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whats does the lbz and lmm or whatever mean?

 
hustler_shan
Enthusiast
Posts: 430
Joined: 03/07
Posted: 03/28/07 11:58 AM

what do they mean i dont know and noone else know so i thought i would ask people on the d-max threads. does anyone know???? i have always wanted to know but know one i know knows.  Confused  
were pissin up a rope guys!!!

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hunter5.9
New User
Posts: 36
Joined: 03/07
Posted: 03/28/07 02:05 PM

I don't understand what you just said. No and Know are two totally different words.

Know - v. perceive directly as fact of truth; to believe to be true; to be certain of

No - adv. used to express rejection  

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Edward A. Sanchez
Administrator
Posts: 2112
Joined: 07/06
Posted: 03/28/07 02:29 PM

Hello. Good question. Here's my answer. I don't know if it's the answer, but it's the closest I can figure. Every GM engine is designated by a three-letter alpha-numeric code (RPO or "Regular Production Order." Case in point are the third and fourth-generation small-block V-8s. (i.e. LS1, LS2, LS7.) There have been four generations of the 6.6  Duramax V-8. The first was the LB7, then the LLY, then the LBZ, and the latest is the LMM. Hope this answers your question. In terms of what the letters actually "mean." I have no clue. I think they just randomly assign them. Anyone else know?  Smile  

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hustler_shan
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Posts: 430
Joined: 03/07
Posted: 03/29/07 08:01 PM

lol thx for the reply sanchez.   o and hunter5.9 are you a english teacher or something??? or are you just to dumb to know what i meant      sanchez did why couldent you???  are u a 6 year old or what?? prly like the other 13 year old kids on here that think they are growin ups.   why cant you just leave it alon and try to understand what i read.  
were pissin up a rope guys!!!

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tireman43
User
Posts: 109
Joined: 09/06
Posted: 03/30/07 12:54 PM

Lets not start this crap again. 5.9 lets try not to follow hustler around to threads and smack talk him. We are keeping an eye on stuff like this. As for the question, esanchez is right on. The letters/numbers signify each engine model. It would be like the change of the 7.3 and 6.0 powerstrokes. They changed liters, GM changed letters.  
05 Summit White CC D-Max, Hypertech III, Silverline Cool Duals, K&N, and more

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hustler_shan
Enthusiast
Posts: 430
Joined: 03/07
Posted: 04/02/07 12:20 PM

oic dident the liters change on the duramax???? when they changed there motors i think the liters changed to.  
were pissin up a rope guys!!!

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2001cummins
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Posts: 160
Joined: 10/06
Posted: 04/02/07 01:50 PM

The D-Max has always been a 6.6  
06 Dodge Cummins 2500 4x4, Edge Juice w/ Attitude w/ Hot Unlock, Predator 2018 STG 3, S@B Air Intake, CFM+ Intake Manifold, 5" Turboback Magnaflow, South Bend DD 3600 Street Comp, Top Gun Custumz leveling kit. Dyno- 495HP-962TQ, 15.20 in the 1/4 Hot only

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hustler_shan
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Posts: 430
Joined: 03/07
Posted: 04/02/07 03:27 PM

o really good to know  
were pissin up a rope guys!!!

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SteeleRice
New User
Posts: 10
Joined: 09/09
Posted: 09/14/09 10:08 PM

Does anyone know the exact difference between all of them? Also out of the four which is "the best"?  

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Edward A. Sanchez
Administrator
Posts: 2112
Joined: 07/06
Posted: 09/15/09 09:46 AM

There are probably some Duramax-specific forums that break down the changes specifically, but the major changes were between the LB7 and LLY (first and second-generation) The LBZ is basically a beefed-up LLY, and the LMM is an LBZ with emissions crap on it. Then next-gen with the SCR catalyst coming out in 2011 is designated the LML. Still a 6.6. Haven't released power figures yet. Some people are guessing 390 hp, 700-ish torque.

The LLY got a variable-vane turbo, and an improved injection system. The LBZ got beefier connecting rods, and was tuned for more power. LBZ also got a 6-speed transmission when that engine came out. In terms of the best "out-of-the-box" Duramax, there's a general consensus that the LBZ is the best one to have, although the LLY is pretty good, too. Some of the early LB7s had problems, but I've seen guys hot-rod them and get a lot of power out of them. The problem starting with the LMM (late '07+, new bodystyle) is the emissions stuff on them. This makes them harder to tune without throwing fault codes. Unless you're willing to go "full-race" and do a turbo-back straight pipe. Hope this helps.  

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mossyoak90
New User
Posts: 44
Joined: 09/09
Posted: 09/15/09 10:51 AM

So i realize that all the different models have their own specs. Is there one that stands out over the others? Like LLY vs. LBZ vs. LMM? Anybody know the specs?  

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Edward A. Sanchez
Administrator
Posts: 2112
Joined: 07/06
Posted: 09/15/09 11:17 AM

Define "specs"? Like compression ratio, peak boost, bore x stroke?  

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Hucking-Farley
New User
Posts: 2
Joined: 09/09
Posted: 09/15/09 11:27 AM

I just joined the forum, specifically to find out which engine I have. I have a 2006 HD 2500 DuraMax and I have seen different letters regarding engines and didn't know what they were. I am assuming from what you wrote that my 2006 is probably a LBZ. Is this correct? I realize your post was two years ago.
Thanks for your help.  

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Edward A. Sanchez
Administrator
Posts: 2112
Joined: 07/06
Posted: 09/15/09 11:55 AM

Could be an LLY or LBZ. If you've got the toggle switch on your shifter, and it has a blue "Duramax/Allison" badge on the door, it's probably an LBZ.  

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Hucking-Farley
New User
Posts: 2
Joined: 09/09
Posted: 09/15/09 05:04 PM

thanks for the info. I also found out that the LB7 is in all 2001 to 2003 GM diesels and on 2004 if the eigth character in the VIN is a "1" Crazy  

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