[free_energy0]

Agreed. But it still sounds like a UPS truck. They should really spend some R&D dollars on making the engine more acoustically appealing.

Such is the nature of two I-5s without an H-pipe.

 

[exmechanic]

Come on insiders( you know who you are guys). Shed some light on this confusion.

I have talked to an 'insider' at our local engine plant and they are doing some preliminary work on 3 new engines, 2.8 and 3.0 litre 'high feature' V6 and a OHC V8. Wouldn't give size or any other info.

 

[AMcA]

Especially with the Ultra V8 coming.

What do we know about the Ultra V8?

What technologies will it use? DI? DOD? VVT? It oughta have something new, cool and unavailable otherwise . . . .

Tell you what I want to see: small 3.5L? twin turbo. DI. DOD. VVT. 350 hp, and 35 mpg highway in an STS.

Possible?

 

[AMcA]

I think GM needs to go back to the 5.7L engine size... the 350 (from any gen SB) can make insane power with minor (or not minor depending on how you look at it) changes.. I mean the LS1 will make 400HP and TQ just like an LS2 with out increasing displacements with a simple head and cam change... I don't understand why GM had to start making ever new version of the small block V8s bigger than that last gen.... hell, the 3.8 turbo engine from the 87 and 89 Turbo buicks and TTA can make insane power.....

GM needs to concentrate on making engines smaller with out losing much power. The 4.0L from the aurora being a prime example, 250HP and 275TQ from 4.0L at the time was awsome, now they are getting that from V6 engines... think if they had kept developing that engine, we might have a CTS-V with a 4.2L DOHC V8 making 400HP and 390TQ or somthing ....

They oughta give it DOD, too. I don't think DOD is necessarily incompatible with a performance car: it's totally transparent in operation, and programming can easily make it stay out of the way in spirited driving.

 

[asrapid]

What do we know about the Ultra V8?

What technologies will it use? DI? DOD? VVT? It oughta have something new, cool and unavailable otherwise . . . .

Tell you what I want to see: small 3.5L? twin turbo. DI. DOD. VVT. 350 hp, and 35 mpg highway in an STS.

Possible?

According to rumors northstar 2 (or ultra) will have DI,vvt etc.Maybe it will use this features only in cadillac models ...who knows.
3.6 l V6 tt with around 400-420 hp would be nice also

 

[JCS30TH]

While I don't like the idea of having DOHC on an engine that seems to be doing just fine with OHV and 2 valve per cylinder (and hasn't even used 3 valve pushrod heads or DI on any engine, let alone AFM or VVT on the Vette), the document does seem to support the DOHC 6.2L V8 engine. See around pages 51 and 55:

http://www.futureoftheunion.com/docs/delphi/Ex1toproposedorder149pages.pdf

I also wonder, since we've heard absolutely NOTHING about the Ultra V8 in recent memory, if Cadillac just got lazy and decided to slap a set of DOHC heads on a Chevy smallblack (as in the original ZR-1) and call it a day. That engine would be well placed to go up against the Mercedes AMG "63" DOHC V8 (which actually has 6.2L as well). The only problem then, is with the tall DOHC heads on a big V8, while these engines would fit into the Escalade and pickups just fine, how well would they fit under the hood of the cars?

I really hope GM knows what they are doing with this move. The simplicity of the OHV motors has made them affordable, durable, torquey, fuel efficient, compact, light, and led to a loyal following--something you can't quite say about Ford's modular V8s.

What he said

 

[MonaroSS]

Come on insiders( you know who you are guys). Shed some light on this confusion.

I'm not an insider, but I'll give you my prediction. Below may be a pic of the new Ultra V8's twin.

This is the new Duramax 4.5 Turbo diesel with alloy dohc heads, compacted graphite iron block and it fits everywhere an LSx V8 fits.

You all remember the failure of GM trying to make a diesel from a gasoline V8? Well it's much easier the other way around, especially if you planned it all along. Imagine the 4.5 Duramax with a thin wall aluminium block, lighter crank and pistons, and DI gasoline/E85 fuel system (it’s already set up for DI, and I bet the spark plug access space is already cast into the head shape). Then imagine it in both naturally aspirated and turbo versions from 3.8 to 4.7 capacities. And remember E85 ethanol burns better in a turbo engine.

VW has made claims that the only way for IC engines to continue to meet future fuel and CO2 standards is with turbo-charging. GM has designed and plumbed this engine to be the best, most efficient and economical to make turbo engine they have ever designed.

 

[asrapid]

But here is talk about 6.2 l DOHC V8. not 4.7. There is rumors about 5.0 V8 but until now i don't recall rumors about 6.2 l V8 DOHC.

 

[Xenon]

So no more top end OHV motors? Sounds like LSx motors and Northstar will merge into one motor lineup. Change is good...

 

[talonsaab]

The twin turbo is rumoured to be the 3.6L or 2.8L Saab version of the HFV6 but maybe it will be on the new 3.0L version. Balance of high power and fuel eff.

