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| {{Infobox Automobile engine
| | [[Truck]] engines built by the [[GMC (General Motors division)|GMC]] division of [[General Motors Corporation]]. |
| | image =
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| | name = Atlas
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| | aka =
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| | manufacturer = [[General Motors Corporation]]
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| | type = [[straight-4]]<br>[[straight-5]]<br>[[straight-6]]
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| | production = 2002 - present
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| | predecessor = [[Chevrolet Straight-6 engine]]
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| | successor =
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| | displacement = 169-254 cu in (2770-4160 cc)
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| | supercharger =
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| | fuelsystem =
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| '''Atlas''' is a name for a family of modern [[straight engine|inline]] [[piston engine]]s for [[truck]]s from [[General Motors Corporation|General Motors]]. The series debuted in 2002 with the [[Oldsmobile Bravada]], and is also used in the [[Chevrolet TrailBlazer]] and [[Chevrolet Colorado|Colorado]] and their [[GMC (General Motors division)|GMC]] twins, the [[GMC Envoy|Envoy]] and [[GMC Canyon|Canyon]]. In production, the engines use GM's [[GM Vortec engine|Vortec]] name, and [[Straight-4|I4]], [[Straight-5|I5]], and [[Straight-6|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 manifold|exhaust]] side, [[electronic throttle control]], and a special oil pan with a pass-through for the [[half shaft]]s in [[four-wheel drive]] vehicles. The inclusion of VVT on the exhaust allows the Atlas series to meet emissions standards without the use of [[EGR]], simplifying the engine design.
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| The Atlas program began in 1995 along with the planning for GM's next-generation mid-size [[Sport utility vehicle|SUV]]s and [[pickup truck]]s. These vehicles were designed around the I6 engine. The I6 version was used in a [[Baja 1000|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]].
| | [[Category:GM engines]] |
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| 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]].
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| ==LL8==
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| [[Image:LL8.jpg|right|thumb|250px|Vortec 4200 LL8 engine in a 2006 Chevrolet Traiblazer.]]
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| 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. It displaces 4.2 L {{nowrap|(4160 cc, 254 cu in)}}<ref>http://media.gm.com/us/powertrain/en/product_services/2007/Spec%20Sheet/Line%20456/2007_LL8.xls</ref>, with a {{Auto mm|93|1}} bore and {{Auto mm|102|1}} stroke. When introduced, this engine's power was 270 hp (205 kW) @ 6000 rpm and torque was 275 ft·lbf (373 N·m) @ 3600 RPM. 2003 saw a slight bump in power to {{convert|275|hp|abbr=on}}, while torque was unchanged. For 2006, power was increased to 291 hp (217 kW) @ 6000 rpm and torque to 277 ft·lbf (376 N·m) @ 4800 rpm with the addition of a [[Mass_flow_sensor#Hot_wire_sensor_.28MAF.29|MAF]] and a complete internal redesign of the engine. The Atlas LL8 was on the [[Ward's 10 Best Engines]] list for 2002 through 2005. Engine redline is 6300 rpm.
