Chevrolet to reveal C8 Corvette Z06 today at noon

Colin
By Colin Wood
Oct 26, 2021 | Chevrolet, Corvette, z06, C8

Photograph Courtesy Chevrolet

Why reveal a new model at a car show when you can show a half-hour film dedicated to the creation of that new car?

That’s exactly what Chevrolet has done for the reveal of the C8-chassis Corvette Z06. That film, “Putting the World on Notice,” debuts today, October 26, at 12:00 p.m. Eastern and can be viewed at chevy.com/Z06 or at the video below:


The film will feature “professional basketball superstar, gold medalist and avid car enthusiast, Devin Booker, and record-breaking performance builder and driver, Emelia Hartford, will join General Motors’ passionate engineers and designers to learn what it takes to create the all-new 2023 Chevrolet Corvette Z06.”

Following the film, Chevrolet will be hosting a panel discussion featuring “Corvette and third-party experts” to talk about the new Z06.

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STM317
STM317 UberDork
10/26/21 11:08 a.m.
ChrisTropea
ChrisTropea Associate Editor
10/26/21 11:10 a.m.

Wow the LT6 will rev to 8600. Anyone else have thoughts on the Z06 so far? 

Colin Wood
Colin Wood Associate Editor
10/26/21 11:16 a.m.

And here it is:

A few quick facts:

  • 5.5-liter N/A LT6 flat-plane crank V8 good for 670 horsepower at 8400 rpm and 460 lb.-ft. of torque at 6300 rpm backed by an eight-speed dual-clutch with a shorter final drive.
  • Standard reconfigurable rear spoiler
  • Available Z07 package can provide "734 pounds of downforce at 186 mph, more than any Corvette ever," plus adds carbon-ceramic brakes
  • Electronica limited-slip differential
  • Launch control

More pictures to come in a few.

STM317
STM317 UberDork
10/26/21 11:18 a.m.

A red corvette isn't exactly original, but here's what I came up with on my first run through the configurator. Red with red calipers. I wanted the carbon wheels, which automatically includes the ZO7 package. Fabric seats with red belts. I like the two tone option available on the convertible:

STM317
STM317 UberDork
10/26/21 11:28 a.m.

Brown coupe with bronze wheels, tan interior and glass roof isn't bad either, although I wish the wheels and interior were a bit closer in color:

Colin Wood
Colin Wood Associate Editor
10/26/21 11:38 a.m.

Z07 package:

LT6 engine:

"Standard" Z06:

Driven5
Driven5 UltraDork
10/26/21 11:43 a.m.

Looks (and sounds) like a fantastic 'drivers' car for magazines and low mileage accumulation collectors... I'm substantially skeptical of that engines long-term durability and maintainability as a higher mileage accumulation enthusiast car though. I wonder how long until you can get similar kit with a cross-plane engine trim.

Keith Tanner
Keith Tanner GRM+ Memberand MegaDork
10/26/21 11:45 a.m.

Given Ford's experience with the flat plane Voodoo, it'll be interesting to see if the General releases the LT6 as a crate. GM seems a little more crate-happy than Ford overall but it's my understanding that flat planes are not easy to just drop in. Even JW Automotive Engineering had all sorts of trouble with the flat-plane DFV when they tried to use it for endurance racing.

STM317
STM317 UberDork
10/26/21 11:55 a.m.

Optional full carbon wheels are 20X11 in front and 21X13 in the rear and reportedly save 41lbs of unsprung mass:

adam525i
adam525i GRM+ Memberand Dork
10/26/21 12:01 p.m.

In reply to STM317 :

Do they come in a chrome finish though? lol

Pete. (l33t FS)
Pete. (l33t FS) MegaDork
10/26/21 12:33 p.m.

130+ horsepower per liter!  Criminy.

j_tso
j_tso GRM+ Memberand HalfDork
10/26/21 12:46 p.m.
Keith Tanner said:

Even JW Automotive Engineering had all sorts of trouble with the flat-plane DFV when they tried to use it for endurance racing.

I remember John Horsman(?) said the DFV was only designed to run for 4 hours and Cosworth wasn't interested in developing it for Le Mans.

The C8.R had some vibration issues at its first Daytona 24 but I think they've solved those problems.

Keith Tanner
Keith Tanner GRM+ Memberand MegaDork
10/26/21 12:48 p.m.

I'll have to go back to Racing In The Rain and see what Horseman says specifically, but vibration problems were the big complaint.

Keith Tanner
Keith Tanner GRM+ Memberand MegaDork
10/26/21 12:49 p.m.
Pete. (l33t FS) said:

130+ horsepower per liter!  Criminy.

And on a big engine, too. All the tech developed to make ICE super-efficient and clean has some nice tradeoffs.

