C8 Mid-Engine Motor

[Ccmano]

I’d be willing to bet that the motor for the mid-engine C8 is a derivative of this new Cadillac twin cam V8.
H

http://autoweek.com/article/technology/northstar-20-cadillac-has-new-v8?utm_source=&utm_medium=enewsletter&utm_term=headline-center&utm_content=body&utm_campaign=

[conesare2seconds]

Seems like a good bet. The General will need to put that engine in more than one platform to justify the development costs.

[DRM500RUBYZR-1]

I’d be willing to bet that the motor for the mid-engine C8 is a derivative of this new Cadillac twin cam V8.
H

http://autoweek.com/article/technology/northstar-20-cadillac-has-new-v8?utm_source=&utm_medium=enewsletter&utm_term=headline-center&utm_content=body&utm_campaign=



That will make it special. (not)


Prepare for a ZR-1 C-4 Deja vu' all over again.


Maybe they can put the Vette rear lights and bumper on the Caddy...............


The whole idea of a Halo car is you leave the Halo on the ONE Car!


Marty

[Ccmano]

That will make it special. (not)


Prepare for a ZR-1 C-4 Deja vu' all over again.


Maybe they can put the Vette rear lights and bumper on the Caddy...............


The whole idea of a Halo car is you leave the Halo on the ONE Car!


Marty

True, but at least it’s not like the Ford GT with the 3.5 V6 Ecoboost. It may make
647hp but versions are used in just about everything they make including the F150. Just tacky.:thumbsdo:
H

[XfireZ51]

That will make it special. (not)


Prepare for a ZR-1 C-4 Deja vu' all over again.


Maybe they can put the Vette rear lights and bumper on the Caddy...............


The whole idea of a Halo car is you leave the Halo on the ONE Car!


Marty


Sorry Marty but I think the 4.2 TT DOHC motor will be a lot more special than a
OHV in block cam’d truck motor like the LT1 or its supercharged version LT4.
It looks like its using some pretty neat technology worthy of being included as part of the evolution for America’s Sports Car.

[ghlkal]

Up top, more aluminum-alloy was used for the heads. Cadillac employed a “hot-V” setup, meaning the exhaust exits the cylinders in the valley of the V, and fresh air and fuel come outside of it. This allows for both the turbochargers and catalytic converters to lie in the V as well, aiding in quick warmup to operating temperature. Fuel injection is direct into the cylinder, spraying at 5,076 psi of pressure. Unlike your Chevy, this is a dual overhead cam engine with four valves per cylinder and fancy valve timing.

Yup, good engine. The hot-V is the wave of the future IMHO. Mercedes has done some amazing things with their hot-V engines.

[XfireZ51]

Altho I believe the Corvette version will not be a hot V. The CAD drawings for the C8 that were exposed by ZERV on the Corvette Forum show exhaust tubing that was more conventional. More room in a mid engine to route exhaust outboard of the motor.

[Z51JEFF]

In the past I’ve read that in order to get the approval for the C8 GM had to share the ME platform with Cadillac to offset to developmental cost so don’t be surprised if that ME camo car at the fast food drive through is in fact the Cadillac.

[fred]

For anyone like me who is not familiar with the concept...
https://www.carthrottle.com/post/what-is-a-hot-v-turbo-engine-layout-and-what-benefits-does-it-have/

[efnfast]

Ford's 6.7L turbo diesel is a hot V set up.

[Paul Workman]

Ford's 6.7L turbo diesel is a hot V set up.

I guess I could "Google it", but what is a "HOT V":icon_scra

[Z51JEFF]

I sure hopes that’s not the motor going in the car,can’t GM make an attractive motor anymore? Even the base LT1s in the 96 Corvette was simple,nice to look at.

[efnfast]

I guess I could "Google it", but what is a "HOT V"? Just a popular term for supercharged??:icon_scra
Hot V: Hot valley, the exhaust exits in the valley as opposed to the intake in the valley. The engine breaths backwards.

[RussMcB]

I guess I could "Google it", but what is a "HOT V"? Just a popular term for supercharged??:icon_scraIt's probably worth googling. I didn't know what it meant, and found a few good explanations and advantages.

[Ccmano]

Geez guys are you not reading the posts in this thread? #10 has a link that explains what “hot V” is and it’s history.:icon_scra
H
:cheers:

[-=Jeff=-]

For anyone like me who is not familiar with the concept...
https://www.carthrottle.com/post/what-is-a-hot-v-turbo-engine-layout-and-what-benefits-does-it-have/

Here is the post ccmano is referring to.

[jss06c6]

Lots of innovation there. When I look at this package, I start to have maintenance heartburn. Beginning to look like Ferrari packaging and would require the engine to be pulled for anything beyond oil and air filter changes. The Mercury Marine crate engine looks much easier to "work on".

Sent from my QTAIR7 using ZR-1 Net Registry mobile app (http://r.tapatalk.com/byo?rid=90383)

[Hog]

Lots of innovation there. When I look at this package, I start to have maintenance heartburn. Beginning to look like Ferrari packaging and would require the engine to be pulled for anything beyond oil and air filter changes. The Mercury Marine crate engine looks much easier to "work on".

Sent from my QTAIR7 using ZR-1 Net Registry mobile app (http://r.tapatalk.com/byo?rid=90383)
Except for the almost $100,000 price tag for the 1500hp versions. They do make some awesome engines though, and drives(marine).


