The LB7 Duramax was first introduced in 2001 and produced until 2004. The 32 valve, V8 design utilizes a high pressure common rail direct injection system. Due to the lack of emission equipment, the LB7 is considered one of the most sought after Duramax's built, obtaining the best fuel mileage and having the simplest design.
-6.6L Duramax LB7 Specs:
Configuration:
-90 degree V8
Displacement:
-402 cubic inches, 6.6 liters
Block/Head material:
- Cast iron block
- Aluminum cylinder heads
Compression Ratio:
-17.5:1
Bore:
-4.06 inches
Stroke:
-3.90 inches
Aspiration:
- Turbocharger
- air to air intercooler
- Maximum boost: 20 psi
Valvetrain:
-OHV, 4 valves per cylinder
Injection:
- Direct injection
- Bosch high pressure common rail, CP3 injection pump
- 23,000 psi max injection pressure
Oil Capacity:
-10 quarts w/filter
Weight:
-approx. 835 lbs
Horsepower:
-235 hp @ 2,700 RPM (2001)
-300 hp @ 3,100 RPM (2004)
Torque:
-500 lb-ft @ 1,600 RPM (2001)
-520 lb-ft @ 1,800 RPM(2004)
Maximum Engine Speed:
-3,250 RPM
*output varies slightly with model year.
6.6L LB7 Information:
• LB7 applications include the Chevrolet Silverado HD, GMC Sierra HD, Chevrolet Kodiak, GMC Topkick.
• Poorly design LB7 injectors often failed, requiring frequent replacement. Injectors from the LB7 Duramax were eventually recalled & replaced. The factory warranty was also extended to cover injectors for up to 200,000 miles.
• The LB7 Duramax was featured in Ward's 10 Best Engines for 2001 & 2002.
• Possibly the most fuel efficient Duramax due to its lack of emissions equipment, which notoriously dampens fuel economy.
• 4 bolt mains, 2 vertical, 2 horizontal.
• At 34.88 inches long, the Duramax is over an inch shorter than the 6.5L GM diesel.
• Aluminum pistons with piston cooling jets for lower combustion & piston temperatures.
• Forged & fractured connecting rods.
Info took from [Only admins are allowed to see this link]
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