LB7 vs. LLY vs. LBZ vs. LMM - Chevy and GMC Duramax Diesel Forum
01-04.5 LB7 Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect

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Old 02-05-2009, 09:15 PM   eBay Motors  #1 (permalink)
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LB7 vs. LLY vs. LBZ vs. LMM

ok so im sure its been posted on here before but what exactly are the changes engine wise between the lb7 and lly and so on? thx for the info was just a random thought i had!
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2002 LB7, EFI'd, HDP 5, HDP built trans, air puppy, and some 20" thumps"
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Old 02-05-2009, 09:17 PM   eBay Motors  #2 (permalink)
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lb7-300hp 520ftlb tq
lly- 310hp not sure but I think 600ft lbs tq
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SOLD 2002 LB7, CC/SB 4x4 SLT
PERFORMANCE:
EFI live, Airdog2, Edge insight cts, s&b intake, 4" TB MBRP, PPE BIV, SCIV trans, 1056 converter, banks exhaust brake, digital pyro, mechanical boost, BD Blow off valve, sleeves
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Old 02-05-2009, 09:20 PM   eBay Motors  #3 (permalink)
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i know the HP/TQ differences but was wondering what exactly GM changed between the diff engine models
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2006 LBZ, EFI'd, tranny by HDP, HDP built motor/ twins, cam, head studs, main studs, big air puppy, mahle pistons, carrillo rods, etc etc etc
2002 LB7, EFI'd, HDP 5, HDP built trans, air puppy, and some 20" thumps"
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Old 02-05-2009, 09:23 PM   eBay Motors  #4 (permalink)
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LB7
The LB7 (engine code "1") the fastest of the Duramaxs was the first introduced in 2001 and continued until 2004. The V8 engine is a 6.6 L (≈403 cu in) and it has 310 hp (261 kW) and 520 lb•ft (705 N•m) of torque. It is a 32-valve design with high-pressure common-rail direct injection and aluminum cylinder heads. The most problematic issue with the Lb7 are injectors going bad. GM issued a warranty for this and currently injectors and warrantied for 7 years/200,000 miles. Out of all the Duramaxes the Lb7 is considered to attain the best fuel mileage, helped in part to not having any emissions requirements. However starting in 2003 California and Fleet/Federal emmision vehicles engine codes YF5/NE1 came with a high-flow catylitic conveter and a EGR system. an easy way to look if your truck falls in this emmisions category is to look for a vaccuum pump or on the right bank of the engine look for a silver canister. that would be the EGR cooler. Also look in the glove compartment at the build sticker and look for the code either YF5 or NE1. and the final way is too look for the catylitic converter, however in many cases they are removed by either a aftermarket exhaust system or by straight piping the exhaust. The Duramax was on the Ward's 10 Best Engines list in 2001 and 2002.

The following trucks use the LB7:

Chevrolet Kodiak/GMC Topkick
Chevrolet Silverado/GMC Sierra HD

[edit] Specifications
Engine Description: LB7
Displacement: 6,599 cc (403 cu in)
Bore x Stroke: 4.06 in (103 mm) x 3.90 in (99 mm)
Block / Head: Cast gray iron / Cast aluminum
Aspiration: Turbocharged & Intercooled
Valvetrain: OHV 4-V
Compression: 17.5:1
Injection: Direct; Bosch High Pressure Common-rail
Power / Torque: 300 hp (220 kW) @ 3,100 rpm / 520 lb•ft (705 N•m) @ 1,800 rpm
Source: [3]

[edit] LLY
The LLY (internally called the 8GF1) (engine code "2") is a 6.6 L (6599 cc, 403 cu in) turbocharged engine which debuted in 2004 and continued until the end of 2005. It is a 32-valve design with high-pressure common-rail direct injection and aluminum cylinder heads. Output is 310 hp (231 kW) at 3100 rpm and 605 lb•ft (820 N•m) at 1800 rpm. The LLY was GM's first attempt to implement emissions requirements on their diesel trucks. To meet this goal they turned to a newly developed Garrett turbocharger with a variable geometry vane system and they installed an Exhaust Gas Recirculation valve or (EGR Valve). Learning from problems with injectors in the previous LB7 GM changed the valve covers to allow access to the injectors without having to remove the valve covers, saving significant labor costs if injector replacement became necessary, and preventing leaked fuel from entering the crankcase, causing oil dilution. Early on problems came forward from customers complaining of severe overheating, and also in some situations blown head gaskets. Initially GM denied that it was a problem, but after it was sued by a consumer group it relented and included overheating and blown head gaskets as a warranted item.

