The LB7 was the simplest in terms of emissions controls, while the LLY came with the largest turbocharger ever offered. The LBZ packed a host of improvements, including considerably more power, and the LMM was nearly a mirror image of it aside from its use of a diesel particulate filter.
Is the LB7 the fastest Duramax?
The LB7 Duramax diesel is a direct-injected, turbocharged, intercooled, four-valve-per-cylinder V-8 that produces 300 hp and 560 lb-ft of torque. Starting from a blank sheet of paper, the 6.6L Duramax is recognized to date as the fastest diesel development program in the world.
Why is the LB7 the best Duramax?
LB7 Duramax Reliability
The LB7 is a great engine, when it is stock. The block and internals are plenty capable of lasting 350,000+ miles. Most of the injector issues and head gasket faults should be fixed in these trucks now given their age.
What is the difference between the LB7 LLY or LBZ?
The LBZ Duramax V-8 engine is more powerful than the LB7 and LLY with its 605 lb. ft torque at 1600 rpm and 310 bhp at 3000 rpm. LLY has two variants; one with a power output of 310 bhp at 3000 rpm and another 250 bhp at 3200 rpm. LB7 comes with a power output of 300 bhp at 3200 rpm.
Is LB7 or lly better? – Related Questions
Can I swap LB7 and lly?
3. Can I keep my 5-speed transmission? —Yes, you can keep your existing LB7 transmission when swapping to a 2004.5-2005 LLY.
What year Duramax is most reliable?
Some engines are more popular than others. For example, the pre-emissions Duramax engines made between 2001 and 2007 are highly sought-after for superior reliability.
How do you tell if my Duramax is LLY or LBZ?
The Duramax engine has evolved from the original LB7 series to include the LLY, LBZ, LMM, LML/LGH, and now the L5P series. The simplest way to verify which series Duramax you have is interpreting the VIN# of the truck. With some exceptions, the 8th digit is the engine ID and it will either be a 1, 2, D, 6, 8, L, or Y.
What’s better LLY or LBZ?
Mechanically, the LBZ used the same Duramax parts as the LLY. However, the LBZ generated 360 horsepower over the LLY’s 310 horsepower. Torque increased as well, going from 605 pound-feet with the LLY to 650 with the LBZ.
What is so special about the LBZ Duramax?
The GM 6.6L Duramax engine was completely redesigned to enhance overall performance and reliability for 2006. The LBZ engine tuning resulted in a significant increase in horsepower and torque, with the power levels getting a bump to 360 hp and 650 lb-ft of torque, up from 310 hp and 605 lb-ft of torque in the LLY.
What is the most desirable Duramax engine?
LBZ: 2006-2007
Perhaps the shortest lived of the 6.6’s, the LBZ Duramax is one of the most desirable amongst diesel enthusiasts today. The LBZ has the best performance and horsepower potential with bolt-on mods and was paired with a stronger Allison transmission than found in the LLY Duramax.
What Duramax gets the best mpg?
The 2021 Sierra HD series includes a diesel engine at the 2500 level that’s capable of generating 445 horsepower and 910 pound-feet of torque. This Duramax 6.6-liter V-8 gets 17 to 19 mpg on the highway.
What problems do LB7 Duramax have?
The LB7 Duramax is more prone to head gasket failures than future generations of the Duramax engine. Despite this, head gasket failure usually doesn’t occur until over 100,000 miles, so it’s not nearly as common as it is in 6.0L Powerstroke engines. LB7 Duramax head gasket problems can occur for a couple of reasons.
Is the LLY Duramax a good motor?
While previous injector issues were laid to rest with the LLY, the common-rail injection system still had a few minor quirks, along with the injection system still being void of a factory lift pump. But even though it tends to be viewed as the least desirable in the Duramax lineage, the LLY was a very solid engine.
Does the lly have a CP3?
The LLY Sportzman is built out of a brand new LBZ based CP3 pump. It is internally modified to support high rpm applications while delivering maximum fuel flow with out modifying the cam. This pump supports 650hp depending on injector size and health.
How much HP can an LLY make?
It’s not uncommon to find a slight bend in most (if not all) connecting rods upon teardown of an LLY powered truck churning out 550 to 600-rwhp. Good tuning and a large single turbo setup can be your best friend if you’re trying to make big power on a stock bottom-end Duramax.
How long will a LLY Duramax last?
Overall, a properly cared-for Duramax engine should last over 300,000 miles. However, consumers report having Duramax’s lasting in the 500,000-mile range!
How do you get 30 mpg on a LLY Duramax?
It may be possible to upgrade some of your diesel truck parts for better performance and fuel economy. Let’s take a look at how to get 30+ MPG with a Duramax.
Some popular methods include:
- Tuning.
- Removing the tailgate.
- Installing a bed cover.
- Not using your AC.
- Upgrading your air intake.
- Installing a new fuel filter.
When did they stop making LLY Duramax?
LLY. The LLY (internally called the 8GF1) (engine code “2”) is a 6.6 L; 403.9 cu in (6,619 cc) turbocharged engine which debuted in mid-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.
How much does it cost to replace injectors in a LLY Duramax?
The total cost to have a mechanic replace 8 injectors on an LLY Duramax can range from $3500 – $4500 CAD, depending on what other work is performed at the same time. The good news is LLY injectors are located outside the valve covers so the task is considerably easier and cheaper than on prior LB7 models.
How many miles do Duramax injectors last?
The biggest issue with ’01-to-’04 and 1/2 LB7 engines is their fuel injectors’ propensity to fail, typically before an engine reaches 100,000 miles. When an LB7 injector fails, it can dump an enormous amount of excess fuel into the engine, often at very low speeds (such as idle, for example).