-ft at 1,600 rpm (initial torque rating)
Power: 400 hp at 2,800 rpm (after programming update)
Torque: 800 lb-ft at 1,600 rpm (after programming update)
Bore x Stroke: 3.90x4.25 inches (99x108mm)
Valvetrain: OHV with four valves per cylinder
Fuel Injection: High-pressure common-rail with Bosch CP4.2 pump
Induction: Garrett single-sequential variable-geometry turbocharger
Head Material: Cast aluminum
Block Material: Compacted graphite iron (CGI)
Compression ratio: 16.2:1
Emissions Systems: Cooled exhaust gas recirculation, diesel oxidation catalytic converter, diesel particulate filter, and selective catalytic reduction with diesel exhaust fluid
2012
6.7L Cummins
Displacement: 6.7L (408ci)
Layout: I-6
Power: 350 hp at 3,013 rpm
Torque: 800 lb-ft at 1,600 rpm
Power: 350 hp at 3,013 rpm (manual transmission)
Torque: 610 lb-ft at 1,500 rpm (manual transmission)
Bore x Stroke: 4.21x4.88 inches (107x124mm)
Valvetrain: OHV with four valves per cylinder
Fuel Injection: High-pressure common-rail with Bosch CP3 pump
Induction: Holset variable-geometry turbocharger
Head Material: Cast iron
Block Material: Cast iron
Compression Ratio: 17.3:1
Emissions Systems: Cooled exhaust gas recirculation, diesel oxidation catalyst, and diesel particulate filter
6.6L Duramax LML
Displacement: 6.6L (403ci)
Layout: V-8
Power: 397 hp at 3,000 rpm
Torque: 765 lb-ft at 1,600 rpm
Bore x Stroke: 4.06x3.90 inches (103x99mm)
Valvetrain: OHV four valves per cylinder
Fuel Injection: High-pressure common-rail with Bosch CP4.2 pump
Induction: Garrett variable-geometry turbocharger
Head Material: Cast aluminum
Block Material: Cast iron
Compression Ratio: 16.0:1
Emissions Systems: Cooled exhaust gas recirculation, diesel oxidation catalytic converter, diesel particulate filter, and selective catalytic reduction with diesel exhaust fluid
6.7L Power Stroke
Displacement: 6.7L (406ci)
Layout: V-8
Power: 400 hp at 2,800 rpm
Torque: 800 lb-ft at 1,600 rpm
Bore x Stroke: 3.90x4.25 inches (99x108mm)
Valvetrain: OHV with four valves per cylinder
Fuel Injection: High-pressure common-rail with Bosch CP4.2 pump
Induction: Garrett single-sequential variable-geometry turbocharger
Head Material: Cast aluminum
Block Material: Compacted graphite iron (CGI)
Compression Ratio: 16.2:1
Emissions Systems: Cooled exhaust gas recirculation, diesel oxidation catalytic converter, diesel particulate filter, and selective catalytic reduction with diesel exhaust fluid
2013 – 6.7L Cummins Finally Gets DEF
Since Ram Trucks (no longer under the Dodge banner) had built up credits with the EPA by meeting 2010’s emissions standards by 2007, it was able to delay the use of DEF in its trucks until 2013. While many people decried the addition of DEF, the Cummins engine helped prove that it could be an advantage by allowing the engineers to program the engine to make more power while producing fewer emissions and needing fewer mpg-killing DPF regenerations. With the addition of the heavy-duty Aisin AS69RC six-speed automatic transmission, the Cummins’ maximum ratings increased to 385 hp and a class-leading 850 lb-ft of torque. The 6.7L Power Stroke and 6.6L Duramax LML engines retained the same power and torque ratings.
