• Dec 17th 2007 at 4:31PM
  • 28
At least one person has lamented the lack of diesel options for the H2 SUT. In case that's you, PickupTruck.Com speculates that the coming H2T (the new name for the H2 SUT, to bring it in line with H3T naming) could be offered with a diesel. The clue is in the big-bore tailpipe seen in the spy shots, which could indicate the use of a 'venturi-effect' tailpipe. It's the kind of setup GM uses on its Silverado and Sierra HDs to keep the oil burners from spewing black smoke.
PickupTruck also wonders if this is the first truck we'll see with GM's 4.5-liter light-duty diesel. Sure, it's all guesswork right now, but we're betting GM would make more than one person happy by offering diesels in its revamped H2 line -- especially if, as some people are saying, it's going to get even larger in its next iteration.

[Source: PickupTruck.Com]

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    • 1 Second Ago
      • 7 Years Ago
      "Brett, Wal-Mart is having great sales on bicycles, go buy one and join a bike blog. You're definitely not a car guy."

      Now that is an erroneous tangent you are on. I happen to own an S2000 and a carbon fiber bicycle made in France of all places. And yes I still am a "car guy."

      Sometimes I speed in my S2000 taking it up to 9,000 rpms and other times I commute to work on my two wheeler doing upwards of 32 mph! Beat that!
        • 7 Years Ago
        I drive my Hummer to work on some days and my Cobra, 1> mpg city baby!, to work when it is nice out. So Ha.
      • 7 Years Ago
      I'm not a big Hummer fan, but I dont need any dirtballs like Bret telling me what to Drive either.
        • 6 Years Ago
        jim and others like him....why so personal...Brett made fair comments and did NOT receive any substantiated rebuttle, just abuse and sarcasm....I do offroad, and here in England, Scotland and Wales and hummer/humvee IS too big, for OUR trails...its also not as competent as is made out, the panda 4x4 current and past CAN run rings around it on many trails, not only that it couldnt get between gaps in rocks and trees that pandas and suzi's could....however, if you want to take something large, buy a rusian tracked beastie, then you CAN go through trees and still use less fuel, andit doesnt have to be laboratry quality...

        enough said!?
      • 7 Years Ago
      With the diesel, owners can expect their fuel mileage to be in the high single to low double digits now.
        • 7 Years Ago
        The difference with diesels is that from the factory they get terrible mileage, but after break-in the mileage and emissions improve considerably. It's not unusual to see a Duramax or Cummins get 20+ mpg after break in. Heck, the Cummins race car that Banks built gets over 20 mpg and even tows its own trailer to the salt flats.
        • 7 Years Ago
        they already average 10 to 12 mpg, 13 if you're driving mrs daisy. diesel + a 6 speed should get it to 14-15 at least =)
        • 7 Years Ago
        Just a joke! But seriously (from Wikipedia):

        Forbes notes "H2 gets a paltry 13 mpg on the highway and 10 mpg in the city." Motortrend observed 12 mpg. Car and Driver observed 10 mpg. A reviewer at about.com got 8.6 mpg. Edmunds observed 9.2 mpg. Four Wheeler magazine observed 10.8 mpg in their final long term report of a H2 SUT. Their worst tank was 7.2 mpg and best tank was 15.3 mpg. Consumer Guide observed 10.7 mpg, even with mostly highway driving. Automobile Magazine averaged less than 10 mpg. US News observed 9.5 mpg according to its trip computer. Cars.com observed 11.4 mpg according to its trip computer in mostly highway driving. Car and Driver notes that the 2008 H2 is more efficient than previous models and will get 11.5 mpg.
      • 7 Years Ago
      @ 4x4north. Sure I don't have any experience off road, but just because my opinion of your precious gas sucker isn't favorable does not mean that I don't love cars.
      • 7 Years Ago
      yeah- what Pete said!
      Also, the 'venturi-effect' tailpipe is not implemented so a modern diesel doesn't "spew" black smoke. The particle trap takes care of that. The mixing tailpipe is there to cool the exhaust stream, which can become much hotter during the regeneration phase than gasoline or traditional diesel exhaust. Also, Partticulate standards will not change in 2010- they are already in effect. Only the allowable NOx levels will drop considerably.
        • 7 Years Ago
        glad to see someone else caught that too.
        • 7 Years Ago
        That's not Jonathon's fault. I should have better written the paragraph in the story describing the Venturi effect and why it's needed.

        Guenther, you're 100% correct. A Venturi pipe does nothing to stop black smoke from belching out the back.

        The truck's diesel particulate filter (DPF) traps almost all the soot (black smoke) from the truck's exhaust, so it doesn't pollute the environment.

        The DPF is placed between the engine and the tailpipe exit.

        After a while the DPF gets gummed up with all the soot it has caught. A sensor picks up on the increased back pressure in the exhaust stream and triggers the engine to dump metered amounts of fuel into the DPF, where the fuel burns up the trapped soot in a process called regeneration (technically, 'active' regeneration). Temperatures rise to about 1,100-F for approximately 30-seconds to clean out the DPF, like a self-cleaning oven. This also uses about 1/2-gallon of diesel fuel.

        As you can imagine, especially during active regeneration, there are some very hot gases coming out that exhaust. You wouldn't want a person or vehicle next to it! So, using the Venturi effect of the dual split pipes, cool outside air is mixed with hot exhaust about a foot before the final exit. This simple step greatly cools off the exhaust at the very tip of the tailpipe.

      • 7 Years Ago
      I'm not sure how anyone can call a 4.5 Litre diesel motor "light duty"
      • 7 Years Ago
      GM could easily improve the fuel economy and better performance of these trucks it's criminal that they don't.