ProDarwin
ProDarwin MegaDork
10/26/21 12:52 p.m.
STM317 said:

Optional full carbon wheels are 20X11 in front and 21X13 in the rear and reportedly save 41lbs of unsprung mass:

Cool.

There are still not SCCA legal, right?

TR7 (Forum Supporter)
TR7 (Forum Supporter) Reader
10/26/21 1:32 p.m.

Sooo.... no more pushrods? Is it now worthy of competing with imports (I say in jest). 

Keith Tanner
Keith Tanner GRM+ Memberand MegaDork
10/26/21 1:35 p.m.

Corvette dropped pushrods once before. It didn't stick :)

I think I need to find dimensions of this critter.

RossD
RossD MegaDork
10/26/21 1:50 p.m.

GM also put the starter in the valley of a V8 once before too.

Is that still the standard bellhousing pattern?

Pete. (l33t FS)
Pete. (l33t FS) MegaDork
10/26/21 1:55 p.m.
Keith Tanner said:
Pete. (l33t FS) said:

130+ horsepower per liter!  Criminy.

And on a big engine, too. All the tech developed to make ICE super-efficient and clean has some nice tradeoffs.

It has got to have bores in the 100mm+ range to have enough valve area to make that power.  Normally bores that large translate poorly for efficiency. 460 ft-lb is roughly 83-84 ft-lb/liter, about normal for a very well sorted, much smaller DOHC engine.

Interesting.

 

06HHR (Forum Supporter)
06HHR (Forum Supporter) Dork
10/26/21 2:12 p.m.

In reply to RossD :

Looks a bit different, here's the GenV LT1 from 2014, 

 

Google-fu is failing me right now for a rear shot of a C8-spec LT2 EDIT:  Found one!  Slight difference from the LT1 bellhousing pattern, which itself is different from the Gen IV LS engines.

ProDarwin
ProDarwin MegaDork
10/26/21 2:13 p.m.
Pete. (l33t FS) said:

It has got to have bores in the 100mm+ range to have enough valve area to make that power.  Normally bores that large translate poorly for efficiency. 460 ft-lb is roughly 83-84 ft-lb/liter, about normal for a very well sorted, much smaller DOHC engine.

Why?  In the Honda K48 thread they are estimating 700hp using stock K24 heads which have an 86mm bore.

Is there a rule of thumb on total bore size vs. maximum power?

tuna55
tuna55 MegaDork
10/26/21 2:16 p.m.

Really cool engine, though I am sad to lose the neat packaging of the pushrods, which, obviously, a mid engined car does not need.

 

The car is still pretty ugly.

Colin Wood
Colin Wood Associate Editor
10/26/21 2:52 p.m.

Engine specs? Engine specs:

Pete. (l33t FS)
Pete. (l33t FS) MegaDork
10/26/21 3:21 p.m.
ProDarwin said:
Pete. (l33t FS) said:

It has got to have bores in the 100mm+ range to have enough valve area to make that power.  Normally bores that large translate poorly for efficiency. 460 ft-lb is roughly 83-84 ft-lb/liter, about normal for a very well sorted, much smaller DOHC engine.

Why?  In the Honda K48 thread they are estimating 700hp using stock K24 heads which have an 86mm bore.

Is there a rule of thumb on total bore size vs. maximum power?

Bore diameter reduces detonation resistance.  More distance between the spark plug and the ends of the chamber means more time for knock to happen.

Is the "K48" 50-state compliant for 2022 emissions?  That would seem to equate to two 350hp engines, not 200hp-ish like are emissions certified.

itsarebuild
itsarebuild Dork
10/26/21 4:44 p.m.

I have the same non-existent use case for this as I do for the super cars it is chasing. 
 

putting on the nomex.......

 

Rigante
Rigante Reader
10/26/21 5:02 p.m.

heads look pretty compact for DOHC

Keith Tanner
Keith Tanner GRM+ Memberand MegaDork
10/26/21 5:27 p.m.

In reply to Rigante :

No kidding, I couldn't tell it was DOHC from the pics. Had to go look at the specs. Still a small engine.

codrus (Forum Supporter)
codrus (Forum Supporter) GRM+ Memberand PowerDork
10/26/21 5:47 p.m.

I assume there's no manual option?

 

dps214
dps214 Dork
10/26/21 7:34 p.m.

In reply to codrus (Forum Supporter) :

Apparently no option for a front bumper that looks like it was designed by adults, either.

Pete. (l33t FS)
Pete. (l33t FS) MegaDork
10/26/21 7:44 p.m.
codrus (Forum Supporter) said:

I assume there's no manual option?

 

DSG.

