6.6 L Duramax LLY

6.6L Duramax LLYThe Duramax LLY was introduced in 2004 to replace the popular LB7. Like the LB7, the LLY utilizes a high pressure common rail direct injection system. The LLY was General Motors' first attemp at implementing emission controls on a diesel engine to meet stricter emissions requirements in the furture. The LLY adopted a variable geometry turbocharger (VGT) and exhaust gas recirculation (EGR) system to help reduce emissions. Huge changes to the LLY debuted in 2006, but the engines were mechanically identical. LLY's were used in the Hummer H1, Chevrolet Silverado HD, and GMC Sierra HD.

6.6L Duramax LLY Specs:

Configuration:

90 degree V8

Displacement:

403 cubic inches, 6.6 liters

Block/head material:

- Cast iron block
- Aluminum cylinder heads

Compression Ratio:

17.5:1 (16.8:1 in 2006)

Bore:

4.06 inches

Stroke:

3.90 inches

Aspiration:

- Garrett variable geometry turbocharger (VGT)
- air to air intercooler.

Valvetrain:

OHV, 4 valves per cylinder

Injection:

- Direct injection
- High pressure Bosch common rail, CP3 injection pump
- 23,000 psi max injection pressure

Oil Capacity:

10 quarts w/filter

Weight:

approx. 835 lbs

*Horsepower:

- 310 hp @ 3,000 RPM
- 310 hp @ 3,000 RPM (2006)

*Torque:

520 lb-ft @ 1,600 RPM
605 lb-ft @ 1,600 RPM (2006)

Maximum Engine Speed:

3,250 RPM

Emissions Controls:

- Exhaust gas recirculation (EGR)
- Variable geometry turbocharger (VGT)
- Catalytic converter

*output varies slightly with model year.

 

6.6L LLY Info:

• LLY applications include the Chevrolet Silverado HD, Hummer H1, GMC Sierra HD, Chevrolet Kodiak, GMC Topkick.
• First Duramax to feature emissions controls.
• 4 bolt mains, forged & fractured connecting rods.
• Aluminum pistons with piston cooling oil jets.

 

Related Topics:

6.6L Duramax LB7 Specs 6.6L Duramax LBZ Specs
6.6L Duramax LMM Specs 6.6L Duramax LML Specs
Compare Duramax Generations 2006 Duramax LLY Changes

 

6.6L Duramax LLY Specs