GM Atlas engine

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Atlas is a name for a family of modern inline piston engines for trucks from General Motors. The series debuted in 2002 with the Chevrolet TrailBlazer, and is also used in the Chevrolet Colorado and their GMC twins, the Envoy and Canyon. In production, 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 Atlas program began in 1995 along with the planning for GM's next-generation mid-size SUVs and pickup trucks. These vehicles were designed around the I6 engine. The I6 version was used in a Baja 2000 racing truck, winning its first race in a class that also included V8 engines. Another I6-powered truck won the truck class at the Pikes Peak International Hillclimb.

The I6 Atlas engines are produced at the Flint Engine South plant in Flint, Michigan, while the I4 and I5 versions are produced at the Tonawanda Engine plant in Tonawanda, New York.

Contents

[edit] LL8

The LL8 (or Vortec 4200), is a straight-6 truck engine. It was the first Atlas engine, and was designed for GM's new SUV line. When introduced, this engine's power was 275 hp (205 kW) and torque was 275 ft·lbf (373 N·m). For 2006, power was increased to 291 hp (217 kW) and torque to 277 ft·lbf (376 N·m). The Atlas LL8 was on the Ward's 10 Best Engines list for 2002 through 2005.

LL8 Applications:

[edit] L52

Vortec 3500 L52 engine in a 2005 GMC Canyon
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Vortec 3500 L52 engine in a 2005 GMC Canyon

The L52 (also called Vortec 3500), is a straight-5 truck engine. It displaces 3.5 L (3460 cc) and shares much with the rest of the Atlas family. It produces 220 hp (164 kW) and 225 ft·lbf (305 N·m).

It is used in the following vehicles:

[edit] LLR

The L5R (also called Vortec 3700), is a straight-5 truck engine. It displaces 3.7 L and shares much with the rest of the Atlas family. It produces 242 hp (180 kW) and 242 ft·lbf (327 N·m).

It is used in the following vehicles:

[edit] LK5

The straight-4 LK5 engine is sold as the Vortec 2800 in GM trucks. Like its Atlas brothers, the LK5 has dual overhead cams, and shares their 93 mm bore and 102 mm stroke. The LK5 displaces 2.8 L (2770 cc) and produces 175 hp (131 kW) and 185 ft·lbf (251 N·m).

It is used in the following vehicles:

[edit] LLV

The straight-4 LLV engine is sold as the Vortec 2900 in GM trucks. The LLV displaces 2.9 L and produces 185 hp (138 kW) and 195 ft·lbf (263 N·m).

It is used in the following vehicles:

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