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Duramax V8 engine
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The Duramax is General Motors' diesel engine family for large trucks, designed by Isuzu. The 6.6 liter Duramax is produced by DMAX, a joint venture between GM and Isuzu in Moraine, Ohio. In 2006, production at Moraine was reportedly limited to approximately 200,000 engines per year. On May 9, 2007, DMAX announced the production of the 1,000,000th Duramax V-8 Diesel Engine at its Moraine facility.
The 6.6 liter Duramax engine is the most reliable HD Pickup Truck diesel engine in the market according to the result of independent customer surveys.
LG4, or 6H, is an inline-six cylinder engine.
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Encyclopedia
The Duramax is General Motors' diesel engine family for large trucks, designed by Isuzu. The 6.6 liter Duramax is produced by DMAX, a joint venture between GM and Isuzu in Moraine, Ohio. In 2006, production at Moraine was reportedly limited to approximately 200,000 engines per year. On May 9, 2007, DMAX announced the production of the 1,000,000th Duramax V-8 Diesel Engine at its Moraine facility.
The 6.6 liter Duramax engine is the most reliable HD Pickup Truck diesel engine in the market according to the result of independent customer surveys.
LG4
The LG4, or 6H, is an inline-six cylinder engine. It is a commercial-grade vehicle engine and is currently operating in over 300,000 Isuzu and GM-built trucks, including the H-Series and T-series vehicles. It is mated to the Allison 3000 and 3500 Series transmissions.
The following trucks use the LG4:
- Chevrolet T-Series
- Isuzu F-Series
- Isuzu H-Series
Specifications
- Engine description: 7.8 L I6 Turbodiesel; 6H
- Displacement:
- Bore and stroke: 4.53 / 4.92 (in)
- Block / Head: Cast iron / Cast aluminum
- Aspiration: Turbocharged & Intercooled
- Valvetrain: OHC 4-V
- Compression: 16.0:1
- Common-rail
- Power / Torque: @ 2,200 rpm / @ 1,450 rpm (Standard)
- Power / Torque: @ 2,200 rpm / @ 1,450 rpm (High-Torque Version)
- Source:
LB7
The LB7 (engine code "1") was first introduced in 2001 and continued until 2004. The V8 engine is a and it has and of torque. It is a 32-valve design with high-pressure common-rail direct injection and aluminum cylinder heads. The most problematic issue with the Lb7 are injectors going bad. GM issued a warranty for this and currently injectors and warrantied for 7 years/200,000 miles. The Duramax was on the Ward's 10 Best Engines list in 2001 and 2002.
The following trucks use the LB7:
Specifications
- Engine Description: LB7
- Displacement:
- Bore x Stroke: 4.06 in (103 mm) x 3.90 in (99 mm)
- Block / Head: Cast gray iron / Cast aluminum
- Aspiration: Turbocharged & Intercooled
- Valvetrain: OHV 4-V
- Compression: 17.5:1
- Injection: Direct; Bosch High Pressure Common-rail
- Power / Torque: @ 3,100 rpm / @ 1,800 rpm
- Source:
LLY
The LLY (internally called the 8GF1) (engine code "2") is a turbocharged engine which debuted in 2004 and continued until the end of 2005. It is a 32-valve design with high-pressure common-rail direct injection and aluminum cylinder heads. Output is at 3100 rpm and at 1800 rpm. 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 they installed an Exhaust Gas Recirculation valve or (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, and preventing leaked fuel from entering the crankcase, causing oil dilution. Early on problems came forward from customers complaining of severe overheating, and also in some situations blown head gaskets. Initially GM denied that it was a problem, but after it was sued by a consumer group it relented and included overheating and blown head gaskets as a warranted item.
