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{{Infobox automobile engine
| image = GM Atlas I6 front.jpg
| name = General Motors Atlas
| aka = Vortec
| manufacturer = [[General Motors Corporation]]
| configuration = [[Straight-4]], [[Straight-5]], and [[Straight-6]]
| production = 2002–2012
| predecessor = {{ubl | [[Chevrolet Turbo-Thrift engine]]|[[General Motors 122 engine]]}}
| redline = 6,300 rpm
| displacement = {{ubl | {{cvt|2770|cc|L cc cuin|1|order=out}}|{{cvt|2921|cc|L cc cuin|1|order=out}}|{{cvt|3460|cc|L cc cuin|1|order=out}}|{{cvt|3653|cc|L cc cuin|1|order=out}}|{{cvt|4160|cc|L cc cuin|1|order=out}}|}}
| compression = 10.0:1
| block = [[Aluminum]]
| head = Aluminum
| valvetrain = [[DOHC]] [[Multi-valve#Four valves|4 valves x cyl.]] with [[Variable valve timing|VVT]]
| fuelsystem = [[Multi-point fuel injection]]
| fueltype = [[Gasoline]]
| oilsystem = [[Wet sump]]
| coolingsystem = [[Radiator (engine cooling)|Water-cooled]]
| bore = {{ubl | {{cvt|93|mm|in|2}}| {{cvt|95.5|mm|in|2}}}}
| stroke = {{cvt|102|mm|in|2}}
| power = {{cvt|175-291|hp|kW|0}}
| torque = {{cvt|185-277|lbft|Nm|0}}
}}
'''Atlas''' is a name for a family of [[straight engine|inline]] [[piston engine]]s for [[truck]]s from [[General Motors]], used in the [[GMT355]] and [[GMT360]] platforms. The series debuted in 2002 with the [[Oldsmobile Bravada]], and is used in the [[Buick Rainier]], the [[Chevrolet TrailBlazer]] and [[Chevrolet Colorado|Colorado]], the [[GMC Envoy]] and [[GMC Canyon|Canyon]], the [[Hummer H3]], [[Isuzu Ascender]] and [[Isuzu i-370|i-370]], and the [[Saab 9-7X]]. The engines use GM's Vortec name, with [[straight-4]], [[straight-5]], and [[straight-6]] engines all part of the same family, sharing the same manufacturing equipment, rods, pistons, valves, and other parts. They feature [[coil-on-plug ignition]] systems,<ref name="counterman">{{cite web|url=https://www.counterman.com/tech-feature-straight-look-vortec-3500-straight-five-engine/|title=5 Cylinder Engine - Vortec 3500|accessdate=2011-10-13}}</ref> [[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 camshaft side allows the Atlas series to meet emissions standards without the use of [[Exhaust gas recirculation|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.<ref name="2005_GM">{{cite web|title=Improved Performance and Efficiency Highlight a Robust Powertrain Lineup for ’05|archive-url=https://web.archive.org/web/20100108030402/http://archives.media.gm.com/division/2005_prodinfo/powertrain/index.html|archive-date=2010-01-08|url=http://archives.media.gm.com/division/2005_prodinfo/powertrain/index.html}}</ref>
The Atlas engines feature aluminum cylinder blocks and heads, with the cylinder bores featuring replaceable steel [[cylinder liner]]s.<ref name="counterman"/> The 4- and 5-cylinder versions feature dual balance shafts,<ref name="2006_LK5" /><ref name="2006_L52" /> which are unnecessary in the 6-cylinder.<ref>{{Citation |title=6 Cylinder Engine - Straight Six - Explained |url=https://www.youtube.com/watch?v=w5NZsc1oQpU |access-date=2023-06-17 |language=en}}</ref>
The Atlas program began in 1995 along with the planning for GM's next-generation mid-size [[Sport utility vehicle|SUVs]] and [[pickup truck]]s. These vehicles were designed around the I6 engine. The I6 version was used in a [[Baja 1000]] racing truck, winning its first race in a class that also included [[V8 engine]]s. Another I6-powered truck won the truck class at the [[Pikes Peak International Hillclimb]].
