The 2014 Corvette C7's new heart: LT1 6.2L DI VVT small block V8
 

Don't care? Hate GM? Don't read the post



Earlier today GM unveiled the all-new LT1 small block V8 that will power the all-new 2014 C7 Corvette in base form. It is still 6.2 Liters, but benefits from the addition of direct-injection, continuously variable valve timing and active fuel management. It is still dry-sump with a higher capacity variable pump, higher capacity oil cooler, and redesigned 11.5 quart tank.

Officially, they will only say that it makes "at least" 450 horsepower and 450 lb-ft of torque. And they'll only say that the base Corvette will do under 4.0 seconds to 60 mph, and better than the current 2013 Vette's 26 mpg EPA freeway rating.

Some insiders hint that the final SAE rating may be as high as 475 hp

More importantly, they've spent a lot of time optimizing the power curve rather than focusing on peak numbers. For example, the new LT1 makes as much torque from 2000 to 4000 rpm as the current 7.0L (505hp) LS7 in the Z06. It makes at least 400 lb-ft from 2000 rpm to 6000rpm.

It weighs 465 pounds, fully dressed with accessories, harnesses, computer, and engine covers. It is 25.3 inches tall from the lowest part of the sump to the highest part of the top engine cover. Put in perspective, that's 40 pounds lighter and almost 5 inches lower than the BMW 4.4L Twin Turbo rated at 400hp and 450 lb-ft.

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This is the dyno that test the engine to simulated 1.3G loads in acceleration, braking, and cornering to ensure the dry sump system is up to task.

As such, the C7 Corvette's 5 year 100,000 mile powertrain warranty is NOT voided by tracking the car


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I got my info straight from GM, but here is Motor Trend's article that doesa better job than me:

Next-Gen LT1 6.2-Liter V-8 for 2014 Corvette Revealed with 450 HP, New Tech - WOT on Motor Trend

More dyno and tilt dyno (from GM footage)

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I think I maybe pointing out the obvious, but all of the technologies listed above have been in other manufacturers cars for years now. What makes this special?

Awesome, great to see an American pushrod V8 being competitive with nearly anything out there.

They've been in other GM cars for years now too.

But in the 100 million small blocks over the past 57 years this is the first time direct injection has been adapted, and the outputs, efficiencies, and durabilities are impressive -- esp given the costs

Cool, pushrods!

No kidding! It makes for a much lighter and more compact package!

Sounds like they need faster computers at their development offices.............I think I still have a 286 CPU PC witha 1200 baud modem kicking around in my shed if they need help.


Quote "Millions of hours of computer processing time was spent developing the top surface of the piston to optimize air-fuel mixture flow and combustion dynamics. Hundreds of combustion systems were analyzed. Over 6 million hours of computer processing time was dedicated to combustion system optimization while reducing knock sensitivity even under extreme climatic conditions........"

Totally cool. Can't wait to see the car. I wish Ford had towed the line with the Thunderbird.

Pretty impressive, I doubt anything else provides more power for less money. If they can get the same power and MPG out of a simple pushrod V8, what does that say about the more expensive and complicated options?

This must be the GEN V engine.

I guess it just doesn't "wow" me like that S8 you posted. But I'm pretty sure that's because this type of car is not in my demographic.

how would a static but tilting dyno simulate 1.3g's?

Its a government dyno. Just believe.

Yes, Gen V

The upcoming all-new full size trucks (out next year) will share the same basic motor, but different displacements and power targets

I've heard the Silverado's 5.3L at 365 hp and 405 lb-ft while earning a 24 mpg freeway rating

It's also half the price, and the base model

It should be quicker than the base 991 in every measure, while getting better fuel economy. In that sense it's relateable to Porsche fans.

I meant "my demographic" as in I still have all my original hair. :)

If you tip a motor on its side, the oil is experiencing +1G in lateral load relative to the engine's normal orientation (on its nose = braking, on its tail = accel)

When the tilt dyno moves abruptly, it's able to amplify peak loads to greater than 1G

They've done more than 1.5 million miles of real road testing on the LT1 version alone, in addition to dynos

If GM continues in the spirit of the C5 Z06, I will never have a bad thing to say about modern Corvettes. I drove a C5 Z06 around the GM track here and it knocked my socks off, to put it mildly.

I think that one "only" had 405hp.

Would love to own one, but it would mean having to get rid of the 911. Not gonna happen.

The average age of a new 991 buyer last year was 52

The average age of a new Corvette buyer last year was 54

Do you lose all your hair between 52 and 54?

I have no idea.

I was wondering how you achieve variable valve timing with pushrods and a single cam?

Apparently you don't - at least not independently for int / exh:

Read more: 2014 Chevrolet Corvette C7 Gains New LT1 6.2-Liter V-8 - Rumor Central

I sure am glad I am not a Corvette buyer. The new model tops the old by quite a bit every time. I am looking forward to seeing their body redesign. The C6 looked too close to the C5.

G

Tadge Juechter, the executive chief engineer for Corvette wanted to do a concentric two-piece cam which allowed bi-phasing (the new Viper has it) but when they tested prototypes the gains simply weren't there relative to the cost, complexity, and fragility.

So it is possible to phase both intake and exhaust at the same time

Expect the C7 styling to be evolutional, like C6 was to C5, with only a couple distinct/notable differences in the coupe version. It will be shorter, with shorter overhangs, and smaller overall.

The interior will be a huge (needed) change in the right direction

The biggest news (imho) will be overall weight and mass distribution. I know the target is 3,000 pounds.

Good ole American V8 HP! :cool:

I don't care who you are, that's funny right there. :D

Thank you, motion. :)

Sweet engine. Somebody's gonna want to buy one off the shelf and put it in an S-10 or an old Camaro.

The new Ford Coyote 5.0 motors are about $5k, complete and ready to install. I want to put one in my Mustang.:)

you wont get me hating on a corvette...i pretty much like them all..

well, maybe not the ones from the charlies angels years..:D the mustang II's were worse..haha

The dyno tilts. The "abrupt" tilt is angular acceleration. To get simulated lateral g's you would need to translate the engine, not just tilt.

However, if you tilt the dyno 45 degrees (and hold it there), that simulates 1 g cornering since there is now as much force pushing down on the oil as there is pushing laterally. If you tilt more than 45 degrees you get a higher simulated lateral g force.

It's love to have one to hoon around in from time to time.

The Coyote 5.0 is over 600 pounds if I remember. and is HUGE on the outside.

I've never liked the C5. Ugliest Corvette ever, as the proportions were way off.

Yet I like the C6. Just a freshening of the same style, but they fixed the goofy proportions.

I've enjoyed every Corvette I've ever driven. I like the massive V8 grunt.
Horsepower per dollar, it's tough to beat a small-block Chevy.

Wrong. The Coyote is lighter than the LSx engines. (444lbs vs 466 lbs) It's also shorter by 2.6 inches, and is the same height. It is however 4.3 inches wider...but that's because of the wider DOHC heads.

That sounds like it is going in the right direction. Most cars get bigger with every new model, including sports cars. Porsche is very guilty of that.

G

I guess perhaps I was expecting too much from this new engine. When I heard that the supposed "world leader" in V8 engines was investing $1 billion dollars for the next generation V8, I had very high hopes.

So we end up with:

6+ liters displacement, cylinder deactivation, DI, variable valve timing and 450+ HP. Not bad...except that the Hemi from Chrysler was doing this 3 years ago (no DI, however). And in 392 guise, it makes more power AND torque. This from Chrysler who was on their deathbed when the 392 was tweaked. And I'm rather certain no one will ever accuse Chrysler of being master of the V8. Nor did they need $1 billion to develop it.

Then we can look at the Ford 5.0 Coyote engine. It's one of the lightest V8 on the market, fairly compact and in Boss tune, makes nearly the same HP at 444. It will be DI next round, as the casting bosses are already in place. In terms of specific output, the 5.0 makes nearly 90 HP/L vs 73HP/L.

I dunno...maybe my expectation were unreal. Really...the new GM V8 isn't anything fantastic all things considered.

Any details on the vvt mechanism? I can't imagine this being all that variable given 1 cam and pushrods.

Still pretty awesome.

The best description I can give is based on other cars with a similar design...think of a cam within another cam. That's the easiest way I can explain it.

Post 24 and 25 in this thread will answer these questions. Do you guys ever read threads or just post :)

G

That raises the question: how long until somebody puts one in a 996?