07+ LMM Duramax - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 13 (permalink) Old 07-03-2006, 02:21 AM Thread Starter
4cstr
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07+ LMM Duramax

Rumor has it that GM will be coming out with a new version of the Duramax for 07...coded LMM. I've also read that the only difference between this engine and the LBZ might be the addition of a particulate filter.

If you have any further info...post it on up.

Dave
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post #2 of 13 (permalink) Old 07-03-2006, 03:01 AM
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Thanks Dave! Time to start shaking the trees for information!
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post #3 of 13 (permalink) Old 07-03-2006, 03:04 AM
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I bet the fuel mileage will increase now

Turbo life just decreased by 1/2

AKA dmaxfan
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post #4 of 13 (permalink) Old 07-03-2006, 08:15 AM
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Hopefully, if the rumor turns out to be true, you'll need to start a new section for the LMK 4.5L V8 diesels in the 1500s, Suburbans & Tahoes.

'06 GMC Sierra 2500HD LBZ/A CC/SB 4x4
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'00 Chevrolet Silverado 2500 6.0 EC/SB 4x4 w/237k miles sold
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post #5 of 13 (permalink) Old 07-05-2006, 01:31 AM
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Don't know bout the engine for sure, been told the body style is definately changing. Supposed to look more like the Envoy! Don't know if that'll be good or bad though, have to wait & see!
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post #6 of 13 (permalink) Old 07-05-2006, 01:48 AM
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These are the only paragraphs I've seen about the new engine:

http://www.autoweek.com/apps/pbcs.dl...024/LATESTNEWS

I also found these GM docs dealing with the particulate filter:

http://www.gmfleet.com/gmfleetjsp/us...esel_Flyer.pdf

http://www.isuzucv.com/images/engine...ionsBro_GM.pdf
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post #7 of 13 (permalink) Old 07-09-2006, 03:11 PM
 
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i "heard" that the motor change is coming with the body change. the very first 07's will still look like the 06's, then the new body/motor
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post #8 of 13 (permalink) Old 07-09-2006, 04:26 PM
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Quote:
Originally Posted by vern
i "heard" that the motor change is coming with the body change. the very first 07's will still look like the 06's, then the new body/motor

Yep...I guess they're calling them "Classic". So I guess we all own "Old Body Style" trucks now.

LMM is supposed to show up around Jan 07 from what I've read.
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post #9 of 13 (permalink) Old 07-10-2006, 10:26 PM
 
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I worked with a person that was deeply involved in the motor. Here are a few things that were mentioned to me.
1. New rod and main bearing retaining bolts
2. New head gaskets (Its a riveted design)
3. Intake air valve (like a gas throttle body???)
4. Using one wild looking tailpipe called a jet pump
5. 5 pulse injection per power stroke
6. Particulate filter
7. Grid heater and glow plugs. The reason behind the 1000 watt grid heater is to keep the engine warm during low load like idle and to aid engine warm up

8. I was also told it watches the amount of soot and if soot levels are too high the egine turns the mil light on and causes a limp home mode. This will be the biggest challange to us hot rodders. Most likely all brands go to somthing like this and we will all have to deal with it eventually.

9. Last thing was that the engine is designed to run on ultra low sulfer.

Hope this helps give you guys a idea of what to expect!
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post #10 of 13 (permalink) Old 07-11-2006, 02:32 PM
 
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Guys,
One more thing I would like to add. The throttle valve I mentioned earlier is supposed to actually throttle air like a gasser. Why would a diesel need it? Gm's EGR is supposedly much more effective under a vacuum than a open air plenum. I have not seen it (the detailed shots of the throttle valve) yet but from the pics I saw she looks a lot more crowded on top of the engine with all the grid heaters and stuff.
Just wanted to provide a little more detail on the subject.
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