Duramax V8 engine

Last updated
Duramax Diesel engine
1.19.2011LML.jpg
Duramax LML
Overview
Manufacturer DMAX Ltd.
Production2001–present
Layout
Configuration 90° V8
Displacement 6.6 L; 402.7 cu in (6,599 cc)
Cylinder bore 4.06 in (103 mm) [1]
Piston stroke 3.90 in (99 mm) [1]
Cylinder block materialCast gray iron
Cylinder head materialAluminum
Valvetrain OHV 4 valves x cyl.
Valvetrain drive system Gears
Compression ratio 16.8:1, 17.5:1
Combustion
Turbocharger Garrett variable-geometry vane with intercooler
Fuel system High-pressure common-rail direct injection
Management Bosch
Fuel type Diesel
Cooling system Water-cooled
Output
Power output 250–550 hp (186–410 kW)
Torque output 460–1,050 lb⋅ft (624–1,424 N⋅m)
Emissions
Emissions target standard EPA
Emissions control systems Oxidizing catalyst, DPF, EGR
Chronology
Predecessor 6.2 and 6.5 L Detroit Diesel

The Duramax V8 engine is a family of 6.6-liter diesel V8 engines produced by DMAX, a wholly owned subsidiary of General Motors in Moraine, Ohio. The Duramax block and heads are supplied from reliable vendors of General Motors.[ vague ] This engine was initially installed in 2001 Chevrolet and GMC trucks, and has since become an option in pickups, vans, and medium-duty trucks. In 2006, production at Moraine was reportedly limited to approximately 200,000 engines per year. [2] On May 9, 2007, DMAX announced the production of the 1,000,000th Duramax V8 at its Moraine facility, [2] followed by the 2,000,000th on March 24, 2017. [3]

Contents

Engine RPO codes

LB7

RPO LB7 (engine code "1") was first introduced in 2001 and continued until early 2004. It is a 32-valve design with high-pressure common-rail direct injection and an experimental composite design cylinder head.

The following trucks use the LB7:

Specifications

  • Block / Head: Cast Iron / Aluminum
  • Compression: 17.5:1
  • Injection: Direct; Bosch high-pressure common-rail
  • Power / Torque: 300 hp (224 kW) at 3,100 rpm / 520 lb⋅ft (705 N⋅m) at 1,800 rpm

The LLY was introduced in 2004 and completely replaced the LB7 by mid-year.

LLY

The LLY (internally called the 8GF1) (engine code "2") is a 6.6 L; 403.9 cu in (6,619 cc) turbocharged engine which debuted in mid-2004 and continued until the end of 2005 (except the Hummer H1 in 2006). It is a 32-valve design with high-pressure common-rail direct injection and aluminum cylinder heads. The LLY was GM's first attempt to implement emissions requirements on their diesel trucks. To meet this goal, they turned to a newly developed Garrett turbocharger with a variable geometry vane system and installed an EGR valve. Learning from problems with injectors in the previous LB7, GM changed the valve covers to allow access to the injectors without having to remove the valve covers, saving significant labor costs if injector replacement became necessary.

The following trucks used the LLY engine:

Specifications

[4]

  • Block / Head: Cast gray iron / Cast aluminum
  • Compression: 17.5:1
  • Injection: Bosch high-pressure common-rail
  • Power / Torque: 310 bhp (231 kW) at 3000 rpm / 605 lb⋅ft (820 N⋅m) at 1600 rpm
  • Head casting is 8GF1
  • Block casting is #22351021213

LLY/LBZ

There are two VIN codes for the LBZ. The first is VIN 2 produced in late 2005 and early 2006. The VIN 2 engine is mechanically and physically the same as the VIN D engine but utilizes LLY engine tuning due to the LBZ tuning taking longer to be EPA certified and placed into production.

The second is VIN D. This was introduced in 2006 and continued into 2007 sold only in the "classic" body style. It has an improved engine computer tune that produces increased power and torque over the 2005 LLY version of the engine. This also marked the first appearance of the Duramax in the Express/Savana vans. The LBZ is one of the more sought-after Duramax engines because of its strength, reliability, and being pre-emissions (DPF appeared on the next generation LMM in 2007).