After seeing the NVH mess of the GT350, I'm sure Chevy was adamant in not wanting a direct connection between the cabin and drivetrain.

 

Speaking of GT350, I also notice that the intake is set up as two four cylinder intake plenums, the way everyone else does an even firing V8, and not a single plenum, which is apparently why Ford needed the weird (for a four cylinder) crank throw arrangement.

 

The compactness of the valve covers makes me think it uses a cam drive like the High Feature V6, which allowed GM to have fairly small cam sprockets.  Depending on how much of the cam drive was reused, this would also introduce a commonality of parts.  The timing cover scares me from a service perspective: it's apparently also the coolant manifold.  I mean, I guess technically it is on the High Feature, too, but the grandioseness of the cover design makes me wonder if GM is (finally) introducing coolant on the exhaust sides of the engine, where the heat is.

ShawnG
ShawnG UltimaDork
10/26/21 8:18 p.m.
Keith Tanner said:

In reply to Rigante :

No kidding, I couldn't tell it was DOHC from the pics. Had to go look at the specs. Still a small engine.

The cam plugs in the head weren't a dead giveaway?

ShawnG
ShawnG UltimaDork
10/26/21 8:19 p.m.

In reply to Pete. (l33t FS) :

Could be like Toyota's narrow angle heads. Sprocket drives one cam and the second cam is geared to the first.

Pete. (l33t FS)
Pete. (l33t FS) MegaDork
10/26/21 8:33 p.m.

In reply to ShawnG :

Those doodads on the valve cover are VVT actuator solenoids (everyone has a different term), like a Mercedes or VW or similar.  Here's a cutaway of a Mopar 3.6.

Given the shape of the valve covers, my money's on single chain per bank driving both cams directly.  Like a High Feature.  smiley  On a low production engine like this, I bet there is a lot of "go with what you know" happening here, to minimize expense.  I don't think GM has ever made a DOHC engine where one cam was driven by the other, come to think of it.  Not that they CAN'T do it, but why change what works?

 

From a service perspective, I'm seeing things like bank 2 actuators failing because the oil tank is wrapped around that side of the engine, cooking them.  Actuator replacement on a Mercedes is like a half hour job.  On this, I bet step one is drop engine, so you can peel the oil tank off.

 

 

Keith Tanner
Keith Tanner GRM+ Memberand MegaDork
10/26/21 8:39 p.m.

In reply to ShawnG :

Well, maybe now :) The DOHC engines I spend the most time with do not have cam plugs, but all of the variants do have very clear cam drives on the front whilst this one does not. 

ShawnG
ShawnG UltimaDork
10/26/21 8:43 p.m.

Cool.

The newest engine I've played with is the one in my 2013 Escape. I'm more familiar with stuff from 70 years ago than I am with modern engines.

RichardSIA
RichardSIA Dork
10/27/21 12:07 a.m.

Looks like they kept the flat-plane stroke short enough to avoid a lot of issues.
Wonder how it was decided, computer or test engines?


Having worked with Carbon Fiber professionally (and seen the failures) I have to wonder what the MTBF is for those CF wheels?
Recommended replacement after how many miles?
I would not use them even if they were free.

Funny how GM wants it both ways, king of the hill bragging rights for ICE engineering, then abandon it all for EV's in just a few years. 

STM317
STM317 UberDork
10/27/21 4:44 a.m.
Pete. (l33t FS) said:

In reply to ShawnG :

Those doodads on the valve cover are VVT actuator solenoids (everyone has a different term), like a Mercedes or VW or similar.  Here's a cutaway of a Mopar 3.6.

Given the shape of the valve covers, my money's on single chain per bank driving both cams directly.  Like a High Feature.  smiley  On a low production engine like this, I bet there is a lot of "go with what you know" happening here, to minimize expense.  I don't think GM has ever made a DOHC engine where one cam was driven by the other, come to think of it.  Not that they CAN'T do it, but why change what works?

 

Looks like the crank is connected to a central cam (used to drive the HPFPs located in the valley), and each bank's cams are then driven from the HPFP central cam:

This is a screen grab from an animation on the official ZO6 reveal website:

*Other interesting tidbits from that site:

-the ports and combustion chambers are CNC machined

-the intake manifold has a lot going on to control/optimize airflow. The 3 valves in between the banks function differently depending on engine rpm and engine control mode:

STM317
STM317 UberDork
10/27/21 4:52 a.m.
RossD said:

GM also put the starter in the valley of a V8 once before too.

Is that still the standard bellhousing pattern?

This engine has the starter, alternator and both of the cam-driven high pressure fuel pumps in the valley.

This article has some interesting tidbits and photos of a "cutaway" display of this engine

akylekoz
akylekoz SuperDork
10/27/21 5:44 a.m.