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| LL8 Applications:
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| * 2002-2007 [[GMC Envoy]], ''Envoy XL'', and ''Envoy XUV''
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| * 2002-2007 [[Chevrolet TrailBlazer]] and ''TrailBlazer EXT''
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| * 2002-2004 [[Oldsmobile Bravada]]
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| * [[Buick Rainier]]
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| * [[Isuzu Ascender]]
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| * [[Saab 9-7X]]
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| ==L52==
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| {{Infobox Automobile engine generation
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| | image = [[Image:GMC_Canyon_Vortec_3500_engine.jpg|250px|Vortec 3500 L52 engine in a 2005 [[GMC Canyon]]]]
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| | name = L52
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| | aka = Vortec 3500
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| | type = [[straight-5]]
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| | production =
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| | predecessor =
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| | successor =
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| | bore = {{Auto mm|93}}
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| | stroke = {{Auto mm|102}}
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| | displacement = {{convert|3460|cc|CID|abbr=on|lk=on}}
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| | block =
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| | head =
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| | valvetrain =
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| | supercharger =
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| | turbocharger =
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| | fuelsystem =
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| | fueltype =
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| | oilsystem =
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| | coolingsystem =
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| | power = {{Convert|220|hp|kW|0|abbr=on}} @ 5600 [[Revolutions per minute|RPM]]
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| | specpower =
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| | torque = {{Auto ftlbf|225}} @ 2800 [[Revolutions per minute|RPM]]
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| | compression =
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| | fuelcon =
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| | specfuelcon =
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| | similar =
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| }}
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| The '''L52''' (also called '''Vortec 3500'''), is a [[straight-5]] [[truck]] engine. It displaces 3.5 L ({{convert|3460|cc|CID|abbr=on|disp=s}}), with a {{Auto mm|93|1}} bore and {{Auto mm|102|1}} stroke, and shares much with the rest of the Atlas family. Dynoed at the flywheel it produces 220 hp (164 kW) @ 5600 rpm and 225 ft·lbf (305 N·m) @ 2800 rpm, while producing 179.13 hp at 6001 rpm when dynoed at the rear wheels. Engine redline is 6300 rpm.
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| It is used in the following vehicles:
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| * 2002 [[Chevrolet Bel Air]] concept
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| * 2004-2006 [[Chevrolet Colorado]]
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| * 2004-2006 [[GMC Canyon]]
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| * 2006 [[Isuzu i-Series]]
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| * 2006 [[Hummer H3]]
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| ==LLR==
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| The '''LLR''' (also called '''Vortec 3700'''), is a [[straight-5]] [[truck]] engine. It displaces 3.7 L ({{convert|3653|cc|CID|0|abbr=on|disp=s}}), courtesy of a larger {{convert|95.5|mm|in|abbr=on}} bore while keeping the {{Auto mm|102|1}} stroke, and shares much with the rest of the Atlas family. It produces 242 hp (180 kW) @ 5600 rpm and 242 ft·lbf (327 N·m) @ 4600 rpm. Engine redline is 6300 rpm.
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| It is used in the following vehicles:
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| * 2007 [[Chevrolet Colorado]]
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| * 2007 [[GMC Canyon]]
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| * 2007 [[Isuzu i-Series]]
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| * 2007 [[Hummer H3]]
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| ==LK5==
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| The [[straight-4]] '''LK5''' engine is sold as the '''Vortec 2800''' in GM trucks. Like its Atlas brothers, the LK5 has [[dual overhead cam]]s, and shares their {{Auto mm|93|1}} bore and {{Auto mm|102|1}} stroke. The LK5 displaces 2.8 L {{nowrap|(2770 cc, 169 cu in)}} and produces 175 hp (131 kW) @ 5600 rpm and 185 ft·lbf (251 N·m) @ 2800 rpm.<ref>http://media.gm.com/us/powertrain/en/product_services/2006/Spec%20Sheets/Line%20456/2006%20Line%20I4%20Truck%20(LK5).pdf</ref> Engine redline is 6300 rpm.
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| It is used in the following vehicles:
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| * 2004-2006 [[Chevrolet Colorado]]
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| * 2004-2006 [[GMC Canyon]]
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| * 2006 [[Isuzu i-Series]]
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| ==LLV==
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| The [[straight-4]] '''LLV''' engine is sold as the '''Vortec 2900''' in GM trucks. It shares the same 95.5 mm bore and {{Auto mm|102|1}} stroke as the '''LLR Vortec 3700'''. The LLV displaces 2.9 L {{nowrap|(2921 cc, 178 cu in)}}<ref>http://media.gm.com/us/powertrain/en/product_services/2007/Spec%20Sheet/Line%20456/2007_LLV.xls</ref> and produces 185 hp (138 kW) @ 5600 rpm and 195 ft·lbf (263 N·m) @ 2800 rpm. Engine redline is 6300 rpm.
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| It is used in the following vehicles:
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| * 2007 [[Chevrolet Colorado]]
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| * 2007 [[GMC Canyon]]
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| * 2007 [[Isuzu i-Series]]
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| [[Category:GM engines|Atlas]] | |