moparfan

AWD

A twin turbo hot-side, Cadillac Exclusive engine. Comes in the two different horsepower versions, although it seems like there isn't a great spread between the two. It's paired to the 10spd auto, so turbo lag/dropoff between shifts should be minimal, if any.

Forged aluminum rods? (another article from Autoweek said forged steel con rods, so I don't know)

http://autoweek.com/article/technolo...lac-has-new-v8


How do they manage the heat from such a configuration - yes, I'm ignorant.

Some specs:
4.2-liter preliminary specs:

• Block: 90-degree V with five cross-bolted main bearing caps; sand-cast aluminum with pressed-in iron cylinder liners
• Bore/stroke: 3.39 in. x 3.35 in./86 mm x 90.2 mm
• Crankshaft: Forged steel
• Pistons: High-strength hypereutectic aluminum with friction-reducing polymer skirt coating
• Rods: Forged aluminum with floating wrist pins
• Compression ratio: 9.8:1
• Turbochargers: Two low-inertia twin scroll with electronically controlled wastegates and water-to-air intercooling

http://www.autonews.com/article/2018...sive-engine-v8


GMauthority has some more drivetrain details, although I think the wording is somewhat vague or proofing needed?

http://gmauthority.com/blog/2018/03/...hiseled-looks/

moparfan

Engines hand-built in Bowling Green.

https://www.autoblog.com/2018/03/21/...c-ct6-v-sport/

Tuxevo

iTrader: (8)

Didn't they have a massacre there?

six40

Glad to see GM is finally stepping into more modern times. Can't wait to see how this engine holds up.

barneyb

Or how it blows up!

OX

iTrader: (1)

Love this quote from R & T "The turbos will be running 20 lbs of boost apiece, shoving air into cylinders with a 9.8:1 compression ratio"
Uuuuh??, so 40 pounds of boost, LOL!!!!!!!!!!!!!!!!

LetsGetThisDone

iTrader: (1)

20psi is 20psi...lol. Doesn't matter how many turbo's there are. Silly journalists.

badev0

iTrader: (74)

That torque number looks nice.

OX

iTrader: (1)

The more I thought about it, maybe they phrased it that way since the turbos are in the "V" of the engine.
If there are two totally separate intake tracts (including into each head with two separate throttle bodies),
then maybe it's not as bad as I first thought.

LetsGetThisDone

iTrader: (1)

I would guess it would still be mostly the same if both turbo's fed one intake manifold. Its the same amount of air going into the same amount of engine

OX

iTrader: (1)

Yes, was trying to be nice and give an out for the R & T journalist. Most likely, they
didn't even know that what they wrote sounds weird LOL!!!

barneyb

Ford pickups are like this, two tiny turbos.

LetsGetThisDone

iTrader: (1)

They're not in the valley though.

OX

iTrader: (1)

Not twin throttle body either.

moparfan

How long do the modern, (highest quality - I assume in this case) oem gas-engine turbos last?