The Atlas engines were produced at the [[Flint Engine South]] plant in [[Flint, Michigan]], while the I4 and I5 versions were produced at the [[Tonawanda Engine|Tonawanda Engine plant]] in [[Tonawanda (town), New York|Tonawanda, New York]], near [[Buffalo, New York|Buffalo]].
== LL8 (Vortec 4200) ==
[[File:2006 LL8 (Vortec 4200) engine in 2006 Chevrolet Trailblazer.jpg|thumb|left|2006 LL8 (Vortec 4200) engine in 2006 Chevrolet TrailBlazer]]
The '''LL8''' (or '''Vortec 4200'''), is a [[straight-6]] gasoline engine produced from 2002 to 2009. It was the first Atlas engine, and was introduced in 2002 for the [[Chevrolet TrailBlazer]], [[GMC Envoy]], and [[Oldsmobile Bravada]]. The engine was also used in the [[Buick Rainier]], [[Saab 9-7X]], and [[Isuzu Ascender]].
It displaces {{cvt|4.16|L|cc cuin|adj=ri1|sigfig=4}}, with a {{cvt|93x102|mm|in|2}} bore and stroke. It has four valves per cylinder, dual-overhead cams ([[DOHC]]), and [[variable valve timing]] on the exhaust cam, a first for GM inline engines. When introduced, this engine's power was {{cvt|270|hp|kW|0}} at 6,000 [[revolutions per minute|rpm]] and torque was {{cvt|275|lbft|Nm|0}} at 3,600 rpm. 2003 saw a slight bump in power to {{cvt|275|hp|0}}, while torque was unchanged. For 2006, power was increased to {{cvt|291|hp|kW|0}} at 6,000 rpm and torque to {{cvt|277|lbft|Nm|0}}) at 4800 rpm with the addition of a [[Mass flow sensor#Hot wire sensor (MAF)|MAF]] and a complete internal redesign of the engine; however, due to the new [[SAE viscosity number|SAE]] rating procedures, ratings can vary slightly between years. The engine redline is 6,300 rpm. The '''LL8''' was on the [[Ward's 10 Best Engines]] list for 2002 through 2005 and was the basis for all the other '''Atlas''' engines. With the closure of the [[Moraine, Ohio]], plant and the discontinuation of the [[GMT360]] platform (Chevrolet TrailBlazer, GMC Envoy, etc.), production of the '''LL8''' also ended.<ref name="2007_LL8">{{XLSlink|[https://web.archive.org/web/20111027073341/http://archives.media.gm.com/us/powertrain/en/product_services/2007/Spec%20Sheet/Line%20456/2007_LL8.xls 2007 LLR Spec Sheet]}}</ref>
Applications:
* 2002–2009 [[GMC Envoy]], ''Envoy XL'', and ''Envoy XUV''
* 2002–2009 [[Chevrolet TrailBlazer]] and ''TrailBlazer EXT''
*
* 2004–2007 [[Buick Rainier]]
* 2003–2008 [[Isuzu Ascender]]
* 2005–2009 [[Saab 9-7X]] 4.2i
== LLR (Vortec 3700)==
The '''LLR''' (also called '''Vortec 3700'''), is a [[straight-5]] [[DOHC]] engine produced from 2007 through 2012. It displaces {{cvt|3653|cc|L cc cuin|1|order=out}}, courtesy of a larger {{cvt|95.5|mm|in}} bore while keeping the {{cvt|102|mm|in|2}} stroke. The '''LLR''' also corrected the head issue found in the ''L52''. It produces {{cvt|242|hp|kW|0}} at 5,600 [[revolutions per minute|rpm]] and {{cvt|242|lbft|Nm|0}} at 4,600 rpm. The engine redline is 6,300 rpm.<ref name="2007_LL8"/>
Applications:
* 2007–2012 [[Chevrolet Colorado]] and [[GMC Canyon]]
* 2007–2010 [[Hummer H3]]
* 2007–2008 [[Isuzu i-370]]
