GM's New V8.... Lets see how this one works out!

[Motorhead]

Looks very user UN-FRIENDLY!!!

Automotive Engineering International Online: SAE Technology Newsletter

 

[Gary - K7GLD]

THIS was an interesting statement:

The Duramax was designed to fit within the ultra-compact envelope of GM's small-block gasoline V8. Its NVH profile also targets the gas engine. These aggressive requirements drove many of the engine's innovations announced to date.

Looks like GM is preparing the way to include diesel power into some of their other vehicle platforms - shucks, that diesel powered Corvette might just show up yet!

 

[JasonCzerak]

Well, for once, something has improved in the V8 world. . Some rather neat ideas for sure. I like the idea of reversing the head ports. That's for sure a "why didn't I think of that department.

 

[BigEasy]

the only thing that really looks like it could be a bad idea to me, is the fact that they made it a 72 degree V and added a balance shaft... can you say "2. 8 and 3. 1 oil leaks"?

 

[RHestand]

I've been wondering for years when someone would come up with the idea for a v/8 diesel with the exhaust exiting where the intake ports used to be.

This idea first hit me when I saw an old 1930s flat-head Cadilac with this configuration. ( Exh. manif. on top of eng. )

It always looked like it would be so much more efficient to have all the exh. ports exit vertically as a group, then up into the turbo, as opposed to down and around the corner, typ. Power Stroke and Duramax v/8s.

BigEasy: I also don't like the 72 degree v, and slinging a balance shaft. To me that sounds like engineering by committee.

On the positive side, I like the HP & torq. specs.

It will be interesting to see how well it works and evolves, in the real world.

Motorhead, thanks for the link.

Ray

 

[tgordon]

Thanks for that reading. The intake sorta looks like a Cummins, part of the head/bolted to it, they definatly copied the intake grid heaters, must be they want to go to direct injection:-laf It is definatly going to be interesting how this will play out. I thought they ran the exhaust on the outer side of the V for heat dissapation. But I definatly see an advantage to doing it that way for the turbo.

 

[nickleinonen]

I've been wondering for years when someone would come up with the idea for a v/8 diesel with the exhaust exiting where the intake ports used to be

gm did that 50 years ago with the emd diesels... but they are 2 strokers. .

but that is a good idea for a turbo vee engine. . keeps in more heat in the exhaust and easier hot plumbing. .

i don't like the CGI block, but i do like the cracked main caps. . very cool

i hope it does work out to be a great little engine

 

[RHestand]

gm did that 50 years ago with the emd diesels... but they are 2 strokers. .



but that is a good idea for a turbo vee engine. . keeps in more heat in the exhaust and easier hot plumbing. .



i don't like the CGI block, but i do like the cracked main caps. . very cool



i hope it does work out to be a great little engine

Nick,

I'm just curious, I'm not familiar with the emd diesels by GM.

I am somewhat famliar with the old 4/71, 6/71, etc. Detroit two stroke GM diesels, are they one and the same?

I love the sound of those old Detroit two strokes.

Thanks,Ray

 

[rbattelle]

i don't like the CGI block,

Why? I thought CGI was the future.



One problem with the exhaust collector in the lifter valley is heat, isn't it? I mean, seems like it would be easy to cook the oil up there.



When Automotive News did a story about this engine a few months ago I got the impression this specific engine was bound for GM light-duty trucks (Suburban, 1500 Silverado), and the DMax would be retained for the heavy-duty trucks (2500-3500).



Ryan

 

[TFucili]

Heck, all they had to do was dust off the old 5. 7 convert-o-diesel, and put common rail on it

 

[RJWEST]

I would take an OLD 5. 7 diesel, 25+ MPG in a full size truck...
( it wasn't a converted gasser, by the way only Ford did that. )

I wonder how the heat build up in the heads will be handled ,
Must have some big coolant passages, and huge radiator.
But, They are GM Engineers, The DMax didn't have any problems
with overheating ,?

