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

[BlueSkyJaunte]

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.

[kaisen]

Originally Posted by Scott R

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

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?

[Scott R]

Originally Posted by kaisen

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.

[aigel]

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:

The variable valve timing, while new to the Corvette, isn’t as sophisticated as most overhead-cam arrangements. The small-block can shift the valve events by up to 62 degrees, but can’t adjust intake and exhaust valve timing independently. Valve timing is advanced for more torque and retarded for better fuel economy.

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

[kaisen]

Originally Posted by aigel

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.

[VINMAN]

Good ole American V8 HP!

[Heel n Toe]

Originally Posted by pavulon

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

Originally Posted by motion

Its a government dyno. Just believe.

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

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.

[onewhippedpuppy]

Originally Posted by Heel n Toe

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

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.

[vash]

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

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

[Flieger]

Originally Posted by kaisen

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

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.

[masraum]

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

[Jim Bremner]

Originally Posted by onewhippedpuppy

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

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

[Dantilla]

Originally Posted by aigel

The C6 looked too close to the C5.

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.

[Hydrocket]

Originally Posted by Jim Bremner

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

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.

[aigel]

Originally Posted by kaisen

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.

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

[Hydrocket]

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.

[unclebilly]

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

Still pretty awesome.

[Hydrocket]

Originally Posted by unclebilly

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.

[aigel]

Originally Posted by unclebilly

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

Still pretty awesome.

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

G

[Maxim S]

Originally Posted by kaisen

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.

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