What is the diff between ls1's and ls2's?
12-02-2005, 09:23 AM
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What is the diff between ls1's and ls2's? I have found out the ls2 just has ls6 heads basically and 16 more cubic inches ... regarding the motors themselves, what is different? What is stronger? What responds better to mods - and why?
12-02-2005, 09:40 AM
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Originally Posted by TexasWS6
I have found out the ls2 just has ls6 heads basically and 16 more cubic inches ... regarding the motors themselves, what is different? What is stronger? What responds better to mods - and why?
edit:: well for one the block is different i heard something about the sleeves baing dry cast or something like that, well basically the way the sleeves where put in is different iam not sure how that goes if u check in the ls7 section one of the shops tore the ls2 down and descrived it in details, they where also talking about the ls2 being less efficient as far as cooling goes, or maibe he said it was the watter pump? not sure there, it is an old write up so the memory is fading.
Last edited by zamboxl; 12-02-2005 at 09:51 AM.
12-02-2005, 11:38 AM
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Originally Posted by freakynipples69
the ls2 heads are basically the same as ls6 heads, just the valves on ls2 heads are different or something. I forget exactly what the small difference was.
12-02-2005, 01:27 PM
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Some significant differences LS1 5.7 versus LS2 6.0 displacement (approximately 350 CI versus 400 CI). LS1 320 HP @ 5800 RPM 330 Ft/Lbs torque @ 4400 RPM LS2 400 HP @ 5900 RPM 400 Ft/ Lbs torque at 4400 RPMS.
LS2 has steel crank versus LS1 cast iron crank. LS2 Cam spec profile similar to LS6. LS1 has knock sensors in valley pan, LS2 has them on opposing sides of the exterior block. Exhaust manifolds and oil pans are different. LS2 has larger intake ports and smaller D-port exhaust ports. LS2 has 8MM red plug wires, LS1 has black.
Various platforms, (F-body, Corvette, GTO) water pumps and accessory drives are basically the same between LS1 versus LS2.
Stock LS1 manifold has 78MM cable throttle body, LS2 has 90 MM fly by wire throttle body with integrated IAC and TPS. LS2 has bigger, single supply, stainless fuel rail & injectors, different wiring connectors to injectors
That's just a few things I've observed working on a few of both engines.
LS2 has steel crank versus LS1 cast iron crank. LS2 Cam spec profile similar to LS6. LS1 has knock sensors in valley pan, LS2 has them on opposing sides of the exterior block. Exhaust manifolds and oil pans are different. LS2 has larger intake ports and smaller D-port exhaust ports. LS2 has 8MM red plug wires, LS1 has black.
Various platforms, (F-body, Corvette, GTO) water pumps and accessory drives are basically the same between LS1 versus LS2.
Stock LS1 manifold has 78MM cable throttle body, LS2 has 90 MM fly by wire throttle body with integrated IAC and TPS. LS2 has bigger, single supply, stainless fuel rail & injectors, different wiring connectors to injectors
That's just a few things I've observed working on a few of both engines.
12-02-2005, 05:10 PM
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We are in the process of checking the oil pressure sending unit. I am confused about it. How does that sensor measure the oil pressure when it just screws into the valley cover? I am sure that underneath the valley cover is not full of oil. Heck, the engine would take gallons of oil instead of quarts. Also, we went the GM dealer here in town to order a new sending unit. He said all he showed was a four pin or two pin sending unit. Our present sending unit only has one pin ??? I took it to them and it confused them....Our sending unit came from behind the intake and is about 3" tall, screws into the top/back of the valley cover....Can you help with any info???
Our problem is that we just put in this LS2. We have no oil pressure at idle but do show pressure when rpms are increased. Back at idle the oil pressure drops to zero....
Our problem is that we just put in this LS2. We have no oil pressure at idle but do show pressure when rpms are increased. Back at idle the oil pressure drops to zero....
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12-02-2005, 06:48 PM
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I do not think the ls2 has a steel crank...it should be the same stroke with different reluctor wheel. The block is siamesed between the cylinder bores which makes it stronger and less prone to cylinder wall distortion compared to ls1/ls6 blocks. The ls2 is a nice block to build a performance engine on.
12-03-2005, 12:06 PM
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[QUOTE=zamboxl]ls2 has ls6 heads???? when did that hapen??? if so then damn they got got cheated they making less power with more cubes than the ls6 engine.
The LS2 heads are basically LS6 heads. The LS2 intake is not that bad, either. The reason that the 2 makes slightly less power than the 6, even with more cubes, is the CAM. The 2 uses the '01 only LS6 cam which is more conservative than the 02 and later LS6 cam. The '01 has different LSA's as well as more advanced lobe centers. Even with this more conservative cam, the 2 is only rated at 5 HP less than the 6 ... and has much more area under the curve.
I would think that changing to the 02 and later ZO6 cam would add at least 20 HP ... the same gain from 385 to 405 that the 02 and later ZO6 enjoyed over the 1st year ('01) LS6.
The LS2 heads are basically LS6 heads. The LS2 intake is not that bad, either. The reason that the 2 makes slightly less power than the 6, even with more cubes, is the CAM. The 2 uses the '01 only LS6 cam which is more conservative than the 02 and later LS6 cam. The '01 has different LSA's as well as more advanced lobe centers. Even with this more conservative cam, the 2 is only rated at 5 HP less than the 6 ... and has much more area under the curve.
I would think that changing to the 02 and later ZO6 cam would add at least 20 HP ... the same gain from 385 to 405 that the 02 and later ZO6 enjoyed over the 1st year ('01) LS6.
Last edited by hangslo; 12-03-2005 at 12:17 PM.
^^^^^^^^^^^^^ 