niphilli

Thought it would be fun to post up what we think might happen with the new line and what we would like to see done.

So far it has been stated and re-iterated by good sources within GM that the LS2 is aiming to crack 400HP in the C6 coupe form, and that the LS7 is aiming to crack 500 HP. No firm statements as of yet.

So whadda ya think? How are they going to get these numbers? Will they share the same block?


Here is my speculation:

LS2:
-After driving around in my Z I have realized that the big *** production cam that is in the LS6 is COMPLETELY streetable, and I have no problem thinking that they may just use a slightly modified version of this 346 powerplant in the base C6 coupes. Using the names LS2 and LS6 makes me think that they will share the same basic architecture of the engines that are in our cars today.

LS7:
-Here is where the fun starts. IMHO there is NO WAY that they are going to add 100 HP to the current 346 without having "Streetablility issues" and staying N/A (which I think they will). I have no idea what is going to take place here except the prospect of more cubes. So I sit down and start to think of the days of old: 302, 327, 350, 396, 427 are all Synonymous with chevrolet. Throw out all < 350 because of streetability concerns and you are left with 396 and 427! I guess the sky is the limit but it has been prooven that the current LSx can be made streetable and emissions legal using a 427 platform. The caddy CIEN V-16 cut in half (if I remember correctly) came up to 414 CI, so how much more would it take in the bore department to make a 427?

What I would like to see for the LS7:
I personally like the idea of a "Big Bore" version of the current LS6 platform using a similar stroke to the current one just in a block with bigger slugs. It has been prooven that 382 all bores can easily make 450 RWHP, but I am not sure if it can be done with a "streetable" cam; And when I am saying "streetable" I mean GMs version of streetable. Sure its all heresay, but so are thoughts of me buying a new Murcialago (SP?) and that thought crosses my mind daily.

So whaddya think?

SSpilot

I think your dreaming, but I wouldn/t complain if it were true.

DrkPhx

iTrader: (15)

I think you'll see 400hp and 450hp realistically from GM.

DONAIMIAN

iTrader: (18)

And you have to also think about how GM rates their cars at the motor not the crank.If GM sticks to tradition (im a bit skeptical after they threw out the hidden lights on the vette) theyre 2 options are the 396 and a 427. Its gona be way easy to make 400 crank out of a 396 and easy to make 500 crank out of a 427. With that 382 all bore it made 450 at the wheels but wasnt strretable, so what GM will mostlikley do is jack up the cubes to gain some streetability. 382 and 396 are pretty close together and the smaller of the engines is gona be able to crank out 400 crank. If you wanted to make 400 crank out of 382 (or in this case a 396) just thing about how small of a cam you could get away with. With goals of 400 and 500 you only have to make 350 and 450 at the wheels. Not that hard in my opinion.

Nine Ball

iTrader: (38)

Someone posted a scanned GM document a couple months ago that gave details on the LS2 and LS7. In summary, the LS2 will remain a 346ci LS1-based engine, similar to the current LS6. The LS7 is a larger bore 6.2L engine. Should easily hit 500 crank hp. My old all-bore 382ci engine pulled 455 rwhp with a tiny T1 221/221 cam in it and idled/drove like stock.

Factory large-bore aluminum blocks. THAT will be sweet....

Tony

niphilli

That is what I like to hear...Maybe my subliminal thoughts have been heard over at GM- I have never liked the idea of Long stroke motors a big bore block version of the 346 would be schweet!

It was posted over on one of the vette forums that they had inside info of a 368 (6.0L) LS2 and a 388 LS7. This would be interesting 'parts bin' engineering. Basically take an Escalade engine, shave the heads down and slip in a Z06 cam and you have the LS2. Enlarge the bore or use a stroker crank and you have the LS7. Interesting but I hope it does not happen. I sure as hell would not want to drive a 'vette and tell people "yeah this is that engine out of the big caddy truck"

Keep it comin!

Hybrid Slow

I wonder if the LS2/7 motors will use GM's new three valve cylinder heads? They supposedly bolt up to current LS1/6 motors...

