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#4701749 - 03/21/18 10:45 AM New 4.2L V8 from GM and Cadillac
MrHorspwer Offline


Registered: 12/18/06
Posts: 1428
Loc: Michigan
GM/Cadillac announced today a new 4.2L twin-turbo V8 for the CT6.

Clean-sheet design that shares nothing with any existing GM engines
Hot-V design, with the exhaust ports exiting into the valley of the engine, directly where the turbos are located
Cylinder deactivation
Hand-built and signed by the builder at the Bowling Green Corvette Plant

550 HP/627 lb. ft. for the CT6 V-Sport.

The non V-Sport version will also have the engine available, though with *only* 500 HP.

The V-Sport is also getting an insane 19" Brembo brake package.


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#4701759 - 03/21/18 10:54 AM Re: New 4.2L V8 from GM and Cadillac [Re: MrHorspwer]
oil_film_movies Offline


Registered: 06/13/16
Posts: 2634
Loc: MN
The LT4 produces 650HP/650FT-LBS with supercharging.
I think Cadillac marketers want to go elite, up-scale, Cadillac-unique to sell their cars on emotion. Might work if they can get a high price.
Even though the LT4 is better. Mass may be similar too.

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#4701767 - 03/21/18 11:05 AM Re: New 4.2L V8 from GM and Cadillac [Re: oil_film_movies]
michaelluscher Offline


Registered: 10/07/12
Posts: 2439
Loc: Staten Island, NY
Originally Posted By: oil_film_movies
The LT4 produces 650HP/650FT-LBS with supercharging.
I think Cadillac marketers want to go elite, up-scale, Cadillac-unique to sell their cars on emotion. Might work if they can get a high price.
Even though the LT4 is better. Mass may be similar too.


This line of thinking brings back bad memories

This same line of thinking birthed the Northstar
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#4701773 - 03/21/18 11:08 AM Re: New 4.2L V8 from GM and Cadillac [Re: MrHorspwer]
BAJA_05 Online   content


Registered: 02/04/18
Posts: 387
Loc: Berks County/Pa.
Was behind a new or newer Cadillac yesterday. It had a 2.0L Turbo emblem on the back. Sorry not talking about what the OP stated though.
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#4701787 - 03/21/18 11:19 AM Re: New 4.2L V8 from GM and Cadillac [Re: MrHorspwer]
oil_film_movies Offline


Registered: 06/13/16
Posts: 2634
Loc: MN
"Cadillac says the new 4.2 is actually a little lighter and a little more compact than the LT4. We find this hard to believe, considering compact dimensions are among the biggest selling points of GM’s small-block. Engineers point to the shorter block (by 50 millimeters), made possible by bore spacing down to 96.0 mm from 111.7 mm in the small-block."-- Car and Driver magazine

So they saved some mass. Doesn't sound like much.
We have to think of this as appealing to the kind of rich buyer that responds to "gee-whiz, twin turbo's!!". GM might make money on this one, so I guess there's no sense in saying the LT4 is better and what idiots GM are for producing this newer design that doesn't beat an LT4.
Maybe this beats an LT4 for NVH. That would be a justification for it I guess. The LT4 is pretty good there now, so I dunno if this a leap forward.

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#4701788 - 03/21/18 11:20 AM Re: New 4.2L V8 from GM and Cadillac [Re: MrHorspwer]
ARCOgraphite Offline


Registered: 05/17/09
Posts: 12037
Loc: N.H, U.S.A.
Sounds like a mid engine vette is near.
That is not a Caddy only engine unless GM corporate is moronic.
Oh, maybe they are moronic!
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#4701847 - 03/21/18 11:53 AM Re: New 4.2L V8 from GM and Cadillac [Re: MrHorspwer]
BrocLuno Offline


Registered: 09/06/15
Posts: 5621
Loc: Kalifornia Kollective
Sorry - Barra is not moronic. She may be able to lead them to better profitability.

