2011-2016 LML Duramax
The LML brought higher injection pressure, improved horsepower and torque, and SCR emissions technology to the Duramax line.
Engine Name: 6.6L Duramax (RPO Code “LML”)
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: 16.8:1
Block: Deep-skirt, cast-iron (gray iron), parent bore with induction-hardened cylinder bores, 11-percent higher volume oil pump
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 CP4.2 high-pressure fuel pump with 2 internal plungers, gear-driven and timed to the crankshaft and camshaft, 30,000 psi peak pressure
Injectors: Bosch electronic, piezoelectric type
Firing Order: 1-2-7-8-4-5-6-3
Aspiration: Turbocharged and intercooled
Intake: Cast-aluminum Y-bridge, intake airflow valve (i.e. throttle valve)
Turbo: Garrett GT3788VA VVT variable geometry, non-wastegated, journal bearing unit with 60.6mm compressor wheel (inducer), 70mm turbine wheel (exducer), and turbo brake
Intercooler: Air to air
Emissions Equipment: Dual circuit exhaust gas recirculation (EGR), diesel oxidation catalyst (DOC), diesel particulate filter (DPF) with ninth injector for regeneration, selective catalytic reduction (SCR)
Overall Weight: 835 lbs (dry)
Horsepower: 397 hp at 3,000 rpm
Torque: 765 lb-ft at 1,600 rpm
Available Transmissions: Allison 1000 six-speed automatic