And there is no way they'd use the iron block from the Escalade. The motors will definitely be all aluminum.

XLR8NSS

iTrader: (4)

Well, I'm pretty sure an aluminum version of the 6.0L is on it's way. I thought the trucks were supposed to be getting them already but, maybe not until next year??? That would be my guess for what block gets used on the LS2 and LS7.

They could use the stock bore(4") with a new stroker crank(3.74") for the 6.2L and a slightly bigger bore of 4.06" with the same crank for the 388ci motor. The iron 6.0L blocks can go out that far right now(if checked) so that is why I used those bore numbers. The fact that they could use the same block and crank for both motors seems logical too.

Also, if you do the math the bore to stroke ratio on those motors is VERY close to a stock LS1/6.

Now 3 valve heads would be SWEET!!

Pro Stock John

iTrader: (34)

I've been hearing there will be a 6.0 motor and a 6.4 motor, both will be all aluminum.

niphilli

How the hell does a 3-valve pushrod head work?

Red Shift

I think the Germans are doing it already, but let me check.

Red Shift

Couldn't find the german one but this one is better. GM 3 ohv

EDIT: Make sure you click to go back to the powertrain index. Check out that six speed auto with a neutral idle feature!!!

niphilli

Wow thanks for posting up! That is some cool stuff. It does have two camshafts though, dont know how you could make it work on a LSx. Mercedes has been using 3 valve heads for a while now, but if I am not mistaken they are OHC engines, not sure on that one. Ferrari uses 5 valve setups, bet the diagram of that one is wild lookin' .

Hybrid Slow

The extra intake valve on the 3 valve cylinder heads is "actuated by a horizontal pushrod given impetus by the parent mechanism." The cylinder heads were featured in a GM exhibit titled "Next Generation OHV." The implication for use with the LSx platform comes from the fact that the heads were bolted to a Gen IV cylinder block... And according to CHP, most--if not all--Gen IV parts will readily bolt to the Gen III cylinder block.

My thinking is that the LS2/7 motors are going to be based off the new Gen IV platform... Therefore I figure if GM is displaying Gen IV motors with 3 valve heads, there might could be some 3 valve Gen IV LSx motors in our future.

Vents

iTrader: (9)

hrmm.. good ideas, but now does it work, and lets see a dynograph..

i like the 2 valves per cylinder idea (prefer 4 ;D) but, more mooving parts = more reliability issues, and more money spent. reguardless of ingenuity, power production ect.. reliability is priority 1.

93Polo

iTrader: (5)

At the Corvetteforum Cruise In Dave Hill (Corvette Chief Engineer) said the dual cam motor will not be in the C6.

I have heard the 6.0 and 6.4 rumor as well. Didn't the Chevrolet SS concept have an aluminum 6.0?

Y2K_WS6_T/A

Anyone know about what the IRL cars are using now, as I heard that most were using the "Next Generation GM Motor" Does that meant C5R or something more newer/better. Anyone have any info on this?


Mir

Crazyquik

Mir, I would think thats all just marketing BS. Those are purpose built race engines, mildly resembling the late Olds Aurora engine. Definently not pushrod.

You can also run 3 or 4 valves with a pushrod motor via Y rockers.

J.

NataSS Inc

iTrader: (9)

I just got through checking out the pictures on the car craft link. the 3 valve design would make for some seiously TALL heads in the way the first picutre shows the cam set up. and the second picture led me to believe that it was a MID engine design. Notice how the TB races the REAR of the motor. OR it is just a reverse faceing intake. Why they would do that, I dont know, but then again I am not an engineer. but for some reason the picture of the complete motr SCREAMED to me MID ENGINE.


EDIT

Ignore the tall valve cover statement. TWIN IN BLOCK CAMS according to hte article.

OctaneZ28

iTrader: (6)

You're right!
As stated on the GM RPO list, the LS2 will be 6.0L and the LS7 will be 6.4L

EDIT:
Here's the exerpt from the GM RPO List: