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General Motors Atlas engine

Atlas
GM Atlas I6 front.jpg
Overview
Manufacturer General Motors Corporation
Also called Vortec
Production 2002–2012
Combustion chamber
Configuration
Displacement 169-254 cu in (2770-4160 cc)
Cylinder block alloy Aluminum
Cylinder head alloy Aluminum
Valvetrain DOHC
Compression ratio 10.0:1
Combustion
Fuel system Multi-point fuel injection
Fuel type Gasoline
Oil system Wet sump
Cooling system Water-cooled
Chronology
Predecessor
LL8
2006 LL8 (Vortec 4200) engine in 2006 Chevrolet Trailblazer.jpg
Overview
Also called Vortec 4200
Production 2002-2009
Combustion chamber
Configuration straight-6
Displacement 4,160 cc (254 cu in)
Cylinder bore 93 mm (3.7 in)
Piston stroke 102 mm (4.0 in)
Output
Power output 270–291 hp (201–217 kW)
Torque output 275–277 lb·ft (373–376 N·m)
L52
GMC Canyon Vortec 3500 engine.jpg
Overview
Also called Vortec 3500
Production 2004-2006
Combustion chamber
Configuration straight-5
Displacement 3,460 cc (211 cu in)
Cylinder bore 93 mm (3.7 in)
Piston stroke 102 mm (4.0 in)
Output
Power output 220 hp (164 kW)
Torque output 225 lb·ft (305 N·m)
LLR
Overview
Also called Vortec 3700
Production 2007-2012
Combustion chamber
Configuration straight-5
Displacement 3,653 cc (222.9 cu in)
Cylinder bore 95.5 mm (3.76 in)
Piston stroke 102 mm (4.0 in)
Output
Power output 242 hp (180 kW)
Torque output 242 lb·ft (328 N·m)
LK5
Overview
Also called Vortec 2800
Production 2004-2008
Combustion chamber
Configuration straight-4
Displacement 2,770 cc (169 cu in)
Cylinder bore 93 mm (3.7 in)
Piston stroke 102 mm (4.0 in)
Output
Power output 175 hp (130 kW)
Torque output 185 lb·ft (251 N·m)
LLV
Overview
Also called Vortec 2900
Production 2007-2012
Combustion chamber
Configuration straight-4
Displacement 2,921 cc (178.3 cu in)
Cylinder bore 95.5 mm (3.76 in)
Piston stroke 102 mm (4.0 in)
Output
Power output 185 hp (138 kW)
Torque output 190 lb·ft (258 N·m)

Atlas is a name for a family of modern inline piston engines for trucks from General Motors, used in the GMT 355 and GMT360 platforms. The series debuted in 2002 with the Oldsmobile Bravada, and is also used in the Buick Rainier, the Chevrolet TrailBlazer and Colorado, the GMC Envoy and Canyon, the Hummer H3, Isuzu Ascender and i-370, and the Saab 9-7X. The engines use GM's Vortec name, and I4, I5, and I6 engines are all part of the same family, sharing the same manufacturing equipment, rods, pistons, valves, and other parts. They feature variable valve timing on the exhaust side, electronic throttle control, and a special oil pan with a pass-through for the half shafts in four-wheel drive vehicles. The inclusion of VVT on the exhaust camshaft side allows the Atlas series to meet emissions standards without the use of EGR, simplifying the engine design and increasing power for a broad power curve. The LL8 shares 75% of its components with the LK5 and L52; while the LK5 and L52 share 89% of their components.


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