According to GM, HCCI is dead.

Cylinder deactivation might be changing because there's new tech that can deactivate any cylinder individual for any cycle

3V per Cylinder could be cool. I would expect the engine block would have a common integrated exhaust manifold like the I-4's and V6's.

 

The Gen IV architecture is still relatively new, so I don't see them changing anything major until 2025.
Hopefully we'll see a small diesel, but other than that, I wouldn't expect anything anytime soon. The
changes will be to the body of the trucks, aluminum will be used in certain areas to reduce weight, mixed
in with HS Steel, ala the CT6.

 

I dunno about 2025, but it IS only just 3-ish years old. Only about halfway through to a new program.

 

Yea, I don't think we will see a new generation of small block (it is possible but not likely) as there really isn't any new technology out there. There are things that they could do which would bring improvements to the line, however I just don't see them doing it for the reason of a lack of need.

The two things I would like to see is a bigger bore spacing (4.6 vs 4.4) and concentric camshaft VVT, those two things would be great IMHO.

 

Do you guys ever foresee GM moving away from pushrods?

Just curious more than anything...

 

Up until now rumors are there are 2 v8 in near future
1. 4.2 l v8 TT DOHC
2. 6+ l v8 DOHC
There was some rumors some years ago about 3.xx l v8 DOHC also.
But nothing has been confirmed yet.
Also i don't think if GM will build any of this engine that it will be only for luxury or super sport car...but who knows..maybe they surprise us.

I'm not sure GM will move from pushrods (especially v8)..at least not in the near future.

 

The only other "confirmed" engine that is coming from GM is the 4.2 twin turbo engine as has been confirmed by JDN himself.

Rumors exist about an LT5 engine, though not confirmed or denied by GM.... any other future V-8 engine is unknown at this point.

 

To be honest, the DOHC LT5 was most likely a typo (the same typo existed on the LT1 being stated as OHC as well)......

If Cadillac is getting a V-8 engine of its own and one version is 4.2L I doubt the block is big enough to support 6.2L. The old North Star had a 4.00 inch bore center spacing and the Ford modular motor/coyote has a 3.397 bore center spacing. The Ford 5.8L uses a really long stroke (4.165 inches) to get to 5.8L, they would have to do some things to make a modular block that could support strokes even longer then 4.165 inches. Though counter to that is you are hurting the engines ability to rev. I doubt if they are making a Cadillac V-8 with an early target displacement of 4.2L that they will make the block big enough to realistically support engine sizes as high as 6.2L. The 5.0L Coyote is taller and wider then the 6.2L LS3 and that is with a smaller block, give the Cadillac a block as big as the Chevy small block and it won't fit in the Corvette and probably wouldn't fit in the Camaro engine bay.

I believe we will see a Cadillac exclusive V-8 engine that is based on a smaller block (like the North Star) which makes more sense from a packaging stand point which would have a maximum engine size of around what the North Star had. Making it small and with a turbo will allow it to fit in engine bays that were designed around 2.0T and V-6 engines. If they made a small block chevy sized block with DOHC the trucks might be the only thing it could fit in at GM. Remember the small block chevy will support engine sizes as high as 7.4L (454).

 

I really don't think the DOHC reference was a typo, we've heard from other places therr may be a DOHC engine in the works. I believe it was Kaltech, but I can't remember the exact source.

Dohc may be mid engine Corvette only though.

The new trucks and c8 Corvette will bring about either a gen6 engine or improvements to the gen5.

 

What is old is new again. GM just announced the gen 6 small block V8 for 2025, at least for trucks and SUV's. It will be for everything of course, they're doing a gen 6 to meet draconian 2025 pollution and mileage standards. That probably will require 4 valves although GM hasn't announced specs. The midenginecorvette forum opened a page about the new V8 and closed it the next day. GM doesn't want to lose Corvette sales with people waiting to get a DOHC LT1, if the gen 6 retained the OHV they would have said so.

 

Yeah the Corvette Forum has a few threads speculating about a DOCH CPC 6.3L "LT3" version of the LT6 that would be the new Gen VI V8s, definitely cool stuff to think about! Jordan Lee was also quoted in an LT6 article saying the LT6 is a "small block" b/c the small block team developed it, and pointed it out has the 4.4" bore centers. So a Gen VI could certainly be DOHC, and like you say emissions standards may push them that way.

One of the guys that had a lot of "good guesses" about the LT6 is suggesting it, so we'll see what we get!

 

I would not expect a DOHC V8. Too big and unnecessary. The pushrod V8s have been more than adequate for GM's needs and make it easier to integrate.

 

I am wondering if this new Gen/Update is merely to get the existing motors to meet the new emissions regs..... I'd hope for more power/mpg/etc....

 

Why isn't anyone talking about the gen 6 v8. Don't GM people care, that's a rhetorical question, they've been making Chevy v8 for 70 years!

 

I’m seeing mums everywhere. I would have thought it would have been revealed by now as the 2025’s are about to roll off the lines. Looks more like a 2025 unveiling in a 2026 YM. We might get a reveal of the 6.2 version in a new Vette stingray latter this year. Right now everything is about the ZR1. Per their press release, they’ve retooled block, cam and intake. No words about heads so we’ll probably see pushrods continue. If I had to guess, they might go from AFM to Vtec system using the colasable lifter as a means of swapping between high and low lift. That way they can claim no more AFM problems, have a very efficient grind with a selectable high performance lobe. Already you can gain 100+ RWHP with just a cam swap so there’s a lot on the table with gen V small blocks. They are also mentioning new intake manifolds, so we’ll probably see a variable runner manifold tuned to 2800, and 4800 rpm, which will be sweet on the trucks. Bette might see 3800 and 5300 rpm plenums