GM staying with 6.6L displacement - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 10 (permalink) Old 01-20-2010, 08:45 PM Thread Starter
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GM staying with 6.6L displacement

I have been wondering lately, why has GM stayed with the 6.6L for so long... Ford and Dodge have both up'ed their displacement in the past few years with totally new motors, but GM has stayed with the 6.6... I understand that this was the largest of the 3 brands for the past 7 years, and a very tried and true design. Ford knew they couldnt get anything extra reliably out of the 6L. Dodge up'ed theirs because of new emissions requirements that made it hard for the 5.9L in stock form to compete (I assume). So now the 3 companies are very similar in displacement, but Ford and Dodge have totally redesigned engines (Ford being the most radical redesign of the two). My question becomes, while Ford and Dodge are putting out more power with new technology, GM seems to be using the same basic technology, but just upping the ratings to show similar numbers.... Does this thinking make sense to anyone? I'm not brand loyal, I have best friends with both dodge and Gm trucks, but it has made me wonder lately...

It also brings to light the question of whether there is a ton left in the aftermarket if the same engine has had its rating turned up with tuning or what have you for the past couple years....

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post #2 of 10 (permalink) Old 01-20-2010, 08:58 PM
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Your right the displacement has stayed the same but many things in the motor have changed since it has debuted. ie injectors, turbos, among other design changes. That's why there are different engine codes. LB7, LBZ, LLY, LMM, LML

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post #3 of 10 (permalink) Old 01-20-2010, 09:12 PM Thread Starter
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So are they reaching the limit on what extra parts they can change out? I know next to nothing about the changes the d-max has been through, but I would think they more than likely are going to run out of different parts to put on this motor... Take the design of the 4.5L, GM did the designing of that motor, so you would think they are going to incorporate that design into the HD trucks as well...

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post #4 of 10 (permalink) Old 01-20-2010, 09:39 PM
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Its not just bolt on parts that are changed. There is design changes to the heads, blocks that make each series a little different. The LML is almost a whole nother animal compared to the LB7.

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post #5 of 10 (permalink) Old 01-20-2010, 10:02 PM Thread Starter
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Maybe the more interesting aspect is the fact that someone like me is quite unaware of the changes that were made to this motor, all they ever say is it has the duramax, wheras you see advertising for the "new legendary 6.7L Cummins" and whatever Ford is going to say for advertising for their new 6.7L (which will be a lot). GM stays pretty quiet about their HD lineup as far as advertising goes. Their midsize lineup however gets tons of ad's with that ex football guy rattling out hp #'s and ratings during every commercial break... It would probably serve them better and sway more customers their way if they advertised a redisigned motor.

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post #6 of 10 (permalink) Old 01-20-2010, 10:26 PM
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The 6.6L just works great is all. Like StrokerPuller said each version is updated and improved over the last. Interesting to note though that with a simple crank change the current 6.6L can easily be changed to 7.1L. Might be GM's plan in the future, but with fuel economy all the rage now I wont be surprised if the displacement starts going down in the coming years.

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post #7 of 10 (permalink) Old 01-20-2010, 10:47 PM Thread Starter
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Maybe they should just start badging them as smaller than they are!! The new designs can make pretty darn good fuel mileage if they dont have all the emissions crap on them. I say put a badge on the truck that says 4.5L, have no extra emmisions stuff on it, it'll get 20mpg so the EPA will think its great, and the only ones who know its actually a 7.1L are the real dieselheads!!

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post #8 of 10 (permalink) Old 01-20-2010, 10:57 PM
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The 01' LB7 duramax shares only the displacement and name with the 11' LML, it has constanly evolved over the years, and only seems to get better every time, Gm/duramax has capitalized upon the EPA restrictions to improve upon the previous designs, every thing from turbos to pistons to injectors, block, head design, intake design, heck the LMM even has a throttle body to aid in dpf regens, the fact that they havn't needed a change in displacement should tell you something about the time and effort that has been put into designing them, and as you stated they just keep bumping the power without increase of displacement, just creative engineering is all it took and its quieter, and effectively meets epa regs and still remains reliable, can you say holey drilled turbo, or exhaust-flame-thrower??

the 6.6 remains for now, but there have been rumors of an increase in displacement up to the 7L range, much like robert has said, but that increase was supposed to be dealt to the LML, and it hasnt changed yet.... the one thing about the duramax is that mileage hasnt changed much from the LB7, some guys report a little worse mileage because of the active regen, but my LBZ gets roughly the same mileage as my Brothers LMM, and a little less then the gf's dads LB7

just because cummins and ford have a .1L size advantage over the duramax now, does that make them better motors? certainly not in the cummins' case, and time will tell with the scorpion

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post #9 of 10 (permalink) Old 01-20-2010, 11:25 PM Thread Starter
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I agree time will tell with the scorpion... That is a lot of new design which could be awesome, or could have growing pains.. I'd be willing to bet that if the scorpion is a hit though, GM will want to shortly start building the 7.XL

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post #10 of 10 (permalink) Old 01-21-2010, 07:46 PM
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As it has been said before, Gm took what they have and simply refined it. There is even more potential in the 6.6L; like a CIG block, using a head/intake/exhaust design similar to the 4.5L duramax, over head cams (like what Cummins is proposing for the 6.7L)

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