In reply to STM317 :

Whoa Wow, that intake.

Pete. (l33t FS)
Pete. (l33t FS) MegaDork
10/27/21 5:49 a.m.

Thanks for the pics!  Lots to process in there.

NickD
NickD MegaDork
10/27/21 6:22 a.m.

The C8 styling isn't working for me. And *ducks and covers* I don't think flat-plane V8s sound as good as everyone makes them out to. I'm curious to see if this engine is less of a time bomb than the GT350 engine.

Ian F (Forum Supporter)
Ian F (Forum Supporter) MegaDork
10/27/21 6:48 a.m.
ShawnG said:
Keith Tanner said:

In reply to Rigante :

No kidding, I couldn't tell it was DOHC from the pics. Had to go look at the specs. Still a small engine.

The cam plugs in the head weren't a dead giveaway?

Those look like Cam Position Sensors.

I'm guessing that big, plastic tank on the passenger side is the dry sump oil reservoir?

Keith Tanner
Keith Tanner GRM+ Memberand MegaDork
10/27/21 8:05 a.m.
akylekoz said:

In reply to STM317 :

Whoa Wow, that intake.

And you know that someone's going to put carbs on it...

ProDarwin
ProDarwin MegaDork
10/27/21 8:13 a.m.

Is it weird that the alternator isn't vented in any way?  How is it cooled?

 

rslifkin
rslifkin UberDork
10/27/21 8:27 a.m.
ProDarwin said:

Is it weird that the alternator isn't vented in any way?  How is it cooled?

Maybe they took a page out of the BMW playbook and water cooled it?

Cactus
Cactus HalfDork
10/27/21 8:28 a.m.

I miss manuals.

 

It'll be interesting to see how this flat plane thing holds up long term.

Pete. (l33t FS)
Pete. (l33t FS) MegaDork
10/27/21 9:17 a.m.
ProDarwin said:

Is it weird that the alternator isn't vented in any way?  How is it cooled?

 

I am assuming water cooled, which is getting to be not uncommon on newer mega-amp alternators.  Practically speaking, in this car, it probably gets no meaningful airflow for the fan to move around.  An alternator fan might just recirculate the same air that it just vented.

tuna55
tuna55 MegaDork
10/27/21 10:09 a.m.
Keith Tanner said:
akylekoz said:

In reply to STM317 :

Whoa Wow, that intake.

And you know that someone's going to put carbs on it...

I would totally dual-quad-tunnel-ram this for Tunatruck. It would probably make more power.

tuna55
tuna55 MegaDork
10/27/21 10:11 a.m.
akylekoz said:

In reply to STM317 :

Whoa Wow, that intake.

Looks a lot like this but wirh shorter runners. I think I learned something about runner length and plenum volume and how the plenum only has to be loosely related to the trumpets

pres589 (djronnebaum)
pres589 (djronnebaum) UltimaDork
10/27/21 12:53 p.m.

I think painting some of the black trim to the same as the body color would help a lot.  This thing is covered in gingerbread.

I wonder if Callaway or someone similar could put in a long sunroof on the coupe, basically like the recent 911 Targa models.  The convertible C8 looks kind of meh to me.

CyberEric
CyberEric Dork
10/27/21 5:33 p.m.

Amazing power numbers from a 5.5! Highest output NA V8 of all time. Apparently it shook the oil filter off during testing it's so rough. They had to switch to canister style according to one mag I read.
 

I won't be surprised if this is a maintenance nightmare, but hey, that makes it more exotic!

Opti
Opti Dork
10/28/21 8:06 a.m.

Im really excited about this, but I think they missed the boat on calling it the LT6. It probably should have been named the LT5 ala the C4 DOHC engine.

Im hoping GM is smart enough to have learned from Ford with the Voodoo, but if not, they will probably release all the good stuff with the base engine in a Grand Sport for people that actually want to track them, and dont want a super exotic motor

tuna55
tuna55 MegaDork
10/28/21 8:37 a.m.
Opti said:

Im really excited about this, but I think they missed the boat on calling it the LT6. It probably should have been named the LT5 ala the C4 DOHC engine.

Im hoping GM is smart enough to have learned from Ford with the Voodoo, but if not, they will probably release all the good stuff with the base engine in a Grand Sport for people that actually want to track them, and dont want a super exotic motor

They already used the LT5 briefly, but otherwise I think you're right. Maybe the LT5'

Opti
Opti Dork
10/28/21 8:52 a.m.

In reply to tuna55 :

Thats right. The C7 Zr1 was LT5, I forgot about that one.

Appleseed
Appleseed MegaDork
10/28/21 12:55 p.m.

The recycling of old engine designations is dumb to me. I got an LT1. Which one? The original,  the stepchild,  or the LS?