== L52 (Vortec 3500) ==
[[File:GMC Canyon Vortec 3500 engine.jpg|thumb|GMC Canyon Vortec 3500 engine]]
The '''L52''' (also called '''Vortec 3500'''), is a [[straight-5]] [[DOHC]] engine produced from 2004 through 2006. It displaces {{cvt|3460|cc|L cc cuin|1|order=out}}, with a {{cvt|93x102|mm|in|2}} bore and stroke. [[Dynamometer|Dynoed]] at the [[flywheel]] it produces {{cvt|220|hp|kW|0}} at 5,600 [[revolutions per minute|rpm]] and {{cvt|225|lbft|Nm|0}} at 2,800 rpm. The engine redline is 6,300 rpm.<ref name="2006_L52">{{cite web|archive-url=https://web.archive.org/web/20160109064824/http://archives.media.gm.com/us/powertrain/en/product_services/2006/Spec%20Sheets/Line%20456/2006%20Line%20I5%20Truck%20(L52).pdf|archive-date=2016-01-09|url=http://archives.media.gm.com/us/powertrain/en/product_services/2006/Spec%20Sheets/Line%20456/2006%20Line%20I5%20Truck%20(L52).pdf|title=2006 Vortec 3500 3.5L I-5 (L52) Spec Sheet}}</ref>
Applications:
* 2002 [[Chevrolet Bel Air#2002 concept|Bel Air]] concept
* 2004–2006 [[Chevrolet Colorado]] and GMC Canyon
* 2006 [[Chevrolet Colorado#Isuzu i-series|Isuzu i-350]]
* 2006 [[Hummer H3]]
== LLV (Vortec 2900) ==
The '''LLV''' (also called '''Vortec 2900''') is a {{cvt|2921|cc|L cuin|1|order=flip}} [[straight-4]] [[DOHC]] engine produced between 2007 and 2012, with a {{cvt|95.5x102|mm|in|2}} bore and a stroke. It replaced the '''LK5''' and produced {{cvt|185|hp|kW|0}} at 5,600 [[revolutions per minute|rpm]] and {{cvt|190|lbft|Nm|0}} of torque at 2,800 rpm. The engine redline is 6,300 rpm.<ref name="2007_LLV">{{XLSlink|[https://web.archive.org/web/20160109064824/https://archives.media.gm.com/us/powertrain/en/product_services/2007/Spec%20Sheet/Line%20456/2007_LLV.xls 2007 LLV Spec Sheet]}}</ref>
Applications:
* 2007–2012 [[Chevrolet Colorado]] and [[GMC Canyon]]
* 2007–2008 [[Isuzu i-290]]
== LK5 (Vortec 2800) ==
The '''LK5''' (also called the '''Vortec 2800''') is a {{cvt|2770|cc|L cuin|1|order=flip}} [[straight-4]] [[DOHC]] engine produced between 2004 and 2006, with a {{cvt|93x102|mm|in|2}} bore and stroke. It produces {{cvt|175|hp|kW|0}} at 5,600 [[revolutions per minute|rpm]] and {{cvt|185|lbft|Nm|0}} of torque at 2,800 rpm. The engine redline is 6,300 rpm.<ref name="2006_LK5">{{cite web|archive-url=https://web.archive.org/web/20160109064824/http://archives.media.gm.com/us/powertrain/en/product_services/2006/Spec%20Sheets/Line%20456/2006%20Line%20I4%20Truck%20(LK5).pdf|url=http://archives.media.gm.com/us/powertrain/en/product_services/2006/Spec%20Sheets/Line%20456/2006%20Line%20I4%20Truck%20(LK5).pdf|archive-date=2016-01-09|title=2006 Vortec 2800 2.8L I-4 (LK5)}}</ref>
Applications:
*
*
==
{{reflist}}
{{commons cat}}
{{GM late engine timeline}}
{{DEFAULTSORT:Gm Atlas Engine}}
[[Category:General Motors engines|Atlas]]
[[Category:Straight-four engines]]
[[Category:Straight-five engines]]
[[Category:Straight-six engines]]
[[Category:Gasoline engines by model]]
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