6.7L Cummins
Displacement: 6.7L (408ci)
Layout: I-6
Power: 370 hp at 2,800 rpm (68RFE automatic transmission)
Torque: 800 lb-ft at 1,700 rpm (68RFE automatic transmission)
Power: 385 hp at 2,800 rpm (Aisin AS69RC automatic transmission)
Torque: 850 lb-ft at 1,700 rpm (Aisin AS69RC automatic transmission)
Power: 350 hp at 2,800 rpm (manual transmission)
Torque: 660 lb-ft at 1,500 rpm (manual transmission)
Bore x Stroke: 4.21x4.88 inches (107x124mm)
Valvetrain: OHV with four valves per cylinder
Fuel Injection: High-pressure common-rail with Bosch CP3 pump
Induction: Holset variable-geometry turbocharger
Head Material: Cast iron
Block Material: Cast iron
Compression Ratio: 17.3:1
Emissions Systems: Cooled exhaust gas recirculation, diesel oxidation catalyst, diesel particulate filter, and selective catalytic reduction with diesel exhaust fluid
6.6L Duramax LML
Displacement: 6.6L (403ci)
Layout: V-8
Power: 397 hp at 3,000 rpm
Torque: 765 lb-ft at 1,600 rpm
Bore x Stroke: 4.06x3.90 inches (103x99mm)
Valvetrain: OHV four valves per cylinder
Fuel Injection: High-pressure common-rail with Bosch CP4.2 pump
Induction: Garrett variable-geometry turbocharger
Head Material: Cast aluminum
Block Material: Cast iron
Compression Ratio: 16.0:1
Emissions Systems: Cooled exhaust gas recirculation, diesel oxidation catalytic converter, diesel particulate filter, and selective catalytic reduction with diesel exhaust fluid
6.7L Power Stroke
Displacement: 6.7L (406ci)
Layout: V-8
Power: 400 hp at 2,800 rpm
Torque: 800 lb-ft at 1,600 rpm
Bore x Stroke: 3.90x4.25 inches (99x108mm)
Valvetrain: OHV with four valves per cylinder
Fuel Injection: High-pressure common-rail with Bosch CP4.2 pump
Induction: Garrett single-sequential variable-geometry turbocharger
Head Material: Cast aluminum
Block Material: Compacted graphite iron (CGI)
Compression Ratio: 16.2:1
Emissions Systems: Cooled exhaust gas recirculation, diesel oxidation catalytic converter, diesel particulate filter, and selective catalytic reduction with diesel exhaust fluid
"With the addition of the heavy-duty Aisin AS69RC six-speed automatic transmission, the Cummins’ maximum ratings increased to 385hp and a class-leading 850 lb-ft of torque"
2014
6.7L Cummins
Displacement: 6.7L (408ci)
Layout: I-6 » Power: 370 hp at 2,800 rpm (68RFE automatic transmission)
Torque: 800 lb-ft at 1,700 rpm (68RFE automatic transmission)
Power: 385 hp at 2,800 rpm (Aisin AS69RC automatic transmission)
Torque: 850 lb-ft at 1,700 rpm (Aisin AS69RC automatic transmission)
Power: 350 hp at 2,800 rpm (manual transmission)
Torque: 660 lb-ft at 1,500 rpm (manual transmission)
Bore x Stroke: 4.21x4.88 inches (107x124mm)
Valvetrain: OHV with four valves per cylinder
Fuel Injection: High-pressure common-rail
Induction: Holset variable-geometry turbocharger
Head Material: Cast iron
Block Material: Cast iron
Compression Ratio: 17.3:1
Emissions Systems: Cooled exhaust gas recirculation, diesel oxidation catalyst, diesel particulate filter, and selective catalytic reduction with diesel exhaust fluid
6.6L Duramax LML
Displacement: 6.6L (403ci)
Layout: V-8
Power: 397 hp at 3,000 rpm
Torque: 765 lb-ft at 1,600 rpm
Bore x Stroke: 4.06x3.90 inches (103x99mm)
Valvetrain: OHV four valves per cylinder
Fuel Injection: High-pressure common-rail with Bosch CP4.2 pump
Induction: Garrett variable-geometry turbocharger
Head Material: Cast aluminum
Block Material: Cast iron
Compression Ratio: 16.0:1
Emissions Systems: Cooled exhaust gas recirculation, diesel oxidation catalytic converter, diesel particulate filter, and selective catalytic reduction with diesel exhaust fluid