The following trucks used the LLY engine:

2006 Hummer H1 Alpha
Chevrolet Silverado/GMC Sierra HD

[edit] Specifications
Engine Code: LLY
Displacement: 6,599 cc (403 cu in)
Block / Head: Cast gray iron / Cast aluminum
Aspiration: Turbocharged & Intercooled
Valvetrain: OHV 4-V
Compression: 17.5:1
Injection: Direct; Bosch High Pressure Common-rail
Power / Torque: 310 hp (231 kW) @ 3,000 rpm / 605 lb•ft (820 N•m) @ 1,800 rpm
Head casting is 8gf1
Block casting is #22351021213
Source: [4]

[edit] 2006 LLY
The 2006 LLY (engine code "2") debuted in the beginning of 2006 and had a very short run. Mechanically it is identical to the LBZ and is mated to the new 6 speed Allison transmission however it retained the LLY designation. Its output is 310 hp (231 kW) at 3200 rpm and torque is 605 lb•ft (820 N•m) at 1600 rpm. Huge changes were made for the 06 LLY Per GM they are:

"* Cylinder block casting and machining changes strengthen the bottom of the cylinder bores to support increased power and torque

Upgraded main bearing material increases durability
Revised piston design helps lower compression ratio to 16.8:1 from 17.5:1
Piston pin bore diameter increased for increased strength
Connecting rod “ I ” section is thicker for increased strength
Cylinder heads revised to accommodate lower compression and reduced cylinder firing pressure
Maximum injection pressure increased from 23,000 psi to more than 26,000 psi
Fuel delivered via higher-pressure pump, fuel rails, distribution lines and all-new, seven-hole fuel injectors
Fuel injectors spray directly onto glow plugs, providing faster, better-quality starts and more complete cold-start combustion for reduced emissions
Improved glow plugs heat up faster through an independent controller
Revised variable-geometry turbocharger is aerodynamically more efficient to help deliver smooth and immediate response and lower emissions
Air induction system re-tuned to enhance quietness
EGR has larger cooler to bring more exhaust into the system
First application of new, 32-bit E35 controller, which adjusts and compensates for the fuel flow to bolster efficiency and reduce emissions"
The following trucks have the 06 LLY engine:

Chevrolet Silverado HD
GMC Sierra HD

[edit] Specifications
Engine Code: LLY
Displacement: 6,599 cc (403 cu in)
Bore x Stroke: 4.06 in (103 mm) x 3.90 in (99 mm)
Block / Head: Cast gray iron / Cast aluminum
Aspiration: Turbocharged & Intercooled
Valvetrain: OHV 4-V
Compression: 16.8:1
Injection: Direct; Bosch High Pressure Common-rail
Power / Torque: 310 hp (231 kW) @ 3,200 rpm / 605 lb•ft (820 N•m) @ 1,600 rpm
Source: [4]

[edit] LBZ
The LBZ (engine code "D") debuted in the later part of 2006 and continued into 2007 sold only in the "classic" body style. Its output is 365 hp (272 kW) at 3200 rpm and torque is 650 lb•ft (881 N•m) at 1600 rpm. The LBZ is mechanically identical to the 2006 LLY engine, however it has a more powerful tune loaded into the computer that allows it produce more power and torque. The LBZ is and will be known as the hot rod of diesel technology due to it being extremely powerful and able to be easily modified in contrast to the new diesels currently on the market that have stringent EPA regulations.

The following trucks have the LBZ engine:

Chevrolet Silverado HD
Chevrolet Kodiak
GMC Sierra HD
GMC TopKick
Chevy Express full-size (reduced power output mated to a 4l80E transmission)
GMC Savana full-size (reduced power output mated to a 4l80E transmission)

[edit] Specifications
Engine Code: LBZ
Displacement: 6,599 cc (403 cu in)
Bore x Stroke: 4.06 in (103 mm) x 3.90 in (99 mm)
Block / Head: Cast gray iron / Cast aluminum
Aspiration: Turbocharged & Intercooled
Valvetrain: OHV 4-V
Compression: 16.8:1
Injection: Direct; Bosch High Pressure Common-rail
Power / Torque: 365 hp (272 kW) @ 3,200 rpm / 650 lb•ft (881 N•m) @ 1,600 rpm
Source: [4]

[edit] LMM
The LMM specifications are nearly identical to the LBZ engine. It is a 6.6 L turbocharged engine and was introduced for the 2007.5 model year. Its output has seen a slight increase of 5 hp (4 kW) and 10 lb•ft (14 N•m) of torque over the LBZ. This makes it 365 hp (272 kW) at 3200 rpm and 660 ft (201 m)•ft•lbf of torque at 1600 rpm. It's mated to an Allison 1000 6-speed transmission. Engine performance curves can be found here : [1]

The LMM Duramax 6.6L V-8 has new equipment to help it meet the US EPA mandated 2007 emission standards. The new standard requires a 90-percent reduction in particulate matter (PM), compared with the previous standard, implemented in 2004, and a 50-percent reduction in oxides of nitrogen (NOx). The use of reformulated, ultra-low sulfur diesel fuel, which went on sale nationwide in the fall of 2006, is required to meet the new emissions standard and prevent damage to the emissions equipment. In addition the LMM utilizes a Diesel Particulate Filter (DPF) to trap all soot emitted from the engine. The DPF traps particulate matter aka(black smoke), when the computer senses a pressure differential between two sensors (one located before and another after the DPF) the truck enters a "regeneration" during this time the computer commands the fuel injectors to inject fuel after the cylinder has fired forcing raw fuel into the DPF where it burns up to 2000 degrees, and thereby burns up the soot collected.