See the exhaust exits on the 4.2 DOHC TT, perfect for both front engine and mid engine applications.

[XfireZ51]

Lots of innovation there. When I look at this package, I start to have maintenance heartburn. Beginning to look like Ferrari packaging and would require the engine to be pulled for anything beyond oil and air filter changes. The Mercury Marine crate engine looks much easier to "work on".

Sent from my QTAIR7 using ZR-1 Net Registry mobile app (http://r.tapatalk.com/byo?rid=90383)

As an owner of the C4 ZR-1, I have to tell u however that u basically pull that motor whenever anything needs work beyond just plenum and ignition/injectors.
Any DOHC motor really needs ease of access for cam install/timing and cylinder head work. But u already know that 🤗
That SBC 4 is awesome because of the LS7 bottom end and the belt drive cam system. Not to mention its nit any taller than an LS motor. 750hp NA. Wow!

[jss06c6]

Big fan of the Merc SB 4!

Sent from my XT1585 using ZR-1 Net Registry mobile app (http://r.tapatalk.com/byo?rid=90383)

[Ccmano]

Officially they claim the Cadillac motor won’t power the Mid-Engine.

http://www.thedrive.com/news/19742/cadillacs-turbo-4-2-liter-v-8-wont-power-the-corvette-report-says

I still think that’s just corporate speak. A different version of this motor will. Highly unlikely GM will develop two similar but separate motors of this type at the same time.
H
:cheers:

[XfireZ51]

Well so it seems Cadillac is tacitly acknowledging the existence of an ME Corvette platform.

[WARP TEN]

BMW has had a Hot V setup since 2008--ten years. Seems to work OK. --Bob

[XfireZ51]

Officially they claim the Cadillac motor won’t power the Mid-Engine.

http://www.thedrive.com/news/19742/cadillacs-turbo-4-2-liter-v-8-wont-power-the-corvette-report-says

I still think that’s just corporate speak. A different version of this motor will. Highly unlikely GM will develop two similar but separate motors of this type at the same time.
H
:cheers:


Hans,

I think the Corvette version of this motor will not feature a Hot V config. For packaging purposes, it doesn't need to be. Any pics of the camo'd ME, show the exhaust tips on the outside corners of the rear nd and not exiting the middle of the car as they do now. This is also confirmed from the "unofficial" CAD drawing that have been posted on CF. Look at where the exhaust headers are placed.

[conesare2seconds]

Hope GM conquers some of the issues BMW encountered with their hot-v setup. There is a good write up at the eEuroparts blog which sheds light on the fire-sale pricing of some of their recent models on the used market.

https://www.eeuroparts.com/blog/9654/bmw-n63-hot-vee-hot-garbage/

[Hog]

Hans,

I think the Corvette version of this motor will not feature a Hot V config. For packaging purposes, it doesn't need to be. Any pics of the camo'd ME, show the exhaust tips on the outside corners of the rear nd and not exiting the middle of the car as they do now. This is also confirmed from the "unofficial" CAD drawing that have been posted on CF. Look at where the exhaust headers are placed.
The exhaust on the Caddy 4.2 TT DOHC engine exits on either side of the engine, similar to where a conventional V8 exhaust exits.


Passenger side
http://cdn.enginelabs.com/image/2018/03/cadillac-drops-details-on-all-new-4-2-liter-twin-turbo-v8-engine-2018-03-21_20-01-11_284540-768x505.jpg


http://www.corvetteblogger.com/images/content/2018/032318_1b.jpg
Drivers side

[Hog]

Officially they claim the Cadillac motor won’t power the Mid-Engine.

http://www.thedrive.com/news/19742/cadillacs-turbo-4-2-liter-v-8-wont-power-the-corvette-report-says

I still think that’s just corporate speak. A different version of this motor will. Highly unlikely GM will develop two similar but separate motors of this type at the same time.
H
:cheers:
I agree, Cadillac and Chev have history sharing engines. LS6 in the CTS-V and 01-04 Z C5 ZO6.
556hp LSA in the 2nd GEN CTS-V and the 580hp LSA in the Camaro ZL1 along with the 09-13 638hp LS9, all blown 6.2 liter GEN 4 SBCs, though I will admit though they all share the same basic architecture, the LS9 does have some prominent "goodies" separating it from the LSA.


Maybe the 550hp Cadillac 4.2liter/256cid TT DOHC engine isn't outputting enough for the new C8 Mid Engine Vette. It wasn't long ago when the 5.5/336cid liter version of the GEN 5 SBC wasn't approved for the new 2014 C7 due to insufficient low rpm torque for a car of Corvette caliber when in V-4 mode, hence the 6.2/376cid displacement was retained.




Though the CT6 V-Sport which is where the 4.2 TT DOHC engine will reside, is no small car, and being a Cadillac wont be a lightweight either. Though it's 10 speed automatic could help offset any low rpm torque insufficiencies.




I wonder if/when the Cadillac XLR program might be restarted at Bowling Green?
The new 2019 4.2 liter TT DOHC will be made at Bowling Green, so they wouldn't have to ship engines far.

[XfireZ51]

The CAD drawings of the ME show headers that remain outside of the motor unlike the manifolds on the Caddy which appear to route exhaust to the V valley of the motor for the turbos. Whether that’s the final config, we’ll need to wait and see.