I'm sure the Caddy buyers have been polled (no pun intended). Branding needs an edge smile


Edited by BrocLuno (03/21/18 11:54 AM)
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#4701875 - 03/21/18 12:11 PM Re: New 4.2L V8 from GM and Cadillac [Re: MrHorspwer]
oil_film_movies Offline


Registered: 06/13/16
Posts: 2634
Loc: MN
Luxury-performance-high$$$ cars need to have 4-valve cylinders and twin turbos. Its a selling point.
Never mind that the LT4 performs better. Doesn't matter except to engineers like me who like the best, optimal way to achieve performance.

BMW, Mercedes, Lexus, Infiniti, Jaguar, Alfa Romeo, Audi are the competitors, and all their engines are more complicated than a million Swiss watches.
It gives the owner bragging rights and an inflated sense of self-worth the more complex a machine they can own.

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#4701915 - 03/21/18 12:44 PM Re: New 4.2L V8 from GM and Cadillac [Re: MrHorspwer]
SubieRubyRoo Offline


Registered: 05/14/12
Posts: 1232
Loc: Winchester, Indiana
I'd take two of today's available turbos over any supercharger. You simply can't match the power and torque available from twin turbos with a streetable supercharger.

Just look at all the German cars... 4.0L TT making well over 600HP, 0-60 in the low 3s, and 25+ mpg on the highway. If I could sell some of my offspring, the M5 would be the next thing in my driveway.

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#4701917 - 03/21/18 12:45 PM Re: New 4.2L V8 from GM and Cadillac [Re: ARCOgraphite]
4WD Online   confused


Registered: 09/21/10
Posts: 6545
Loc: Texas
Who was it on the soap box wrt DOHC engines (multi valve)

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#4701960 - 03/21/18 01:24 PM Re: New 4.2L V8 from GM and Cadillac [Re: michaelluscher]
nthach Offline


Registered: 01/02/04
Posts: 3992
Loc: California
Originally Posted By: michaelluscher


This same line of thinking birthed the Northstar

This time around, GM is run by an engineer(Mary Barra) and not the train wrecks before the government takeover. I think GM did learn quite a bit from the Northstar and applied what/what not to do for this motor.

The hot-V design is probably a first outside of diesel V8s - GM probably made that move to maximize thermodynamic efficiencies with the turbocharger setup. If the engine is DOHC and headed into the Corvette or another GM product, having a smaller space claim helps as well.

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#4702045 - 03/21/18 02:48 PM Re: New 4.2L V8 from GM and Cadillac [Re: nthach]
LEADED Offline


Registered: 07/13/11
Posts: 98
Loc: MICHIGAN USA
Is this Powerplant DOD ? . Will see if anyone have info . Thanks

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#4702057 - 03/21/18 02:57 PM Re: New 4.2L V8 from GM and Cadillac [Re: LEADED]
SubieRubyRoo Offline


Registered: 05/14/12
Posts: 1232
Loc: Winchester, Indiana
Originally Posted By: LEADED
Is this Powerplant DOD ? . Will see if anyone have info . Thanks


The engine also will be General Motors’ first to apply Active Fuel Management cylinder shutoff to an overhead cam engine. Preliminary numbers are 550 hp @ 5,700 rpm in high-output form, and 500 hp @ 5,000 to 5,200 in “standard” form.

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#4702068 - 03/21/18 03:05 PM Re: New 4.2L V8 from GM and Cadillac [Re: ARCOgraphite]
CT8 Offline


Registered: 10/09/14
Posts: 11230
Loc: Idaho
Originally Posted By: ARCOgraphite
Sounds like a mid engine vette is near.
That is not a Caddy only engine unless GM corporate is moronic.
Oh, maybe they are moronic!

The mid engine Vette has been near since the the early 1960's
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#4702078 - 03/21/18 03:13 PM Re: New 4.2L V8 from GM and Cadillac [Re: CT8]
4WD Online   confused


Registered: 09/21/10
Posts: 6545
Loc: Texas
Got pretty good distribution with the transaxle and torque tube … pushrod engines have a low CG … they did good adding a huffer & puffer (and blow your doors off)

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