Duramax V8 engine

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Duramax V8 engine
Manufacturer DMAX
Production: 2001–
Predecessor: 6.2 and 6.5 L Detroit Diesel

The Duramax is General Motors' diesel engine family for large trucks, designed by Isuzu. It is produced by DMAX, a joint venture between GM and Isuzu in Moraine, Ohio. The line largely replaced the earlier 6.2 and 6.5 L Detroit Diesel V8 engines. In 2006, production at Moraine was reportedly limited to approximately 200,000 engines per year.[1] On May 9, 2007, DMAX announced the production of the 1,000,000th Duramax V-8 Diesel Engine at its Moraine facility.[1]

Contents

[edit] LG5

The LG5, or 6H, is an inline-six cylinder 7.8 L (476 cu in) 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 Allsion 3000 and 3500 Series transmissions.

The following trucks use the LG5:

[edit] Specifications

  • Engine description: 7.8L I6 Turbodiesel; 6H
  • Displacement: 7.8L / 475.9 in³
  • 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
  • Injection: Direct; Denso Common-rail
  • Power / Torque: 200 hp (150 kW) @ 2,200 rpm / 520 lb·ft (705 N·m) @ 1,450 rpm (Standard)
  • Power / Torque: 275 hp (205 kW) @ 2,200 rpm / 860 lb·ft (1,166 N·m) @ 1,450 rpm (High-Torque Version)

[edit] LB7

The LB7 was the first to be introduced in 2001. The V8 engine is a 6.6 L (402.8 cu in) and it has 300 hp (224 kW) and 520 lb·ft (705 N·m) of torque. It is a 32-valve design with high-pressure common-rail direct injection and aluminum cylinder heads.

The Duramax was on the Ward's 10 Best Engines list in 2001 and 2002.

The following trucks use the LB7:

[edit] Specifications

  • Engine Description: LB7
  • Displacement: 6.6L / 403 in³
  • 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: 300 hp (220 kW) @ 3,100 rpm / 520 lb·ft (705 N·m) @ 1,800 rpm

[edit] LLY

The LLY (internally called the 8GF1) is a 6.6 L (6599 cc) turbocharged engine which debuted in 2004 in GM trucks. It is a 32-valve design with high-pressure common-rail direct injection and aluminum cylinder heads. Output is 310 hp (231 kW) at 3100 rpm and 605 lb·ft (820 N·m) at just 1800 rpm. The engine was released with a new Garrett turbocharger with a variable geometry vane system. The valve covers were scalloped 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.

The following trucks used the LLY engine:

[edit] Specifications

  • Engine Code: LLY
  • Displacement: 6.6L / 403 in³
  • 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: 310 hp (231 kW) @ 3,000 rpm / 605 lb·ft (820 N·m) @ 1,800 rpm

[edit] LBZ

The LBZ is nearly identical to the LLY engine. It is a 6.6 L turbocharged engine and was introduced in 2005 for the 2006 and early 2007 model years. Its output is 360 hp (268 kW) at 3200 rpm and torque is 650 lb·ft (881 N·m) at 1600 rpm. It's mated to a new Allison 1000 6-speed transmission.

The following trucks have or are due to have the LBZ engine:

[edit] Specifications

  • Engine Code: LBZ
  • Displacement: 6.6L / 403 in³
  • 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: 360 hp (268 kW) @ 3,200 rpm / 650 lb·ft (881 N·m) @ 1,600 rpm

[edit] LMM

The LMM specifications are nearly identical to the LBZ engine. It is a 6.6 L turbocharged engine and was introduced in 2006 for the 2007.5 model year. Its output has seen a slight increase of 5 hp (4 kW) and 10 lb·ft (14 N·m) of torque over the LBZ. This makes it 365 hp (272 kW) at 3200 rpm and 660 ft (201 m)·ft·lbf of torque at 1600 rpm. It's mated to an Allison 1000 6-speed transmission.

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.

[edit] Specifications

  • Engine Description: LMM
  • Displacement: 6.6L / 403 in³
  • 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: 365 hp (272 kW) @ 3,200 rpm / 660 lb·ft (895 N·m) @ 1,600 rpm

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:

[edit] 4.5L

 This section contains information about a scheduled or anticipated future automobile.
It may contain preliminary or speculative information, and may not reflect the final version of the vehicle.

General Motors plans a 4.5 L 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 310 hp (231 kW) and 520 lb·ft (705 N·m) 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.[2] Unlike previous Duramax engines, the 4.5 liter will be designed and built entirely by GM, without assistance from Isuzu.[3]

[edit] See also

[edit] Related links

[edit] References

  1. ^ a b GM celebrates one-millionth Duramax diesel. Retrieved on May 9, 2007.
  2. ^ Neff, John (2007-06-15). GM announces new 4.5L V8 Duramax diesel for half-ton trucks and HUMMER H2. Autoblog. Retrieved on 2007-06-21.
  3. ^ Levine, Mike (2007-06-15). GM Announces Production of New 4.5-Liter Duramax Diesel V8 for Light Duty Pickups. PickupTruck.com. Retrieved on 2007-06-21.
4.Kouji Hirukawa was an original group leader of Isuzu Design Team.