Imagine an electric Toyota with a motor designated 2JZ? Its confusing and unimaginative.

Engine is cool. Name is dumb.

iansane
iansane HalfDork
10/28/21 1:05 p.m.

In reply to Appleseed :

I tend to agree with this when there are so many differing names for GM engines already. Even in the LS family there are two dozen at least! Why recycle when you're already dumping alphabet soup on everyone.

Pete. (l33t FS)
Pete. (l33t FS) MegaDork
10/28/21 2:49 p.m.
Appleseed said:

The recycling of old engine designations is dumb to me. I got an LT1. Which one? The original,  the stepchild,  or the LS?

Imagine an electric Toyota with a motor designated 2JZ? Its confusing and unimaginative.

Engine is cool. Name is dumb.

Which LS, the aluminum engine from the 90s or the big block engines from the 70s?

The LS6 got its name for a very specific reason.

RX Reven'
RX Reven' UltraDork
10/28/21 3:04 p.m.
Pete. (l33t FS) said:

130+ horsepower per liter!  Criminy.

That's so cute...my 2005 RX-8 made 181.5 Hp per liter. cheeky

barefootskater (Shaun)
barefootskater (Shaun) PowerDork
10/28/21 3:20 p.m.

I wonder how long until someone slaps that shiny new 632 in one of these..

They could call it the Z0632. 

Pete. (l33t FS)
Pete. (l33t FS) MegaDork
10/28/21 3:28 p.m.
RX Reven' said:
Pete. (l33t FS) said:

130+ horsepower per liter!  Criminy.

That's so cute...my 2005 RX-8 made 181.5 Hp per liter. cheeky

471hp? Cool! wink

z31maniac
z31maniac MegaDork
10/28/21 3:50 p.m.
Pete. (l33t FS) said:
RX Reven' said:
Pete. (l33t FS) said:

130+ horsepower per liter!  Criminy.

That's so cute...my 2005 RX-8 made 181.5 Hp per liter. cheeky

471hp? Cool! wink

Renesis is 2.6 L. devil

Appleseed
Appleseed MegaDork
10/28/21 8:58 p.m.

In reply to Pete.

See how easy it is to never be 100% sure which engine we're talking about?

iansane
iansane HalfDork
10/29/21 9:27 a.m.
Pete. (l33t FS) said:

The LS6 got its name for a very specific reason.

Because GM likes to reuse RPO codes.

Rigante
Rigante Reader
10/29/21 11:17 a.m.

flat plane v8s are set up like 2 4 cylinder engines, the plenums will be independent at times and the butterflies between them will play with the volume and resonance on demand. I can't see why a flat plane crank is any worse, Ferrari etc have made them for years, 

Keith Tanner
Keith Tanner GRM+ Memberand MegaDork
10/29/21 11:20 a.m.

We were joking at work yesterday about how GM has managed to duplicate the VICS system that was introduced in the Miata in 1998 :) It had butterflies that increased the volume of the plenum. Interestingly, it wasn't for a shorter intake tract like people assume, it was more of a resonance chamber. And you could see the effects on the dyno.

buzzboy
buzzboy SuperDork
10/29/21 11:51 a.m.
z31maniac said:
Pete. (l33t FS) said:
RX Reven' said:
Pete. (l33t FS) said:

130+ horsepower per liter!  Criminy.

That's so cute...my 2005 RX-8 made 181.5 Hp per liter. cheeky

471hp? Cool! wink

Renesis is 2.6 L. devil

I'm calling it a 3.9 which makes it 544hp! Dang!

mainlandboy
mainlandboy Reader
10/29/21 1:50 p.m.
buzzboy said:
z31maniac said:
Pete. (l33t FS) said:
RX Reven' said:
Pete. (l33t FS) said:

130+ horsepower per liter!  Criminy.

That's so cute...my 2005 RX-8 made 181.5 Hp per liter. cheeky

471hp? Cool! wink

Renesis is 2.6 L. devil

I'm calling it a 3.9 which makes it 544hp! Dang!

Am I missing something here?

Keith Tanner
Keith Tanner GRM+ Memberand MegaDork
10/29/21 2:40 p.m.

You're missing the long-standing disagreement about how to measure displacement of a rotary  :)

Appleseed
Appleseed MegaDork
10/29/21 4:43 p.m.

In reply to Keith Tanner :

One thing we can all agree on is that its probably already broken.

BlueInGreen - Jon
BlueInGreen - Jon UltraDork
10/30/21 9:55 p.m.

