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Old 10-24-2012, 07:18 AM   #1
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C7 Corvette - (LT1) Gen V V8 Info

Info is coming in, thanks to Corvette Blogger, from the engine seminar.



(LT1) 6.2L V8 with cylinder deactivation will drop to 3.1 V4 for better fuel economy

450hp or more! 0-60 in less than 4 seconds

Engine to be built at Tonawanda engine plant in Buffalo. 99% new - Power curve similar to LS7

11.5:1 compression ratio. Direct fuel injection, cylinder deactivation; continuously variable valve timing; active fuel management

New engine has a unique and complex piston head.

New LT1 V8 has 50 lb-ft more low-end torque than current LS3 V8; matches the LS7 V8 from the Z06.

Premium fuel recommended, but not required

Spark plug is in the center of the chamber. Intake and exhaust valves are reversed.

There will be an 11.5 quart dry sump oil system available for the new LT1 V8

6,600 RPM fuel cut off in the new LT1 motor

All the new technologies on the LT1 make it a heavier motor than the LS3 (By how much?)

Patent-pending PCV system

Final performance ratings will come in 2013

Peak horsepower around 6,000 RPM; peak torque around 4,000 RPM

New combustion process to be documented in an SAE paper to be published in the Spring of 2013

LT1 is the first OHV engine with Direct Injection

Build Animation Video

Dyno Videos
http://rumors.automobilemag.com/2014...#ixzz2AESkmPwl

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http://media.gm.com/newcorvetteengine

Full Press Release & Full PDF Presentation
http://media.gm.com/media/us/en/gm/n...mallBlock.html

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http://media.gm.com/media/us/en/gm/n...n5/engine.html

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http://media.gm.com/media/us/en/gm/n...-drawings.html

Powertrain Engine Development Center Photo Gallery
http://media.gm.com/media/us/en/gm/n...ng-center.html

Last edited by Chris Draper; 10-24-2012 at 11:05 AM.
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Old 10-24-2012, 07:25 AM   #2
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Last edited by Chris Draper; 10-24-2012 at 09:57 AM.
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Old 10-24-2012, 07:33 AM   #3
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It will be interesting to see what kind of mpg it gets at cruising speed on four cylinders. My LS3 gets around 30 mpg on the highway. I had a Silverado with the cylinder deactivation, and it ran and felt fine on the highway, but the mpg was only a modest improvement.
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Old 10-24-2012, 07:40 AM   #4
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http://www.lsxtv.com/news/breaking-n...-block-reveal/

New cylinder heads will have slightly splayed valves, about 2.5 degrees

Note change reversed position of intake and exhaust valves. Also raised intake ports












Last edited by Chris Draper; 10-24-2012 at 08:36 AM.
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Old 10-24-2012, 07:46 AM   #5
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awesome, thanks!
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Old 10-24-2012, 08:14 AM   #6
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Old 10-24-2012, 08:25 AM   #7
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I wonder the amount of gain a person might see with better breathing? I.E. headers, high flow cats, ect ect?

Does direct injection make a difference when supercharging or turbo charging?

My G8 GT has cylinder deactivation and I don't even notice it. When it comes to modding G8, I hear people removing the cylinder deactivation feature.

If you do FI, do you have to remove the cylinder deactivation?

How much heavier is it then an LS3?
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Old 10-24-2012, 08:48 AM   #8
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Quote:
Originally Posted by Upheval View Post
I wonder the amount of gain a person might see with better breathing? I.E. headers, high flow cats, ect ect?

Does direct injection make a difference when supercharging or turbo charging?

My G8 GT has cylinder deactivation and I don't even notice it. When it comes to modding G8, I hear people removing the cylinder deactivation feature.

If you do FI, do you have to remove the cylinder deactivation?

How much heavier is it then an LS3?
Direct injection LOVES TURBOS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!

The Pontiac Solstice had a 2.4L 170BHP NA motor that was rated at 19/25 and a 2.0L directly injected turbo engine rated at 260BHP and 19/28 with people getting 30+MPG in the real world.

