Is this an ECOTEC?
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From: Harker Heights, TX
Thats actually an Atlas, which is GMs current family of straight engines for trucks and other high torque/low rpm usage. There are a lot of similarities between them and the ecos. evolutionary divergence basicly.
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From: Az
THATS the engine chevrolet should have used in the SS 
Imagine the torque that engine would put down supercharged.
It has a 3.8 X 4.0 Bore/Stroke
What are the major differences between the two infin?
Imagine the torque that engine would put down supercharged.
It has a 3.8 X 4.0 Bore/Stroke
What are the major differences between the two infin?
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From: Harker Heights, TX
Originally Posted by LLV
The straight-4 LLV engine is sold as the Vortec 2900 in GM trucks. It shares the same 95.5 mm bore and 102 mm stoke as the LLR Vortec 3700. The LLV displaces 2.9 L and produces 185 hp (138 kW) @ 5600 RPM and 195 ftˇlbf (263 Nˇm) @ 2800 RPM. Engine redline is 6300 RPM.
But they do produce a hell of a lot of torque in a very flat curve. From ~2k all the way to 5.5k rpms the engine is putting out 175+ lbs of torque.
Originally Posted by Atlas Engine Family
Atlas is a name for a family of modern inline piston engines for trucks from General Motors. 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 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.
However, if you built one out of aluminum, balanced it a little better to rev higher, put a cam that traded some torque for more top end in there, etc... well... you would pretty much have a 2.9L eco with only half way VVT. Well, close but not quiet, since they have been developing separately for over 10 years now.
Last edited by InfinityzeN; Dec 21, 2007 at 07:52 PM. Reason: adding
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From: Az
Oh yea, although they rev higher, 5.5~5.6k is the top of their cam. The grind they use is designed to start building lots of torque down low and hold it.
However, if you built one out of aluminum, balanced it a little better to rev higher, put a cam that traded some torque for more top end in there, etc... well... you would pretty much have a 2.9L eco with only half way VVT. Well, close but not quiet, since they have been developing separately for over 10 years now.
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From: Spring Hill, Tennessee
Nope. Look at the oil filter. It's on the bottom.
On the Eco...well the 2.2 and 2.4's, the belt only goes around the crank, alternator, a/c, and tensioner. The power steering pump is driven off the intake cam. On that motor...not so much.
On the Eco...well the 2.2 and 2.4's, the belt only goes around the crank, alternator, a/c, and tensioner. The power steering pump is driven off the intake cam. On that motor...not so much.
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From: Keystone Heights, Fl
They have an I4 and an I5. Actually when I went up to pick up my Cobalt Wednesday, my tech buddy had the head off of one of the I4's. I got a chance to check it out. They are pretty simalar to our Eco's but they surely aren't the same.
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The Atlas and Ecotec are divergences of the same family as I said earlier. One of the big differences though is that the Atlas is designed for RWD applications, while the Ecotec is designed for FWD applications.
And trust me, if you want to make it a performance engine your going to change the cams and push the torque curve higher up the RPM band. Plus do a whole lot of work to help the engine rev better. As it is now, it doesn't rev nearly fast enough to be a performance engine and really you won't take it above about 3.5~4k rpms.
Also, their a whole lot taller then the Ecotecs.
And trust me, if you want to make it a performance engine your going to change the cams and push the torque curve higher up the RPM band. Plus do a whole lot of work to help the engine rev better. As it is now, it doesn't rev nearly fast enough to be a performance engine and really you won't take it above about 3.5~4k rpms.
Also, their a whole lot taller then the Ecotecs.
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From: Az