What a car. I like the orange. Shoulda just used the C8.R bodywork :D

On the engine subject: the mid engined Corvette is a badass race car, but I gotta say I miss the old school V8 rumble of the C7 racecars

engiekev
engiekev HalfDork
10/31/21 6:30 a.m.
BlueInGreen - Jon said:

What a car. I like the orange. Shoulda just used the C8.R bodywork :D

On the engine subject: the mid engined Corvette is a badass race car, but I gotta say I miss the old school V8 rumble of the C7 racecars

Wouldn't be surprised if a "C8.R" edition came out with similar livery, they kinda already did this with the C8 IMSA edition. 

https://gmauthority.com/blog/2021/06/heres-who-the-2022-corvette-stingray-imsa-gtlm-special-edition-is-for/

Can't wait for what's next with this, not that I or most anyone on the GRM forum is a potential customer (is anyone planning on buying one??).  Rumors are abound, but using common sense here: why would GM spend millions to develop a bespoke flat plane V8 and only have one variant?  There will likely be more variants coming, 670HP is just the start.

 

engiekev
engiekev HalfDork
10/31/21 6:57 a.m.
Pete. (l33t FS) said:
ProDarwin said:

Is it weird that the alternator isn't vented in any way?  How is it cooled?

 

I am assuming water cooled, which is getting to be not uncommon on newer mega-amp alternators.  Practically speaking, in this car, it probably gets no meaningful airflow for the fan to move around.  An alternator fan might just recirculate the same air that it just vented.

There are engine compartment fans that flow quite a bit of air, so liquid cooled is not necessarily a given.

https://www.thedrive.com/news/42896/heres-everything-corvette-z06-engineers-did-to-beat-overheating-issues

Opti
Opti Dork
11/1/21 9:50 a.m.

I believe when the engines leaked the zr1/Zora will also be the 5.5 with turbos. Don't know if it will be FPC but using the rest of it would be a good way to spread developmental costs out. 

But when you're dealing with halo cars they can also be accounted as marketing and don't always have to make good business sense in just sales vs costs. Pretty much all manufacturers have done this and GM did it with a weird motor in the corvette in the 90s, the LT5, there was no other variants of that motor.

STM317
STM317 UberDork
11/1/21 10:46 a.m.
Opti said:

I believe when the engines leaked the zr1/Zora will also be the 5.5 with turbos. Don't know if it will be FPC but using the rest of it would be a good way to spread developmental costs out.

Definitely seems like the same basic architecture:

More CAD Images Show The Mid-Engined, C8 Corvette's Twin-Turbo, DOHC, LT7  In All Its Digital Glory - Gallery | Top Speed

Combine that with the extra space in the nose of the C8 for an electric motor, and the space in the tunnel for a battery, and things could get pretty interesting.

 

But then again, GM recently killed a brand new, $16 million engine platform after putting it into a total of ~800 vehicles, sooooo......who knows.

CyberEric
CyberEric Dork
11/1/21 9:46 p.m.

And GM has needed a little... ahem, help, before.

Keith, I was thinking the same thing with regard to the Mazda VICS system when reading about this motor.

All ribbing aside, I think it's cool they are offering a truly bespoke engine in what is supposed to be a special car, and the numbers are bonkers.

Pete. (l33t FS)
Pete. (l33t FS) MegaDork
11/2/21 5:13 a.m.
Opti said:

But when you're dealing with halo cars they can also be accounted as marketing and don't always have to make good business sense in just sales vs costs. Pretty much all manufacturers have done this and GM did it with a weird motor in the corvette in the 90s, the LT5, there was no other variants of that motor.

But, the LT5 wasn't built or designed by GM, which was a good chunk of why support for that engine has been scarce.  Some service parts for the engine were simply never available. 

There's a story about how when GM execs saw the blueprints for the engine, they had a fit because the bore center was different from the small block Chevy.  The designers (Lotus?) said what does it matter, it's just a number, you're not building it so you're not using your tooling, there's no parts sharing, etc.  GM guys said no, must be 4.4".  So the designers gave in, shrank the bore center, which meant the pistons were smaller, and the valves were smaller...

The ZR1 was also roughly double the price of a base model Corvette.

engiekev
engiekev HalfDork
11/2/21 6:20 a.m.

The "original" LT5 really was a massive leap forward compared to any other GM engine at the time, Mercury (at the time) had the most sophisticated aluminum casting methods arguably in the entire automotive world.  The stillwater plant introduced assembly line use of CNC machining which was quite rare at the time, and SPC (statistical process control) using CMM data (way ahead of GM).

"Russ Gee, Director of Chevrolet Powertrain Engineering and Dick Donnelly, Chevrolet Engine Manufacturing Manager, quickly dismissed using a GM engine plant for several reasons. First, these plants were already struggling to meet demand. Second, the LT5 would be a low-volume project unsuited for high-volume facilities. Third, GM’s plants could not produce the engine’s complex aluminum castings. And finally, they were not capable of achieving the necessary level of quality."

https://www.corvette-mag.com/issues/109/articles/building-the-beast

Of course motorweek has some awesome retro footage from the plant!