[edit] Specifications
Engine Description: LMM
Displacement: 6,599 cc (403 cu in)
Bore x Stroke: 4.06 in (103 mm) x 3.90 in (99 mm)
Block / Head: Cast gray iron / Cast aluminum
Aspiration: Turbocharged & Intercooled
Valvetrain: OHV 4-V
Compression: 16.8:1
Injection: Direct; Bosch High Pressure Common Rail with CP3.3 Injection Pump
Power / Torque: 365 hp (272 kW) @ 3,200 rpm / 660 lb•ft (895 N•m) @ 1,600 rpm
Source: [5]
To meet the new emissions regulation in the US, the LMM Duramax 6.6 L V-8 engine features:

Additional combustion control, including an even more efficient variable-geometry turbocharging system, cooled (enhanced) exhaust gas recirculation (EGR) and closed crankcase ventilation to reduce nitrogen oxides (NOx)
Additional exhaust control, including oxidizing catalyst and new diesel particulate filter (DPF) to reduce soot and particulate matter
Increased-capacity cooling system
New engine control software
Use of low-ash engine oil (CJ-4)
The following trucks have or are due to have the LMM engine:

Chevrolet Silverado HD
GMC Sierra HD
Chevrolet Kodiak
GMC Topkick
Chevrolet Express/GMC Savanah

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Old 02-05-2009, 09:23 PM   eBay Motors  #5 (permalink)
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LB7's have NO emissions to worry about.

The LLY has overheating problems due to an poorly designed intake mouthpiece that would need to be modded.

Everything from LLY to present would have the EGR Blocked and the PCV re-routed, CAT removed and on the LMM the DPF removed for optimum performance.

Fully Modded without regard to warranty issues I think the LMM is the strongest contender overall.

Chris
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Old 02-05-2009, 09:25 PM   eBay Motors  #6 (permalink)
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Cool HOLY Bucket Load Of Information Nemo!!!!

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Old 02-05-2009, 09:25 PM   eBay Motors  #7 (permalink)
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lol atta boy nemo straight out of wikipedia~!!!!!!!!!!!!
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NEW 2013 Duramax LML CCSB LTZ My Build Thread
Motorops Autocal, FASS 150, diamond eye 5" TB,6" Fabtech Lift, 35x12.5 toyo MT'S,20inch Fuel Pumps, Edge insight CTS, Megawarrior&Canopy, BOSS grill,Iron Cross front and rear, Pioneer In dash, 2 JL12W3-2 subs, LED's 360degrees, Banks CAI, Curt class 5 hitch, FS airbags

SOLD 2002 LB7, CC/SB 4x4 SLT
PERFORMANCE:
EFI live, Airdog2, Edge insight cts, s&b intake, 4" TB MBRP, PPE BIV, SCIV trans, 1056 converter, banks exhaust brake, digital pyro, mechanical boost, BD Blow off valve, sleeves
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Old 02-05-2009, 09:26 PM   eBay Motors  #8 (permalink)
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I had it saved on my computer from the last time this came up about 8 months ago... knew it come in handy...

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Last edited by Nemo; 02-05-2009 at 09:28 PM.
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Old 02-05-2009, 09:27 PM   eBay Motors  #9 (permalink)
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bahahaha !
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Name: Jake Age:23 INSTAGRAM: @jakethomaspnw
NEW 2013 Duramax LML CCSB LTZ My Build Thread
Motorops Autocal, FASS 150, diamond eye 5" TB,6" Fabtech Lift, 35x12.5 toyo MT'S,20inch Fuel Pumps, Edge insight CTS, Megawarrior&Canopy, BOSS grill,Iron Cross front and rear, Pioneer In dash, 2 JL12W3-2 subs, LED's 360degrees, Banks CAI, Curt class 5 hitch, FS airbags

SOLD 2002 LB7, CC/SB 4x4 SLT
PERFORMANCE:
EFI live, Airdog2, Edge insight cts, s&b intake, 4" TB MBRP, PPE BIV, SCIV trans, 1056 converter, banks exhaust brake, digital pyro, mechanical boost, BD Blow off valve, sleeves
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Old 02-05-2009, 09:29 PM   eBay Motors  #10 (permalink)
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Basically all the extreme ultra super cool guys get the LMMs
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4094avnt, 60% over nozzles, PPE race valve & fuel pickup, AirDog 150, Fitch fuel catalyst
Inglewood SCIV w/1056 C3 oiler, EFI live, Duramaxtuner DSP 5, Edge Insight
ProFab manifold/up pipes & 3" short bridge/boost pipe
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