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Me too. I don't buy the Cadillac only public relations position. They're building it in the Corvette plant. That particular variant may be for the Caddy, but I believe there will be a DOHC TT Corvette motor.
Last edited by Steve Garrett; 08-31-2018 at 09:21 PM.
The "leaked" ME CAD drawings suggest a twin-turbo engine but with the turbos/exhaust ports conventionally located on the sides of the engine. So, yes the Caddy engine would be unique but certainly you would expect a lot of similarity in architecture and parts between both the Caddy and the Corvette engines. It would make no sense that both are independent clean-sheet designs.
The 'Hot V' is for thermal efficiency, not driver comfort.
Yes, but with a mid-rear setup you a have lots of real estate to the sites of the motors to hang traditional bottom/side turbos and efficient intercooler plumbing. Regardless the CAD leaks don't show a hot V. I do agree that the longblock will probably be the same.
Yes, but with a mid-rear setup you a have lots of real estate to the sites of the motors to hang traditional bottom/side turbos and efficient intercooler plumbing. Regardless the CAD leaks don't show a hot V. I do agree that the longblock will probably be the same.
The placement of the turbos in the HOT-V means the exhaust gasses travel the least distance and retain the most energy.
Thus the HOT-V is for thermal efficiency, and thermal efficiency is how one gets maximum power.
It is also more compact.
The Mid Engined car will have vertical space in the engine bay that the FE car does not.
So the HOT-V does not harm the "bay" layout. like it harms the FE bay layout.
certainly you would expect a lot of similarity in architecture and parts between both the Caddy and the Corvette engines. It would make no sense that both are independent clean-sheet designs.
Couldn't agree more.
To your point, take a look at Cadillac's CTS-V...
Every generation has had a Corvette engine, and the car was better for it.
Building a clean-sheet engine is a very expensive proposition.
In GM's current financial condition, it would be reckless for GM to do so just for the Corvette.
NO ONE here wants to see the company tottering on bankruptcy again.
Makes no sense to have a hot V with the engine behind you.
They will not. But the engine order data shows a 4.2TT for the c8. It will likely be the same engine without the hot v. The leaked CADs basically show this.
3 different zora power systems; na 6.2, 5.5 twin turbo and 5.5 twin turbo/electric combo. 4.2 is cadillac only, imo.
(edit)
if gm authority is correct and a 4.2 tt is available in the zora, i stand corrected.
it would make sense to replace the 6.2 with a similar hp dohc. i'm surprised that they would offer both at the same time, but it might be that by using the 6.2 it would allow them to introduce the car with the lowest possible msrp.
For Cadillac to be GM top luxury division and to keep commanding a high MSRP, it makes sense to have its own engine....assuming the cost of that engine remains manageable and they can sell enough of them. I am sure some buyers will strongly consider buying a Cadillac with that engine that no other GM division has. Cadillac should compete with the best of the European brands and having its own 4.2 TT engine will help.
That being said, it makes sense to me that the ME should have available a 3.5 or 4.0 TT engine if it helps reduce curb weight. My daily driver is the ATS-V with the 3.6TT and 6-speed manual transmission. Its a great engine and its almost as fast as my C7. That engine has a lot of new technology we can't ignore.
For Cadillac to be GM top luxury division and to keep commanding a high MSRP, it makes sense to have its own engine....assuming the cost of that engine remains manageable and they can sell enough of them. I am sure some buyers will strongly consider buying a Cadillac with that engine that no other GM division has. Cadillac should compete with the best of the European brands and having its own 4.2 TT engine will help.
That being said, it makes sense to me that the ME should have available a 3.5 or 4.0 TT engine if it helps reduce curb weight. My daily driver is the ATS-V with the 3.6TT and 6-speed manual transmission. Its a great engine and its almost as fast as my C7. That engine has a lot of new technology we can't ignore.
I wonder if we will see a 6.2 update LT1 in the base coupe model at release but see a DOHC 5.5 in the Spyder version.
