6.6L L5P Duramax Turbo-diesel Engine from GM Powertrain

3.0L I-6 LZ0 DURAMAX® TURBO DIESEL

TORQUE WHERE IT COUNTS
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HORSEPOWER: 305 HP (227 kW) @ 3750 RPM*
Torque Icon

TORQUE: 495 LB-FT (671 NM) @ 2750 RPM*
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FUEL TYPE: ULTRA-LOW SULFUR DIESEL AND B20 BIODIESEL
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3.0L I-6 LZ0 Features & Specifications

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The LZ0 Duramax 3.0L turbo diesel is the second generation inline-six turbo diesel over the previous LM2. The refinements made to the LZ0 help deliver an impressive 305 horsepower and 495 lb.-ft. of torque. Diesel engines are all about torque, the LZ0 delivers it at low rpm, where it counts when taking off under load. The engine’s peak torque of 495 lb.-ft. (671 Nm) is achieved at only 2,750 rpm, with 94 percent of that max twisting force available by 1,500 rpm.

LZ0 Refinements:

  • Piston design and material changed to steel to help handle higher compression ratio and help optimize air/fuel mixture
  • New fuel injectors designed to control higher fuel pressure with optimized spray pattern
  • Revised turbocharger assists with increasing torque
  • Oil pump belt validated to 200k miles service interval, an increase of 33% from 150k
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Type:

3.0L I-6 LZ0 Turbo-Diesel

Displacement:

2999 CC (183 CI)

Engine Orientation:

Longitudinal

Compression Ratio:

15.2:1

Valve Configuration:

Dual Overhead Camshafts

Valves per Cylinder:

Four

Assembly Site:

Flint, MI of Globally Sourced Parts

Valve Lifters:

Mechanical Roller

Firing Order:

1–5–3–6–2–4

Bore x Stroke:

84 x 90 mm

Fuel System:

Direct Injection

Fuel Type:

Ultra-Low Sulfur Diesel and B20 Biodiesel

Horsepower:

305 HP (277 kW) @ 3750 rpm*

Torque:

495 lb-ft (671 Nm) @ 2750 rpm*

Maximum Engine Speed:

5000 rpm

Emissions Controls:

High Pressure EGR (uncooled)
Low Pressure EGR (cooled)
Close Coupled Diesel Oxide
Catalyst (CCDOC)
Selective Catalytic Reduction on Particulate Filter (SCRF)
Selective Catalytic Reduction (SCR)
Ammonia Slip Catalyst (ASC)

Block:

Cast Aluminum

Cylinder Head:

Cast Aluminum

Intake Manifold:

Composite

Exhaust Manifold:

Nodular Iron

Main Bearing Caps:

Nodular Iron

Crankshaft:

Forged Steel

Camshaft:

Assembled Steel

Connecting Rods:

Forged Steel

Connecting Rods:

Forged Steel

*As tested in Chevrolet Silverado