Cadillac Engine for the C8?

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11-21-2018, 06:36 PM

#21

NY09C6

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Quote:

Originally Posted by NemesisC5

DOHC engines by design exhibit improved control of valve events at any RPM (improved efficiencies of power and fuel mileage) especially high RPM's where hydraulic lifters are unable to maintain precise control of valve events due to "float". DOHC is more efficient than OHV and that's why the change is taking place.

I fully agree the shift to smaller displacement dohc engines is to meet tougher gov mandated fuel efficiency standards. Unfortunately we pay extra for this with no real benefit except a minuscule savings on fuel.

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11-21-2018, 06:38 PM

#22

NY09C6

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Quote:

Originally Posted by NemesisC5

however I don't expect 5.5 litre, I think that number get tossed around often because it's been used in the racing program for years. We'll all have to wait and see.

The 5.5 is thrown around because it was in the documented engine order data leak a while back. They listed three engines. A NA 6.2, a TT4.2 and a TT5.5.

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11-21-2018, 06:50 PM

#23

JerriVette

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Real world the 6.2 liter ohv engine is more fuel efficient than dohc engines except possibly on epa government tests...

waste of money and time ..

the twin turbo dohc hot vee should go to 3.9 liters with a flat plane crank..

that would set the exotic car world on fire ...ie ferrari..

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11-21-2018, 07:12 PM

#24

NY09C6

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Quote:

Originally Posted by JerriVette

Real world the 6.2 liter ohv engine is more fuel efficient than dohc engines

It certainly should be. Less loss with half the valve springs and chains. But manufactures are doing DOHC to drop cubic inches. It is possible for a high reving 5.5 DOHC to compete with 6.2 OHV and get better gas mileage while doing so. Unfortunately the to loss of low end torque will take away from the driving experience on the street.

Last edited by NY09C6; 11-21-2018 at 07:13 PM.

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11-26-2018, 11:51 AM

#25

JHrinsin

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GM just announced that the Hamtramck plant (which builds the Cadillac CT6) will close in 2019. Not sure the 2019 CT6 Sport will ever get built (at least in the USA) with the Blackwing twin turbo V8. So the C8 may in fact be the only and/or the true home for this engine.

Last edited by JHrinsin; 11-26-2018 at 11:53 AM.

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11-26-2018, 12:00 PM

#26

Tom73

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Quote:

Originally Posted by NY09C6

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11-26-2018, 12:25 PM

#27

rmorin1249

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St. Jude Donor '15-'16,'18

Sure hope the C8 is a success. If not, result could be very sad for the BG plant. With all the money GM sank into this plant surely it will stay open.

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11-26-2018, 12:46 PM

#28

norge1956

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Quote:

Originally Posted by JHrinsin

Looks like the Blackwing engine is headed to the Corvette with the CT6 cancelled ! I wouldnt be surprised that they have been testing the Corvette motor in the CT6 and no one would have gave it a second look..

https://www.chevyhardcore.com/tech-s...win-turbo-v-8/

Last edited by norge1956; 11-26-2018 at 12:49 PM.

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11-26-2018, 01:19 PM

#29

Parcival

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Quote:

Originally Posted by JHrinsin

It certainly looks intriguing for the BW to go to the C8. It was tuned to 500 and 550hp for the CT6 and to be "refined" for the Caddy so it may be tuned and fit differently for the C8 ME. It'll be fun to see how this plays out.

Btw, they already take builds for the '19 CT6 with the 3L TT V6 engine. So, I guess it'd be the '20 gone.

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11-26-2018, 01:37 PM

#30

PCMIII

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I doubt that Zora will have a small block Chevy engine. The Blackwing makes way more sense from a performance and marketing standpoint, especially when combined with a Getrag DCT.

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11-26-2018, 01:45 PM

#31

jimmyb

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Quote:

Originally Posted by norge1956

Is the CT6 cancelled or just moving to another plant?

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11-26-2018, 01:50 PM

#32

PCMIII

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Quote:

Originally Posted by jimmyb

Is the CT6 cancelled or just moving to another plant?

Production will continue in China. Dead here.

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11-26-2018, 02:54 PM

#33

norge1956

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I would not be surprised if the Blackwing logo is the new C8 Corvette logo

Last edited by norge1956; 11-26-2018 at 04:34 PM.

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11-26-2018, 02:55 PM

#34

JHrinsin

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Quote:

Originally Posted by JHrinsin

Maybe not so fast for the Blackwing not making it into the CT6. But after June1st 2019, there is no official home for the new engine.

https://www.automobilemag.com/news/g...uick-lacrosse/

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11-26-2018, 02:57 PM

#35

PCMIII

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Quote:

Originally Posted by JHrinsin

Maybe not so fast for the Blackwing not making it into the CT6. But after June1st 2019, there is no official home for the new engine.

https://www.automobilemag.com/news/g...uick-lacrosse/

The Blackwing's home is BGA where it will be installed in the Zora, Stingray and possible new Cadillac sports car.

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11-26-2018, 03:29 PM

#36

rlhmarines

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Quote:

Originally Posted by jimmyb

Is the CT6 cancelled or just moving to another plant?

I believe it will move to Lansing along with the Alpha replacement cars after 2019.

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11-26-2018, 03:33 PM

#37

sstonebreaker

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Quote:

Originally Posted by Tom73

Problem with a DOHC engine is that they are by nature a high reving engine. To get them to perform you have to ring their necks. Higher rpms means shorter engine life. Personally I prefer an engine that can loaf through life and last as long as the car.

Where do you get that? DOHC engines are better performing all around than an equivalently sized OHV engine because they have inherently superior airflow. You line up identical displacement engines with identical cam specs, and the DOHC engine will whip the OHV engine every time, from 0 to redline. What makes the OHV engine superior is light weight and simple design. A mustang 5.0 liter dohc engine weighs about the same as an old school big block. Plus the weight is high on the engine. Each head on the LS engines weighs 22 lbs fully dressed. Each head of the ford coyote engine weighs 66 lbs, and that doesn't include an additional 30 lbs for the two cams. The dohc engine makes up for that with superior airflow and the ability to vary intake and exhaust timing independently.