What ever happened to the 6.3L 3 valve OHV pushrod V8 ?

 

[Z06ified]

Twin turbo 3.6L with direct injection running on E85 sounds good to me. That should be good for about 450hp. :drive:

 

[F14CRAZY]

Pushrods, please.

 

[EldoFan]

I'm not an insider, but I'll give you my prediction. Below may be a pic of the new Ultra V8's twin.

This is the new Duramax 4.5 Turbo diesel with alloy dohc heads, compacted graphite iron block and it fits everywhere an LSx V8 fits.

You all remember the failure of GM trying to make a diesel from a gasoline V8? Well it's much easier the other way around, especially if you planned it all along. Imagine the 4.5 Duramax with a thin wall aluminium block, lighter crank and pistons, and DI gasoline/E85 fuel system (it’s already set up for DI, and I bet the spark plug access space is already cast into the head shape). Then imagine it in both naturally aspirated and turbo versions from 3.8 to 4.7 capacities. And remember E85 ethanol burns better in a turbo engine.

VW has made claims that the only way for IC engines to continue to meet future fuel and CO2 standards is with turbo-charging. GM has designed and plumbed this engine to be the best, most efficient and economical to make turbo engine they have ever designed.

Mmmmm.......me likey......:dro: haha

In all seriousness.......this thing could put up a decent fight (or perhaps spank) Ford's upcoming TwinForce family......

 

[Michael_S]

Mmmmm.......me likey......:dro: haha

In all seriousness.......this thing could put up a decent fight (or perhaps spank) Ford's upcoming TwinForce family......

Ford is supposedly working on a smaller displacement diesel offering for the F-series too.

 

[asrapid]

When can we expect to see 4.5l V8 diesel(before or after northstar II)? Will GM put that in cars to or just in truck?
And if there will be 6.2 l V8 DOHC gasoline engine to go in truck how much power will they produce..I mean if there will be something like 450 or even 500 HP...isn't that little bit to much for SUV?

 

[robb4964]

Well according to another leaked document( thanks for keeping the secrets UAW), the 6.2 V8 might be making the move over to an overhead cam design for the Gen V Small Block. While the little brother, 5300 is going to be replaced by a mystery engine, but will remain OHV.



More here

IMHO, doesn't sound very cost effective having two versions of the Gen V Small Block. Especially with the Ultra V8 coming.

I agree. The concept of adding complexity to something that performs just fine the way it is negates the attempt in financial recovery. In other words it dont make since to waste the money when R&D is done on the current platform wich works just fine and is still itself under development.

Not to say it isnt in the works, What do I know?lol But I dont see them phasing out the OHV engine anytime in the near future. Its a nich engine.

 

[robb4964]

What really matters is the total exterior size and weight of the engine and fuel efficiency.

In many applications, the 6.0 liter GM V8 gets better fuel economy than the Ford SOHC 5.4L, and of course it also has an extra 50 horsepower.

Compare the 2006 Cadillac CTS-V with the 2003 BMW M5. The Cadillac's OHV LS2 engine was 6.0 liters, the BMW M5 was a 5.0 liter DOHC V8. The Cadillac's engine made substantially less horsepower per liter, but the CTS-V was longer and wider than the M5 and weighed less despite having a larger engine displacement and more power. It also got better fuel economy.

The 2007 GMC Sierra Denali with a 6.2 liter OHV V8 makes better power and equivalent fuel economy and acceleration compared to the 2007 Tunda 5.7 DOHC engine. The Toyota engine has better horsepower per liter, but in the real world metrics that matter, the two are essentially equivalent.


GM has concept versions of its small block with direct injection. They're also using cylinder deactivation in production OHV engines. GM has variable valve timing on production OHV engines, and the new Dodge Viper even has independent intake and exhaust variable valve timing.

OHV isn't dead yet. I bet it will live on until we're all driving electric cars or using electrically actuated valve systems in our internal combustion engines (and in either case, OHC will be gone too).

Agree 100%

 

[Stéphane Dumas]

Also, wouldn't be possible to go with a simple OHC aka SOHC as well? Pontiac got once the inline-6 OHC in the mid-1960s and once attempted to do a 421 OHC of its V8 family to compete against the OHC version of Ford FE-427 but the project was aborted

 

[Michael_S]

Also, wouldn't be possible to go with a simple OHC aka SOHC as well? Pontiac got once the inline-6 OHC in the mid-1960s and once attempted to do a 421 OHC of its V8 family to compete against the OHC version of Ford FE-427 but the project was aborted

Honda and Mitsubishi both have some moderately good variable valve timing with their SOHC, 4-valve per cylinder V6s. GM may want to do something similar.

 

[asrapid]

So is this engine also dead like ultra v8 or not?..maybe they plane to use same crankshaft, piston, piston rod etc from next gen small block but it will have dohc heads and different block to accomodate this DOHC heads?