Changes include:

LBZ applications:

LLY applications:

Specifications

[4]

  • Block / Head: Cast gray iron / Cast aluminum
  • Compression: 16.8:1
  • Injection: Bosch high-pressure common-rail
  • Power / Torque: 360 bhp @3200 rpm / 650 lb-ft @1600 rpm
CodeYearsPower outputTorqueRedline
LB7 (Chevrolet Silverado 2500HD / 3500 Classic (auto trans),
GMC Sierra 2500HD / 3500 Classic (auto trans))
2001–2004300 bhp (224 kW)
@ 3200 rpm
520 lb⋅ft (705 N⋅m)
@ 1600 rpm
3450 rpm
LLY (Chevrolet Kodiak Medium Duty (LRX option),
GMC TopKick Medium Duty (LRX option),
Hummer H1 Alpha)
2004–2005310 bhp (231 kW)
@ 3000 rpm
605 lb⋅ft (820 N⋅m)
@ 1600 rpm
3200 rpm
LBZ(Chevrolet Kodiak Medium Duty (LPD option),
GMC TopKick Medium Duty (LPD))
2006–2007605 lb⋅ft (820 N⋅m)
@ 1600 rpm
LLY (Chevrolet Express, GMC Savana)250 bhp (186 kW)
@ 3200 rpm
460 lb⋅ft (624 N⋅m)
@ 1600 rpm
3450 rpm

LMM

Allison 1000 attached to Duramax 6.6 Diesel Allison 1000 attached to Duramax 6.6 Diesel.JPG
Allison 1000 attached to Duramax 6.6 Diesel

The LMM (engine code "6") debuted part way through 2007 and ended production with the start of the 2011 calendar year and is mated to the 6-speed Allison transmission. The LMM was the only Duramax offered for model years 2007–2010. [5] A version was used in the Trident Iceni. [6]

Specifications

[7] [8]

  • Block / Head: Cast gray iron / Cast aluminum
  • Compression: 16.8:1
  • Injection: Bosch high-pressure common-rail with CP3.3 injection pump
  • Power / Torque: 365 bhp (272 kW) at 3200 rpm / 660 lb⋅ft (895 N⋅m) at 1600 rpm
CodeYearsPower outputTorqueRedline
LML (Chevrolet Silverado/GMC Sierra HD)2011–2016397 bhp (296 kW)
@ 3000 rpm
765 lb⋅ft (1,037 N⋅m)
@ 1600 rpm
3450 rpm
LMM (Chevrolet Silverado/GMC Sierra HD)2007–2010365 bhp (272 kW)
@ 3200 rpm
660 lb⋅ft (895 N⋅m)
@ 1600 rpm
LMM (Chevrolet Kodiak/GMC TopKick (LYE option))330 bhp (246 kW)
@ 3000 rpm
620 lb⋅ft (841 N⋅m)
@ 1600 rpm
3250 rpm
LMM (Chevrolet Kodiak/GMC TopKick (LRX option))300 bhp (224 kW)
@ 3000 rpm
520 lb⋅ft (705 N⋅m)
@ 1600 rpm
LMM (Chevrolet Express/GMC Savana)250 bhp (186 kW)
@ 3200 rpm
460 lb⋅ft (624 N⋅m)
@ 1600 rpm
3450 rpm
LGH (Chevrolet Express/GMC Savana)2010–2016260 bhp (194 kW)
@ 3100 rpm
525 lb⋅ft (712 N⋅m)
@ 1600 rpm

Emission controls:

  • Additional combustion control, including an even more efficient variable-geometry turbocharging system, cooled (enhanced) exhaust gas recirculation (EGR), and closed crankcase ventilation to reduce nitrogen oxides (NOx)
  • Additional exhaust control, including oxidizing catalyst and new diesel particulate filter (DPF) to reduce soot and particulate matter
  • Increased-capacity cooling system
  • New engine control software
  • Use of low-ash engine oil (CJ-4)

Applications:

LGH

The 6.6L Duramax diesel engine (VIN code "L") is used on 2010 interim and 2011 Chevrolet Express and GMC Savana vans and 2011 Chevrolet Silverado/GMC Sierra HD trucks with RPO ZW9 (chassis cabs or trucks with pickup box delete). The LGH engine is rated at 335 bhp (250 kW) at 3,100 rpm and 685 lb⋅ft (929 N⋅m) at 1,600 rpm. Similar to the LML, this engine also uses a DPF and DEF system to meet emissions standards.

LML

The 6.6L RPO LML (VIN code "8") is the 2011–2016 version of the Isuzu/GM Duramax V8 diesel engine. It is a further advanced version of the LMM engine with the majority of the changes addressing a required drastic reduction in engine emissions. Some mechanical aspects of the engine, such as piston oil flow design for improved temperature control and oil pump design, were also improved to enhance durability even further.