6.7L Power Stroke
Displacement: 6.7L (406ci)
Layout: V-8
Power: 400 hp at 2,800 rpm
Torque: 800 lb-ft at 1,600 rpm
Bore x Stroke: 3.90x4.25 inches (99x108mm)
Valvetrain: OHV with four valves per cylinder
Fuel Injection: High-pressure common-rail with Bosch CP4.2 pump
Induction: Garrett single-sequential variable-geometry turbocharger
Head Material: Cast aluminum
Block Material: Compacted graphite iron (CGI)
Compression Ratio: 16.2:1
Emissions Systems: Cooled exhaust gas recirculation, diesel oxidation catalytic converter, diesel particulate filter, and selective catalytic reduction with diesel exhaust fluid
2015 – Second-Gen 6.7L Power Stroke and 865-lb-ft Cummins
The second generation of the 6.7L Power Stroke swapped the dual-compressor turbocharger for a large, single variable-geometry turbo, upgraded injector tips, and a new “cobra head” downpipe to increase output to a class-leading 440 hp and 860 lb-ft of torque. Not to be outdone, Ram upped the maximum torque rating of the 6.7L Cummins to 865 lb-ft of torque for trucks with the Aisin transmission. Meanwhile, General Motors continues to offer the LML with 397 hp and 765 lb-ft of torque, but there are rumors a significantly redesigned Duramax engine could debut as soon as 2016.
6.7L Cummins
Displacement: 6.7L (408ci)
Layout: I-6
Power: 370 hp at 2,800 rpm (68RFE automatic transmission)
Torque: 800 lb-ft at 1,700 rpm (68RFE automatic transmission)
Power: 385 hp at 2,800 rpm (Aisin AS69RC automatic transmission)
Torque: 865 lb-ft at 1,700 rpm (Aisin AS69RC automatic transmission)
Power: 350 hp at 2,800 rpm (manual transmission)
Torque: 660 lb-ft at 1,500 rpm (manual transmission)
Bore x Stroke: 4.21x4.88 inches (107x124mm)
Valvetrain: OHV with four valves per cylinder
Fuel Injection: High-pressure common-rail with Bosch CP3 pump
Induction: Holset variable-geometry turbocharger
Head Material: Cast iron
Block Material: Cast iron
Compression Ratio: 17.3:1
Emissions Systems: Cooled exhaust gas recirculation, diesel oxidation catalyst, diesel particulate filter, and selective catalytic reduction with diesel exhaust fluid
6.6L Duramax LML
Displacement: 6.6L (403ci)
Layout: V-8
Power: 397 hp at 3,000 rpm
Torque: 765 lb-ft at 1,600 rpm
Bore x Stroke: 4.06x3.90 inches (103x99mm)
Valvetrain: OHV four valves per cylinder
Fuel Injection: High-pressure common-rail with Bosch CP4.2 pump
Induction: Garrett variable-geometry turbocharger
Head Material: Cast aluminum
Block Material: Cast iron
Compression Ratio: 16.0:1
Emissions Systems: Cooled exhaust gas recirculation, diesel oxidation catalytic converter, diesel particulate filter, and selective catalytic reduction with diesel exhaust fluid
Photo 9/9   |   2015 Power Stroke
6.7L Power Stroke
Displacement: 6.7L (406ci)
Layout: V-8
Power: 440 hp at 2,800 rpm
Torque: 860 lb-ft at 1,600 rpm
Bore x Stroke: 3.90x4.25 inches (99x108mm)
Valvetrain: OHV with four valves per cylinder
Fuel Injection: High-pressure common-rail with Bosch CP4.2 pump
Induction: Garrett single variable-geometry turbocharger
Head Material: Cast aluminum
Block Material: Compacted graphite iron (CGI)
Compression Ratio: 16.2:1
Emissions Systems: Cooled exhaust gas recirculation, diesel oxidation catalytic converter, diesel particulate filter, and selective catalytic reduction with diesel exhaust fluid

Sources

Ford Motor Company
Dearborn, MI 48126
800-392-3673
www.ford.com
Chevrolet
Detroit, MI 48323
www.chevrolet.com
Ram Trucks
Aubum Hills, MI 48321
800-726-4636
www.ramtrucks.com
GMC
888-988-7267
http://www.gmc.com

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