2004.5-2006 LLY Duramax
The LLY Duramax moved the injectors above the valve covers and replaced the IHI turbo with a Garrett VGT.
Engine Name: 6.6L Duramax (RPO Code “LLY”)
Production Plant: DMax Ltd., Moraine, Ohio
Configuration: 90-degree V-8
Bore: 4.06-inch
Stroke: 3.90-inch
Displacement: 403 ci (6.6L)
Compression Ratio: 17.5:1
Block: Deep-skirt, cast-iron (gray iron), parent bore with induction-hardened cylinder bores
Heads: Cast-aluminum with six head bolts per cylinder (with sharing), 4 valves per cylinder, forged-steel rocker arms (each rocker arm utilizes a guideless bridge to operate two valves)
Crankshaft: Forged 4340, Tufftride-treated for improved fatigue strength, and heat-treated for a cast-hardened surface
Connecting Rods: Forged-steel, cracked cap
Pistons: Cast-aluminum with ion plated upper compression ring (for maximum durability)
Valvetrain: Overhead valve (OHV), 4 valves per cylinder, single cam-in-block design
Injection System: Electronic high-pressure common rail, direct injection
Injection Pump: Bosch CP3 radial piston high-pressure fuel pump with 3 internal plungers, gear-driven but not timed to the crankshaft or camshaft, 23,200 psi peak pressure
Injectors: Bosch electronic, solenoid type (outside valve covers)
Firing Order: 1-2-7-8-4-5-6-3
Aspiration: Turbocharged and intercooled
Intake: Cast-aluminum Y-bridge
Turbo: Garrett GT3788VA variable geometry, non-wastegated, journal bearing unit with 62mm compressor wheel (inducer) and 65mm (exducer) turbine wheel
Intercooler: Air to air
Emissions Equipment: Exhaust gas recirculation (EGR)
Overall Weight: 835 lbs (dry)
Horsepower: 310 hp at 3,000 rpm
Torque: 520 lb-ft at 1,600 rpm (’04.5-’05.5), 605 lb-ft at 1,600 rpm (early ‘06)
Available Transmissions: Allison 1000 five-speed automatic, ZF-6 six-speed manual