The LML engine was significantly updated for 2011 to comply with the new federal emissions standards for diesel engines, provide better engine rigidity, and further noise reduction. The engine gained new 29,000 PSI piezo injectors as well as a completely reworked fuel system which was now powered by the Bosch CP4 pump, that also now supports up to 20% biodiesel mixtures and a urea injection (to reduce nitrogen oxides) with a 5.3 gallon DEF tank. This engine has a fuel injector in the exhaust tract, to allow raw fuel injection during the particulate filter recycling routine. The RPO LML engine is rated at 397 hp (296 kW) at 3,000 rpm and 765 lb⋅ft (1,037 N⋅m) of torque at 1,600 rpm. [10]

L5P

The L5P Duramax is the latest version of the Duramax V8 diesel engine.(engine code Y). Introduced in the 2017 model year, it was the most powerful diesel engine GM had produced, with 445 hp (332 kW) at 2,800 rpm and 910 lb⋅ft (1,234 N⋅m) at 1,600 rpm. Design specification performance can exceed 550 bhp (410 kW) at 3,050 rpm and 1,050 lb⋅ft (1,424 N⋅m) at 1,975 rpm.

L5P Gen2

The L5P Duramax received an increase in horsepower and torque for the 2024 model year; 470 hp (350 kW) at 2,800 rpm and 975 lb⋅ft (1,322 N⋅m) at 1,600 rpm. Design specification performance can exceed 550 bhp (410 kW) at 3050 rpm and 1,050 lb⋅ft (1,424 N⋅m) at 1975 rpm. [11]

L5D

The L5D Duramax is a downrated version of the L5P for the Chevrolet Silverado MD and International CV trucks (Class 4, 5, and 6). The L5D was downrated to increase reliability and reduce downtime. The L5D was introduced in 2018 for the 2019 Chevrolet Silverado MD and International CV trucks. Specifications for the L5D are 350 hp (261 kW) at 2,600 rpm and 700 lb⋅ft (949 N⋅m) at 1,600 rpm.

Related Research Articles

<span class="mw-page-title-main">Chevrolet Silverado</span> Range of trucks manufactured by General Motors under Chevrolet

The Chevrolet Silverado is a range of trucks manufactured by General Motors under the Chevrolet brand. Introduced for the 1999 model year, the Silverado is the successor to the long-running Chevrolet C/K model line. Taking its name from the top trim level from the Chevrolet C/K series, the Silverado is offered as a series of full-size pickup trucks, chassis cab trucks, and medium-duty trucks. The fourth generation of the model line was introduced for the 2019 model year.

<span class="mw-page-title-main">General Motors LS-based small-block engine</span> Family of V8 and V6 engines

The General Motors LS-based small-block engines are a family of V8 and V6 engines designed and manufactured by American automotive company General Motors. First introduced in 1997, the family is a continuation of the earlier first- and second-generation Chevrolet small-block engine, of which over 100 million have been produced altogether, and is also considered to be one of the most popular V8 engines ever. Spanning three generations, a new, sixth generation is expected to enter production soon. Various small-block V8s were and still are available as crate engines.

<span class="mw-page-title-main">Chevrolet big-block engine</span> American V-8 car engine

The Chevrolet "big block" engine is a term for a series of large-displacement, naturally-aspirated, 90°, overhead valve, gasoline-powered, V8 engines; that were developed and produced by the Chevrolet Division of General Motors, from the 1950s until present.

<span class="mw-page-title-main">Chevrolet small-block engine (first- and second-generation)</span> Car engine

The Chevrolet small-block engine is a series of gasoline-powered V8 automobile engines, produced by the Chevrolet division of General Motors between 1954 and 2003, using the same basic engine block. Referred to as a "small-block" for its size relative to the physically much larger Chevrolet big-block engines, the small block family spanned from 262 cu in (4.3 L) to 400 cu in (6.6 L) in displacement. Engineer Ed Cole is credited with leading the design for this engine. The engine block and cylinder heads were cast at Saginaw Metal Casting Operations in Saginaw, Michigan.

<span class="mw-page-title-main">Chevrolet Express</span> Motor vehicle

The Chevrolet Express is a series of full-size vans produced by General Motors since 1996. The successor to the Chevrolet G-series van, the Express is produced in passenger and cargo variants. Alongside the standard van body, the line is offered as a cutaway van chassis; the latter vehicle is a chassis cab variant developed for commercial-grade applications, including ambulances, buses, motorhomes, and small trucks.