 

engiekev
engiekev HalfDork
11/2/21 6:27 a.m.
STM317 said:
Opti said:

I believe when the engines leaked the zr1/Zora will also be the 5.5 with turbos. Don't know if it will be FPC but using the rest of it would be a good way to spread developmental costs out.

Definitely seems like the same basic architecture:

 

Combine that with the extra space in the nose of the C8 for an electric motor, and the space in the tunnel for a battery, and things could get pretty interesting.

 

But then again, GM recently killed a brand new, $16 million engine platform after putting it into a total of ~800 vehicles, sooooo......who knows.

The blackwing engine is a whole different animal and a total disaster at that.  Lots of outsourced design on that one and it shows.  Cadillac has always had tumultous branding and direction, whereas Corvette is much more grounded and conservative.

nderwater
nderwater UltimaDork
11/2/21 9:36 a.m.

The 2005 Ford GT quickly became a sought after collectors item. Do you think this car will do the same?

Adrian_Thompson (Forum Supporter)
Adrian_Thompson (Forum Supporter) MegaDork
11/2/21 9:51 a.m.

In reply to nderwater :

 

No because they made just over 4,000 Ford GT's with direct emotional hooks into the nostalgia of the original GT40 vs a hot rod version of a car they make more per month that GT's entire history, then they will usurpe it with another hotter mode in 12 months time  

 

Opti
Opti Dork
11/2/21 10:16 a.m.

In reply to Pete. (l33t FS) :

It worth noting GM did own lotus at the time.

I didnt know about service parts not being available for these. I looked extensively at picking one up a while back and although some things were more expensive than a normal C4, people were still able to get parts, and IIRC LPE was still servicing them and even building strokers for them until just recently.

tuna55
tuna55 MegaDork
11/2/21 11:09 a.m.

This begs the question, can you still buy the original LT5? I want one.

APEowner
APEowner GRM+ Memberand SuperDork
11/2/21 11:17 a.m.

It's not uncommon for OEM's to go outside for technical support, particularly with low volume products . Companies like AVL, Ricardo, Roush and Prodrive all provide engineering and sometimes manufacturing support.  

Pete. (l33t FS)
Pete. (l33t FS) MegaDork
11/2/21 6:51 p.m.

In reply to APEowner :

Indeed, it is not a monolithic block of Manufacturer.  There's a lot of subcontractin' going on.  There aren't five thousand automotive related companies in SE Michigan for no reason.

And yeah, it's nothing new, either.  Heck, Ford not only sent out Mustang shells to another company for chassis modification for the Boss 429, Kar Kraft stamped every car with their own internal serial number.

 

As far as LT5s are concerned, I understood that many/most internal engine gaskets were never available, so some people took the D move of protesting ZR1 autocrossers for "unauthorized internal engine modification".  Which the owner of the car would not be able to prove without disassembling the engine, which they wouldn't want to do because no gaskets, so the protest would be upheld and they'd lose their trophy.

I also used to follow the DIY-EFI mailing list and GMECM lists (hitches onion on belt) and the ZR1 ignition module setup looked very interesting and swappable, except you could not buy one.

Keith Tanner
Keith Tanner GRM+ Memberand MegaDork
11/3/21 8:43 p.m.

The Z06 is on display at SEMA. The jokes just write themselves...

Eric (Ottawa)
Eric (Ottawa) GRM+ Memberand Reader
11/4/21 6:32 a.m.

In reply to Keith Tanner :

Ha! Thanks for posting that pic, is the very essence of the corvette's aspirational demographic...

NickD
NickD MegaDork
11/4/21 9:46 a.m.

I guess I hadn't seen pics of the back of the C8 Z06 until the SEMA photos. That rear wing is yuck.

Kreb (Forum Supporter)
Kreb (Forum Supporter) GRM+ Memberand PowerDork
11/4/21 10:02 a.m.

In reply to Eric (Ottawa) :

That's kinda unfair. IMO the days of Corvettes as the steed of choice for the retired Viagra set has largely faded. I'd happily rock one and have neither a condo in Boca Raton, a much-younger girlfriend nor gold jewelry.   

STM317
STM317 UberDork
11/4/21 10:31 a.m.

In reply to Kreb (Forum Supporter) :

The people on those scooters probably can't even get into/out of the C8

Eric (Ottawa)
Eric (Ottawa) GRM+ Memberand Reader
11/4/21 11:08 a.m.

