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New 4.2L V8 from GM and Cadillac #4701749
03/21/18 10:45 AM
03/21/18 10:45 AM
Joined: Dec 2006
Posts: 1,498
Michigan
MrHorspwer Offline OP
MrHorspwer  Offline OP

Joined: Dec 2006
Posts: 1,498
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.


Re: New 4.2L V8 from GM and Cadillac [Re: MrHorspwer] #4701759
03/21/18 10:54 AM
03/21/18 10:54 AM
Joined: Jun 2016
Posts: 4,011
MN
oil_film_movies Offline
oil_film_movies  Offline

Joined: Jun 2016
Posts: 4,011
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.

Re: New 4.2L V8 from GM and Cadillac [Re: oil_film_movies] #4701767
03/21/18 11:05 AM
03/21/18 11:05 AM
Joined: Oct 2012
Posts: 2,495
Staten Island, NY
michaelluscher Offline
michaelluscher  Offline

Joined: Oct 2012
Posts: 2,495
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


'06 Toyota Camry SE V6 3MZ-FE 100k
'01 Mercury Villager Estate VG33E 52k
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Re: New 4.2L V8 from GM and Cadillac [Re: MrHorspwer] #4701773
03/21/18 11:08 AM
03/21/18 11:08 AM
Joined: Feb 2018
Posts: 510
Chester County/Pa.
BAJA_05 Offline
BAJA_05  Offline

Joined: Feb 2018
Posts: 510
Chester 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.


2017 VW Jetta SE TSI 1.4L Turbo (hers)
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Re: New 4.2L V8 from GM and Cadillac [Re: MrHorspwer] #4701787
03/21/18 11:19 AM
03/21/18 11:19 AM
Joined: Jun 2016
Posts: 4,011
MN
oil_film_movies Offline
oil_film_movies  Offline

Joined: Jun 2016
Posts: 4,011
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.

Re: New 4.2L V8 from GM and Cadillac [Re: MrHorspwer] #4701788
03/21/18 11:20 AM
03/21/18 11:20 AM
Joined: May 2009
Posts: 12,484
N.H, U.S.A.
ARCOgraphite Offline
ARCOgraphite  Offline

Joined: May 2009
Posts: 12,484
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!


2019 VW Jetta S,6M OCI#0 2103mi-Castrol Edge Prof? VW508+OE Filter; '17 Subaru Crosstrek CVT OC#6 43467mi-Valvoline Adv 0w20 + SOA Filter
Re: New 4.2L V8 from GM and Cadillac [Re: MrHorspwer] #4701847
03/21/18 11:53 AM
03/21/18 11:53 AM
Joined: Sep 2015
Posts: 6,177
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline

Joined: Sep 2015
Posts: 6,177
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

Last edited by BrocLuno; 03/21/18 11:54 AM.

Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: New 4.2L V8 from GM and Cadillac [Re: MrHorspwer] #4701875
03/21/18 12:11 PM
03/21/18 12:11 PM
Joined: Jun 2016
Posts: 4,011
MN
oil_film_movies Offline
oil_film_movies  Offline

Joined: Jun 2016
Posts: 4,011
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.

Re: New 4.2L V8 from GM and Cadillac [Re: MrHorspwer] #4701915
03/21/18 12:44 PM
03/21/18 12:44 PM
Joined: May 2012
Posts: 2,463
The land of USA-made Subies!
SubieRubyRoo Offline
SubieRubyRoo  Offline

Joined: May 2012
Posts: 2,463
The land of USA-made Subies!
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.

Re: New 4.2L V8 from GM and Cadillac [Re: ARCOgraphite] #4701917
03/21/18 12:45 PM
03/21/18 12:45 PM
Joined: Sep 2010
Posts: 8,221
Texas
4WD Offline
4WD  Offline

Joined: Sep 2010
Posts: 8,221
Texas
Who was it on the soap box wrt DOHC engines (multi valve)

Re: New 4.2L V8 from GM and Cadillac [Re: michaelluscher] #4701960
03/21/18 01:24 PM
03/21/18 01:24 PM
Joined: Jan 2004
Posts: 5,007
California
nthach Offline
nthach  Offline

Joined: Jan 2004
Posts: 5,007
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.

Re: New 4.2L V8 from GM and Cadillac [Re: nthach] #4702045
03/21/18 02:48 PM
03/21/18 02:48 PM
Joined: Jul 2011
Posts: 114
MICHIGAN USA
LEADED Offline
LEADED  Offline

Joined: Jul 2011
Posts: 114
MICHIGAN USA
Is this Powerplant DOD ? . Will see if anyone have info . Thanks

Re: New 4.2L V8 from GM and Cadillac [Re: LEADED] #4702057
03/21/18 02:57 PM
03/21/18 02:57 PM
Joined: May 2012
Posts: 2,463
The land of USA-made Subies!
SubieRubyRoo Offline
SubieRubyRoo  Offline

Joined: May 2012
Posts: 2,463
The land of USA-made Subies!
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.

Re: New 4.2L V8 from GM and Cadillac [Re: ARCOgraphite] #4702068
03/21/18 03:05 PM
03/21/18 03:05 PM
Joined: Oct 2014
Posts: 13,319
Canyon County Idaho
CT8 Offline
CT8  Offline

Joined: Oct 2014
Posts: 13,319
Canyon County 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


2015 Ford F150 2.7
2018 Ford F350 6.2
Re: New 4.2L V8 from GM and Cadillac [Re: CT8] #4702078
03/21/18 03:13 PM
03/21/18 03:13 PM
Joined: Sep 2010
Posts: 8,221
Texas
4WD Offline
4WD  Offline

Joined: Sep 2010
Posts: 8,221
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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