The 4L80-E is a series of automatic transmissions from General Motors. Designed for longitudinal engine configurations, the series included 4 forward gears. It was the 4-speed electronically commanded evolution of the 3-speed Turbo-Hydramatic 400, first produced in October 1963. 4L80-Es were optioned only in Chevrolet/GMC pickups, vans, and commercial vehicles, and the Hummer H1. It was also adopted by Rolls-Royce in 1991 and modified after extensive testing, and used initially in the Bentley Continental R, and subsequently other Rolls-Royce and Bentley vehicles. The 4L80 and 4L85 were built at Willow Run Transmission in Ypsilanti, Michigan.

The ZF S6-650 is a 6-speed manual transmission manufactured by ZF Friedrichshafen AG. It is designed for longitudinal engine applications, and is rated to handle up to 705 newton-metres (520 lbf⋅ft) of torque.

<span class="mw-page-title-main">Detroit Diesel V8 engine</span> Reciprocating internal combustion engine

The General Motors–Detroit Diesel V8 engine is a series of diesel V8 engines first introduced by General Motors for their C/K pickup trucks in 1982. Developed in collaboration with GM subsidiary Detroit Diesel, the engine family was produced by GM through 2002, when it was replaced by the new Duramax line. AM General's subsidiary General Engine Products (GEP) still produces a military variant of this engine for the HMMWV.

<span class="mw-page-title-main">Chevrolet Kodiak</span> Series of medium-duty trucks by General Motors

The Chevrolet Kodiak and GMC TopKick are a range of medium-duty trucks that were produced by the Chevrolet and GMC divisions of General Motors from 1980 to 2009. Introduced as a variant of the medium-duty C/K truck line, three generations were produced. Slotted between the C/K trucks and the GMC Brigadier Class 8 conventional, the Kodiak/TopKick were developed as a basis for vocationally oriented trucks, including cargo haulers, dump trucks, and similar vehicles; on later generations, both cutaway and cowled-chassis variants were produced for bus use.

<span class="mw-page-title-main">GMT800</span> Motor vehicle platform

The GMT800 was a General Motors full-size truck platform used from the 1999 through 2009 model years. It is the foundation for the Chevrolet Silverado and GMC Sierra pickups; and the derivative GMT820 and GMT830 versions for the Chevrolet Tahoe/GMC Yukon and the Chevrolet Suburban/GMC Yukon XL full-size SUVs, respectively. This platform was the successor to the GMT400 series of C/K pickups and SUVs, and was replaced for 2007 by the GMT900 line.

<span class="mw-page-title-main">Toyota KD engine</span> Reciprocating internal combustion engine

The Toyota KD engine series is a diesel engine produced by Toyota which appeared in 2000.

<span class="mw-page-title-main">GM 6L transmission</span> Automatic transmission family produced by General Motors

The 6L 50 is a 6-speed longitudinally-mounted automatic transmission produced by General Motors. It is very similar in design to the larger GM 6L 80 and 6L 90, and is produced at GM Powertrain plants in Toledo, Ohio; Silao, Guanajuato, Mexico; and by the independent Punch Powerglide company in Strasbourg, France.

<span class="mw-page-title-main">Chevrolet 90° V6 engine</span> Former American engine

The Chevrolet 90° V6 family of V6 engines began in 1978 with the Chevrolet 200 cu in (3.3 L) as the base engine for the all new 1978 Chevrolet Malibu. The original engine family was phased out in early 2014, with its final use as the 4.3 L (262 cu in) V6 engine used in Chevrolet and GMC trucks and vans. Its phaseout marks the end of an era of Chevrolet small-block engine designs dating back to the 1955 model year. A new Generation V 4.3 L (262 cu in) V6 variant entered production in late 2013, based on the LT1 small block V8 and first used in the 2014 Silverado/Sierra 1500 trucks.