 

[RHestand]

I would think if they designed a "spider" type exh. manif. (open through the valley) they would be able to deal with the heat. Also it's OH cam, so maybe a deeper valley?

Ray

 

[MCummings]

But, They are GM Engineers, The DMax didn't have any problems

with overheating ,?

hahah. nope, no problems there...



Personally, it's a great idea, and I like it. I hope the Cummins in the Dodge 1500 comes that way instead of the spaghetti of piping a single turbo V configuration has to endure. I would like to see a 90* V-6 in the 1/2'er.





Merrick

 

[JFaulkner]

Nick,

I'm just curious, I'm not familiar with the emd diesels by GM.

I am somewhat famliar with the old 4/71, 6/71, etc. Detroit two stroke GM diesels, are they one and the same?

I love the sound of those old Detroit two strokes.

Thanks,Ray

Here is a link to info on EMD.

 

[nickleinonen]

Why? I thought CGI was the future

i believe navistar/ford use cgi in the 2002+ 7. 3 psd con rods. . they didn't like any extra load and liked to snap.

the cylinder walls i don't know how long they will last unless they sleeve them. . the main caps will need to be really well supported [4 to 6 bolt imho]

 

[Vaughn MacKenzie]

I would think if they designed a "spider" type exh. manif. (open through the valley) they would be able to deal with the heat. Also it's OH cam, so maybe a deeper valley?
Ray

The next DMax has some good features IMO. Having OHC should help with the heat issue since it means short exhaust ports. I am wondering if what they mean by no exhaust manifold that maybe the turbo inlet is integral to the exhaust manifold, ie it's one piece, and with it removed you would still have exhaust ports.

The Cadillac V16 had intake and exhaust on the outside of the engine, two sets of intakes & exhausts #ad
The Cadillac V16 was amazingly innovative and ahead of its time, had cast iron cylinders integrated in pairs with lifter assemblies mounted in an aluminum block. . . probably the most mass-produced aluminum engine of the day.

 

[Moose]

I hope this dpesnt mean what I think it means:

"The Duramax is package-protected for closed-loop cylinder pressure monitoring, a technology GM will introduce on its new 2. 9-L turbodiesel V6 next year in Europe. "

To me that says they might have come up with a way to prevent bombing... . Either that or they made it easier for the dealership techs to firgure out what blew up..... If they have Dodge and Ford are sure to follow suit.....

Interesting tech none the less



Moose

 

[JFaulkner]

I hope this dpesnt mean what I think it means:



"The Duramax is package-protected for closed-loop cylinder pressure monitoring, a technology GM will introduce on its new 2. 9-L turbodiesel V6 next year in Europe. "



To me that says they might have come up with a way to prevent bombing... . Either that or they made it easier for the dealership techs to firgure out what blew up..... If they have Dodge and Ford are sure to follow suit.....



Interesting tech none the less







Moose

If someone can build it, someone can defeat it. Some of the best engineers don't work on the OEM side of the market.

 

[steved]

I would take an OLD 5. 7 diesel, 25+ MPG in a full size truck...

( it wasn't a converted gasser, by the way only Ford did that. )

Actually, GM did convert a gasser into a diesel... it was a 5. 7L and primarily found its way into cars of the early 80s... typically Olds and Buick land barges.



The diesel used in the trucks was an actual Detroit, but it was the naturally aspirated 6. 2L... I don't think they ever made a 5. 7L for the trucks, at least not that I'm aware of...



steved

 

[nickleinonen]

. I don't think they ever made a 5. 7L for the trucks, at least not that I'm aware of...



steved

my pop had one [before i was born]... until it broke a rod. . then it got a 350 gasser. .



we've had that 5. 7 and 6. 2 & 6. 5td diesels. . we had a 4. 3 v6 aluminum head diesel too in a cutlass sierra front wheel drive... heads were warped on it as gm engineers had their heads up some horses back end and set the thermostat on the cooling fans way too high [+200°f]. .