11.5:1 compression ratio and will run on 87 octane fuel, though not making 450/450.
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Old 10-24-2012, 09:01 AM   #9
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So replacing the old 6.2 with a new 6.2 and only a 20hp increase? i don't think so, simply going with DI should have added 50 hp at least.
You can however see the advanced casting methods in the block and heads that contribut to making is a significantly lighter design. The aluminum pistons too should be much lighter.
no word on the weight savings.... I'm sure its a great engine but i was expecting more. there's a lot they're not telling us!
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Old 10-24-2012, 09:02 AM   #10
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Oh, and does anyone see a power steering pump in that drive belt configuration.... are we going electric ????
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Old 10-24-2012, 09:09 AM   #11
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Quote:
Originally Posted by Upheval View Post
I wonder the amount of gain a person might see with better breathing? I.E. headers, high flow cats, ect ect?

Does direct injection make a difference when supercharging or turbo charging?

My G8 GT has cylinder deactivation and I don't even notice it. When it comes to modding G8, I hear people removing the cylinder deactivation feature.

If you do FI, do you have to remove the cylinder deactivation?

How much heavier is it then an LS3?
I would imagine simular gains to the current setup mods verses mods. The amazing thing about DI is the ability to adjust fuel timing. That basically helps cut KR wich is a huge plus for any FI.

I have removed several DOD sysems on g8's. I can easily tell when the car is running in DOD. Throttle response is terrible, just turning off AFM in a tune is a huge improvement. The biggest issues seems to be that the DOD lifters have a high rate of failure (compared to non DOD) and they cannot handle the stress of a large cam.

To remove them you have to pull the heads, swap the lifters, cam, pushrods, and lifter valley cover. Of course since your in there you might as well get the timing chain and tensioner too. Then you have to disable AFM in the software and retune.


Ok one thing I notice on the fuel system. It says one high output pump. There still have to be 2 pumps. One in the tank and one at the motor, according to the pictures.
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Old 10-24-2012, 09:09 AM   #12
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Oh, and does anyone see a power steering pump in that drive belt configuration.... are we going electric ????
2012 ZL1 has electric power steering and now every 2013 Camaro has it.

More shared Camaro parts..........
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Old 10-24-2012, 09:11 AM   #13
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So replacing the old 6.2 with a new 6.2 and only a 20hp increase? i don't think so, simply going with DI should have added 50 hp at least.
You can however see the advanced casting methods in the block and heads that contribut to making is a significantly lighter design. The aluminum pistons too should be much lighter.
no word on the weight savings.... I'm sure its a great engine but i was expecting more. there's a lot they're not telling us!
What they have not stated plainly enough is they were not going for 600BHP in the base model Corvette......
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Old 10-24-2012, 09:19 AM   #14
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I agree. What most people don't understand these days is that we have advanced to the point where it takes ALOT to gain A LITTLE.

450 is still a conservative number and I grantee it will be slightly more then that when the exact numbers come out in January.

Even if it were "just" 450hp/450ftlbs, that is a nice package, and with a substantial gain in low end torque and efficiency, this is good stuff.....and this is just the BASE MODEL!
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Old 10-24-2012, 09:24 AM   #15
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I agree. What most people don't understand these days is that we have advanced to the point where it takes ALOT to gain A LITTLE.

450 is still a conservative number and I grantee it will be slightly more then that when the exact numbers come out in January.

Even if it were "just" 450hp/450ftlbs, that is a nice package, and with a substantial gain in low end torque and efficiency, this is good stuff.
On the flip side is this, you will be able to see great gains with this engine. GM sells a 525BHP LS3 crate engine which beats the LS7 in horsepower and at 489ft-lbs beats it in torque.

With things like VVT, direct injection, and a 11.5:1 compression ratio you will see gains much higher then that on the after market. Do not be shocked to see 600BHP LT-1 engine NA in the not so distant future......

After all we have to remember that the LT-1 uses AFM and there are issues with higher power levels and AFM. Before GM wouldn't go above 400BHP with AFM (L99 V-8 engine) and now they are pushing it to 450BHP. So when tuning the LT-1 engine in the after market AFM has to go ( like they do on automatic SS Camaros).
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