I am thinking that the Spyder will be 10 to 15k premium over the coupe.
With the 5.5 DOHC it makes that premium that much easier to justify and let's the base coupe hold down cost by using the LT1.
Plus if the C8R will not be running the the same 5.5 now used in the C7R it would make sense that they introduced a 5.5 DOHC for use in Imsa.
I have no inside info just think that way we have an inexpensive 70k coupe and a 85 k Spyder with new engine design for the intro of the C8.
The placement of the turbos in the HOT-V means the exhaust gasses travel the least distance and retain the most energy.
Thus the HOT-V is for thermal efficiency, and thermal efficiency is how one gets maximum power.
It is also more compact.
The Mid Engined car will have vertical space in the engine bay that the FE car does not.
So the HOT-V does not harm the "bay" layout. like it harms the FE bay layout.
Sorry, but I'm buying this. I don't see any difference in distance, and any thermal loss due to distance can be more than made up with more efficient exhaust manifold/header designs. Just look at race engines.
The son in law worked at the Corvette Plant a while back and said he saw a machine that said left and right turbo. But not sure if it was Corvette or Caddy.
6.2L 5th gen LT V8
4.6L 6th gen LT V8 W/ DOHC and twin turbos
5.4L 6th gen LT V8 W/ DOHC and twin turbos
4.6L or 5.4L LT V8 W/ DOHC, no forced induction to replace the 6.2L engine down the line.
A hybrid powertrain is just a rumor until proven otherwise. I don’t believe in all of the flat plane crank nonsense either. One big publication starts the rumor and eventually the whole internet goes with it... but most people aren’t aware of ZERV, of course. Why would he show us those pictures only to lie about other information regarding the same project?
Why so many engine options ? That doesn't fit recent history and economics. I think they will offer an LT2 6.2L OHV engine, and a 4.2L OR a 5.5L DOHC engine, with and without turbos. A 4.2 L DOHC engine will not make 500 HP without boost, but a 5.5L probably will. Hence I think the 5.5L will, eventually, replace the small block cam-in-block V-8. But not next year !
Why so many engine options ? That doesn't fit recent history and economics. I think they will offer an LT2 6.2L OHV engine, and a 4.2L OR a 5.5L DOHC engine, with and without turbos. A 4.2 L DOHC engine will not make 500 HP without boost, but a 5.5L probably will. Hence I think the 5.5L will, eventually, replace the small block cam-in-block V-8. But not next year !
C7 Corvette
6.2 V8 (Base)
6.2 V8 with 1.7L Eaton SC (Z06)
6.2 V8 with 2.6L Eaton SC (ZR1)
Why so many engine options ? That doesn't fit recent history and economics. I think they will offer an LT2 6.2L OHV engine, and a 4.2L OR a 5.5L DOHC engine, with and without turbos. A 4.2 L DOHC engine will not make 500 HP without boost, but a 5.5L probably will. Hence I think the 5.5L will, eventually, replace the small block cam-in-block V-8. But not next year !
I believe that Porsche has proven you wrong. The 2018 911 GT3 has a 4L N/A flat 6 cylinder with 500 horsepower. Designed for the street and meets all emission regulations, etc.
Even with it's relatively low torque , it hits 0-60 in 3.2 seconds. with the PDK(DCT).
No "HOT V" going in the C8. Doesn't make any sense and the thermal efficiency issue is easily resolved even with turbos mounted off to the side from a normal intake/exhaust design. The Mid-Engine bay actually gives the solution the HOT V was desgined to correct, as the turbos can now easily be right off the exhaust manifolds on both sides of the engine. Intake charge still has to travel the intercooler route, which could arguably be shorted in a non-HOT-V motor. It also gives GM the ability to present a very nice engine look in the rear bay, since they seem to be so fond of windows and holes to show of the top model engines lately............
No Hot-V for Vette
Last edited by WhiteDiamond; 09-02-2018 at 01:07 AM.
08-30-2018, 10:09 AM
C8 engine and specs hiding in plain sight