In reply to Kreb (Forum Supporter) :

Apologies, I'm not saying the Z06 isn't a great car but that at SEMA its the mobility scooters that belies the fact that many of them couldn't ingress/egress the car.

Also I'm not saying condos in sunny places and much-younger girl friends are bad things...

MotorsportsGordon
MotorsportsGordon Dork
11/4/21 9:37 p.m.

The pretty cool part of this new engine is that it's the most powerful normally aspirated v8 production ever produced. Previous any any na engine in a production car with this kind of power level was usually a v12. 
 

as for the original lt5 engine yes it was designed at lotus but they were chosen as gm owned them at the time. The main lotus tech guy was tony rudd. For those  who don't  know who he was he is a legendary formula one designer most famous for his years at brm. He was one of the very last few people who designed both the engine and chassis in f1. And and another interesting thing considering the new zo6 engine has a flat crank lotus later took the lt5 engine increased it to 6 litres and gave it a flat crank then put it on it lotus gt1 race car in 1997.

Kreb (Forum Supporter)
Kreb (Forum Supporter) GRM+ Memberand PowerDork
11/5/21 9:43 a.m.

In reply to NickD :

I have a friend (Milt Brown of Apollo Sports Cars) who's working on a subtle rebody to make it look more classic in a European way. Really looking forward to what he comes up with.

Kreb (Forum Supporter)
Kreb (Forum Supporter) GRM+ Memberand PowerDork
11/6/21 1:07 p.m.

In reply to MotorsportsGordon :

The whole idea that the engine is race proven and dialed in is very appealing. Such a rare thing nowadays.

dps214
dps214 Dork
11/6/21 2:55 p.m.
Kreb (Forum Supporter) said:

In reply to Eric (Ottawa) :

That's kinda unfair. IMO the days of Corvettes as the steed of choice for the retired Viagra set has largely faded. I'd happily rock one and have neither a condo in Boca Raton, a much-younger girlfriend nor gold jewelry.   

It's still the main demographic, just not the only one anymore.

Keith Tanner
Keith Tanner GRM+ Memberand MegaDork
11/6/21 3:16 p.m.
Kreb (Forum Supporter) said:

In reply to MotorsportsGordon :

The whole idea that the engine is race proven and dialed in is very appealing. Such a rare thing nowadays.

Is it actually race proven? I didn't think this was a competition engine. 

z31maniac
z31maniac MegaDork
11/6/21 3:52 p.m.
Keith Tanner said:
Kreb (Forum Supporter) said:

In reply to MotorsportsGordon :

The whole idea that the engine is race proven and dialed in is very appealing. Such a rare thing nowadays.

Is it actually race proven? I didn't think this was a competition engine. 

Same thought, aren't the cars in that series limited to like, 200hp less than this engine makes?

Kreb (Forum Supporter)
Kreb (Forum Supporter) GRM+ Memberand PowerDork
11/6/21 4:21 p.m.

Yeah, it's detuned, but still put through it's paces pretty rigorously.

MotorsportsGordon
MotorsportsGordon Dork
11/6/21 11:06 p.m.
Keith Tanner said:
Kreb (Forum Supporter) said:

In reply to MotorsportsGordon :

The whole idea that the engine is race proven and dialed in is very appealing. Such a rare thing nowadays.

Is it actually race proven? I didn't think this was a competition engine. 

They have been racing with the dohc flat crank v8 with the c8r. Just like the ls7 was derived from the c5r/c6r 7 lire race engine.

MotorsportsGordon
MotorsportsGordon Dork
11/6/21 11:07 p.m.
z31maniac said:
Keith Tanner said:
Kreb (Forum Supporter) said:

In reply to MotorsportsGordon :

The whole idea that the engine is race proven and dialed in is very appealing. Such a rare thing nowadays.

Is it actually race proven? I didn't think this was a competition engine. 

Same thought, aren't the cars in that series limited to like, 200hp less than this engine makes?

Yes mostly via air restrictions remove them and  they are far more powerful.

Keith Tanner
Keith Tanner GRM+ Memberand MegaDork
11/7/21 5:44 p.m.

I missed the fact that the C8.R race cars were using a variant of this. I'd love to have a good talk with the race engineers to hear what it's been like :)

The C8 was all over SEMA, by the way. It's got the booth presence of an Italian exotic but at a much more affordable price. I expected all the Broncos, I didn't expect all the Vettes.  Only the one Z06, of course.

Opti
Opti Dork
11/8/21 10:19 a.m.

In reply to Kreb (Forum Supporter) :

I would rather see street miles at this point. A race team has a whole different threshold for pain than joe shmo driving this thing on the street with an occasional autox or hpde. The usage is also completely different. Im hoping GM saw the failure of the voodoo and learned something but im still cautiously optimistic.

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