<span class="mw-page-title-main">Fuso Trucks America</span> American regional subsidiary of Mitsubishi Fuso

Mitsubishi Fuso Truck of America, Inc. (MFTA) is a wholly owned subsidiary of Mitsubishi Fuso Truck and Bus Corporation (MFTBC), Kawasaki, Japan, itself a part of Daimler Truck based in Logan Township, New Jersey, United States. MFTA imported and marketed Class 3 through Class 5 medium-duty cabover trucks through more than 200 dealer locations in the United States and Canada, until 2021. As of 2019, MFTA imported and marketed diesel-powered, gas-powered, and electric trucks. According to the company, more than 100,000 Mitsubishi Fuso standard, 4-wheel-drive and crew cab trucks had been sold in the Canadian and U.S. markets since the company's founding. Applications included beverage, catering, refrigerated and dry cargo delivery, vehicle recovery, towing, pest control, plumbing, light construction and landscaping, overlanding, among others.

The Isuzu 6H is a family of inline six-cylinder diesel engines installed in Isuzu medium-duty trucks, and also installed in GM medium-duty trucks as the Duramax LG4. It is mated to the Allison 2500, 3000, and 3500 series transmissions.

The Duramax I6 engine is a diesel engine available in select models of General Motors light-duty trucks and SUVs. Applications include the Chevrolet Silverado/GMC Sierra 1500, Chevrolet Suburban/GMC Yukon XL, Chevrolet Tahoe/GMC Yukon, and Cadillac Escalade. The engine was developed together with Opel, who are manufacturing three- and four-cylinder versions displacing 1.5 and 2.0 liters, using the same engine architecture.

<span class="mw-page-title-main">Chevrolet Silverado (first generation)</span> GMT800 trucks by General Motors

The first generation of the Chevrolet Silverado is a series of trucks manufactured by General Motors from 1998 until 2007 under the Chevrolet brand and also as the GMC Sierra. Built on the new GMT800 platform, the Silverado/Sierra 1500 and 2500 pickup trucks were first released in August 1998 as 1999 models. The "classic" light-duty GMT400 C/K trucks were kept in production alongside the new types for the first model year, while the heavy-duty GMT400 pickups were continued until 2000, with the new GMT800 Silverado/Sierra HD released in model year 2001. A 3500 model was added later for 2001, with the introduction of the HD moniker. A refresh for 2003 models was introduced in 2002, bringing slight design changes and an upgrade to the audio and HVAC controls. The 2007 GMT800 trucks, built after the new GMT900 had gone on sale, used the name Classic to denote the difference between the two generations.

<span class="mw-page-title-main">Chevrolet Silverado (second generation)</span> GMT900 trucks by General Motors

The second generation of the Chevrolet Silverado is a series of trucks manufactured by General Motors from 2006 until 2013 under the Chevrolet brand, and also under the GMC brand as the GMC Sierra.

<span class="mw-page-title-main">Duramax I4 engine</span> Reciprocating internal combustion engine

The Duramax I4 engine is a family of turbocharged diesel I4 engines sold by General Motors in 2.5 and 2.8 liter sizes as an option for the Chevrolet Colorado, GMC Canyon, Chevrolet Express, and GMC Savana in southeast Asia and Oceania from 2012, and in North America from 2016 through 2022. They are closely related to the VM Motori R 425 and A 428, and were produced at the General Motors Thailand plant in Rayong.

References

  1. 1 2 "6.6L V-8 L5P Features & Specifications". GM Powered Solutions. Retrieved May 14, 2023.
  2. 1 2 "GM celebrates one-millionth Duramax diesel". Archived from the original on May 14, 2007. Retrieved May 9, 2007.
  3. "2 Millionth Duramax Diesel Engine Rolls off the Line". 24 March 2017.
  4. 1 2 2007 LLY LBZ spec sheet [ permanent dead link ]
  5. DuramaxHub (2016). "Duramax Engine Identification: Duramax Engine ID by VIN number" . Retrieved 14 December 2016.
  6. Korzeniewski, Jeremy (20 August 2008). "Trident diesel sports car not vaporware, still sounds too good to be true". Autoblog. Retrieved 14 December 2016.
  7. GM Media. "2007 Chevrolet Silverado 3500HD Specifications" . Retrieved 14 December 2016.
  8. 2009 GMC Sierra HD engine curve [ permanent dead link ]
  9. 2007 CHEVROLET SILVERADO AND GMC SIERRA HEAVY-DUTY PICKUPS DELIVER THE CAPABILITY FOR ANY TASK Archived 2007-03-03 at archive.today
  10. General Motors (10 March 2010). "GMC's 2011 Heavy-Duty Trucks Build On Proven Strong Heritage With New Duramax 6.6L Turbo Diesel Engines".
  11. "GM Authority". GM Engines.