      Fortunately, people like Johnathan Goodwin are taking matters into their own hands. Read the article at the link I posted below:

      • 7 Years Ago
      Der...the 4.5L diesel is already confirmed as an option for the 2009 H2...
      • 7 Years Ago
      Hummer seriously needs to die.
        • 7 Years Ago
        Hey 4x4 guess what I do know what I am talking about. Hummers too big for a lot of trails and 90% of people don't even take the off road. Many older jeeps and pickups and even the Fiat Panda 4x4 can run circles around Hummers. So my rant was completely justified.
        • 7 Years Ago
        I'm not an SUV fan or off-road guy, but the comment 4X4 North made (he beat me to it) "You've got people buying sports cars that never use it for anything else but daily commutes. Should we stop building sports cars?" is my thoughts exactly.

        I love sports cars, own them, yet can never fully use their potential 95% of the time (until I get to the race track a few times in the summer).

        Having a large SUV capable of going almost anywhere is to an off-road enthusiast what a large 4 sedan with stupid amounts of power is to a sports car nut like me.

        But last I saw, no one was ragging on the M5, RS6, SRT8 Charger, etc.

        • 7 Years Ago
        Brett: I know it's beyond your knowledge, but yes, H2's do go where other SUV's and Full Size trucks can't go. Infact, other than the H1, there is no full size that can go where an H2 goes in stock form. When you learn about approach angles, departure angles, and breakover angles, you'll quickly see why no other stock pickup or SUV can offroad.

        See, if you're going to knock something down, atleast take the time to familiarize yourself with what you want to hate. That way, when you start to ramble, instead of looking like an idiot who doesn't know what he's talking about, you just look like an idiot who simply hates what he can't attain.

        - 4x4North (Yes, someone who actually offroads regularly with HUMMER's, Jeep's, and Toyota's, modded and unmodded, it's nice to KNOW what you're talking about, eh?)
        • 7 Years Ago
        Pete, Don't you see how Hummers are hurting Mother Earth? Hummers make Gaia cry.

        God knows that people should only drive cars that have been certifed by some Sierra Club a-hole not to hurt a chipmunk if you run it over.

        Brett, in a free liberal society, people have a right to drive what they want. I can not get over how you pompous and arrogant sh!t heads think you know what is best for society, what is best for the environment, or what is best for everybody else. We all have a brain, and we can think for ourselves. Take your eco-religion to AB Green.
        • 7 Years Ago
        "Ok. My reasoning for the above comment is quite simple. For one, there is nothing a Hummer can do that any other Full size truck or suv can't. And for the most part, drivers of said massive good for nothing suvs are pricks that are just trying to cover for their shortcomings. Finally there is absolutely no reason for another gigantanormus vehicle with terrible fuel economy."

        replace Hummer with Porsche/Ferrari/Lamborghini/etc, and truck/suv with car and see what the reaction is
        • 7 Years Ago
        Guenther: Although a front locker and disconnecting sway bars might help in some occasions, it's not a necessity and certainly doesn't override approach, breakover, and departure angles, and ground clearance. The powerwagon only has 8 inches of ground clearance, and some very average angles.
        • 7 Years Ago
        Haha, too big for a lot of trails, that's funny... That right there tells me how much experience you have offroad.

        Actually, it's 30% of owners that take it offroad but that's not relevant. You've got people buying sports cars that never use it for anything else but daily commutes. Should we stop building sports cars? Hell no, sometimes I wonder why you people even visit an automotive website, you definitely lack the love for these things.

        Alas, there's no doubt H2's and H3's are very capable rigs in stock form, they've proven themselves. I can't wrap my head around why people who have never done any offroading (other than a picnic) would even care to knock down vehicles that A) They have never driven offroad, and B) certainly don't care about the sport.

        Brett, Wal-Mart is having great sales on bicycles, go buy one and join a bike blog. You're definitely not a car guy.

        • 7 Years Ago
        Because of the small fuel sipping vehicle Brett chose, without a doubt his "thing down there" must be humongous without a doubt. He must be proud. He also wants to save the earth. Wow it is great to see a model citizen thinks.(sarcasm)
        • 7 Years Ago
        I wouldn't say hummer needs to, but 90% of the people that buy a hummer need to die. They never take it off road, the whole "not that I would, but I could" trash. Its like buying a big, stainless steel grill (for food), then never actually using it to cook because it will get dirty. But hey, it stores Christmas decoration nicely!

        Don't buy them if you aren't gonna take them offroad at least twice a year or tow something! Your cock isn't gonna get any bigger.
        • 7 Years Ago
        Why? Please give me a real answer, but be reasonably succinct.

        • 7 Years Ago
        Ok. My reasoning for the above comment is quite simple. For one, there is nothing a Hummer can do that any other Full size truck or suv can't. And for the most part, drivers of said massive good for nothing suvs are pricks that are just trying to cover for their shortcomings. Finally there is absolutely no reason for another gigantanormus vehicle with terrible fuel economy.
      • 7 Years Ago
      While GM announced the 4.5L diesel is going in the Silverado, Sierra, and H2 I would love to see it in the Suburban/Yukon XL and Tahoe/Yukon. Better highway mileage than their hybrid, while still being able to tow over 6,200lbs (which is a joke for a full size SUV with a 6.0L V8, My little GMC Envoy tows more than that).

      I would also love to see it in their Canyon/Colorado. 310hp/520ft-lbs of torque would be insane in that ~3500lb truck, plus I bet it would get better fuel mileage than the inline-5 they use now or the 5.3L V8 it's getting soon.
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