The following trucks used the LLY engine:
Specifications
- Engine Code: LLY
- Displacement:
- Block / Head: Cast gray iron / Cast aluminum
- Aspiration: Turbocharged & Intercooled
- Valvetrain: OHV 4-V
- Compression: 17.5:1
- Injection: Direct; Bosch High Pressure Common-rail
- Power / Torque: @ 3,000 rpm / @ 1,800 rpm
- Head casting is 8gf1
- Block casting is #22351021213
- Source:
2006 LLY
The 2006 LLY (engine code "2") debuted in the beginning of 2006 and ended production with the start of the 2007 calander year. Mechanically it is identical to the LBZ and is mated to the new 6 speed Allison transmission however it retained the LLY designation. Its output is at 3200 rpm and torque is at 1600 rpm. Huge changes were made for the 06 LLY Per GM they are:
"* Cylinder block casting and machining changes strengthen the bottom of the cylinder bores to support increased power and torque
- Upgraded main bearing material increases durability
- Revised piston design helps lower compression ratio to 16.8:1 from 17.5:1
- Piston pin bore diameter increased for increased strength
- Connecting rod “ I ” section is thicker for increased strength
- Cylinder heads revised to accommodate lower compression and reduced cylinder firing pressure
- Maximum injection pressure increased from 23,000 psi to more than 26,000 psi
- Fuel delivered via higher-pressure pump, fuel rails, distribution lines and all-new, seven-hole fuel injectors
- Fuel injectors spray directly onto glow plugs, providing faster, better-quality starts and more complete cold-start combustion for reduced emissions
- Improved glow plugs heat up faster through an independent controller
- Revised variable-geometry turbocharger is aerodynamically more efficient to help deliver smooth and immediate response and lower emissions
- Air induction system re-tuned to enhance quietness
- EGR has larger cooler to bring more exhaust into the system
- First application of new, 32-bit E35 controller, which adjusts and compensates for the fuel flow to bolster efficiency and reduce emissions"
The following trucks have the 06 LLY engine:
Specifications
- Engine Code: LLY
- Displacement:
- Bore x Stroke: 4.06 in (103 mm) x 3.90 in (99 mm)
- Block / Head: Cast gray iron / Cast aluminum
- Aspiration: Turbocharged & Intercooled
- Valvetrain: OHV 4-V
- Compression: 16.8:1
- Injection: Direct; Bosch High Pressure Common-rail
- Power / Torque: @ 3,200 rpm / @ 1,600 rpm
- Source:
LBZ
The LBZ (engine code "D") debuted in the later part of 2006 and continued into 2007 sold only in the "classic" body style. Its output is at 3200 rpm and torque is at 1600 rpm. The LBZ is mechanically identical to the 2006 LLY engine, however it has a more powerful tune loaded into the computer that allows it produce more power and torque. The LBZ is and will be known as the hot rod of diesel technology due to it being extremely powerful and able to be easily modified in contrast to the new diesels currently on the market that have stringent EPA regulations.
The following trucks have the LBZ engine:
- Chevrolet Silverado HD
- Chevrolet Kodiak
- GMC Sierra HD
- GMC TopKick
- Chevy Express full-size (reduced power output mated to a 4l80E transmission)
- GMC Savana full-size (reduced power output mated to a 4l80E transmission)
Specifications
- Engine Code: LBZ
- Displacement:
- Bore x Stroke: 4.06 in (103 mm) x 3.90 in (99 mm)
- Block / Head: Cast gray iron / Cast aluminum
- Aspiration: Turbocharged & Intercooled
- Valvetrain: OHV 4-V
- Compression: 16.8:1
- Injection: Direct; Bosch High Pressure Common-rail
- Power / Torque: @ 3,200 rpm / @ 1,600 rpm
- Source:
LMM
The LMM are nearly identical to the LBZ engine. It is a 6.6 L turbocharged engine and was introduced for the 2007.5 model year. Its output has seen a slight increase of and of torque over the LBZ. This makes it at 3200 rpm and ·ft·lbf of torque at 1600 rpm. It's mated to an Allison 1000 6-speed transmission. Engine performance curves can be found here :
The LMM Duramax 6.6L V-8 has new equipment to help it meet the US EPA mandated 2007 emission standards. The new standard requires a 90-percent reduction in particulate matter (PM), compared with the previous standard, implemented in 2004, and a 50-percent reduction in oxides of nitrogen (NOx). The use of reformulated, ultra-low sulfur diesel fuel, which went on sale nationwide in the fall of 2006, is required to meet the new emissions standard and prevent damage to the emissions equipment. In addition the LMM utilizes a Diesel Particulate Filter (DPF) to trap all soot emitted from the engine. The DPF traps particulate matter aka(black smoke), when the computer senses a pressure differential between two sensors (one located before and another after the DPF) the truck enters a "regeneration" during this time the computer commands the fuel injectors to inject fuel after the cylinder has fired forcing raw fuel into the DOC (Diesel Oxidizing Catalyst) where the fuel is burned to elevate the temperature of the exhaust. This hot exhaust flows into the DPF and burns the trapped soot.
Specifications
- Engine Description: LMM
- Displacement:
- Bore x Stroke: 4.06 in (103 mm) x 3.90 in (99 mm)
- Block / Head: Cast gray iron / Cast aluminum
- Aspiration: Turbocharged & Intercooled
- Valvetrain: OHV 4-V
- Compression: 16.8:1
- Injection: Direct; Bosch High Pressure Common Rail with CP3.3 Injection Pump
- Power / Torque: @ 3,200 rpm / @ 1,600 rpm
- Source:
To meet the new emissions regulation in the US, the LMM Duramax 6.6 L V-8 engine features:
- 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)
The following trucks have or are due to have the LMM engine:
LMK
General Motors plans a 4.5 litre 72-degree V8 for light-duty applications which will be built at GM's powertrain facility in Tonawanda, New York after 2009. Designed to fit in the same space as a Chevrolet Small-Block engine, it is expected to produce over and of torque. The small size should allow the engine to be used in a variety of applications, depending on market demand, though it would initially be targeted for the Chevy Silverado/GMC Sierra and Hummer H2.
Unlike previous Duramax engines, the 4.5 liter will be designed and built entirely by GM, without assistance from Isuzu.
See also
External links
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