General Motors Atlas engine
| Atlas | |
|---|---|
 |
|
| 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 | |
|---|---|
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|
| 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 | |
|---|---|
 |
|
| 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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