LB7. RPO LB7 (engine code “1”) was first introduced in 2001 and continued until early-2004. It is a 32-valve design with high-pressure common-rail direct injection and an experimental composite design cylinder head.
What year LB7 is the best?
LB7: 2001 – 2004
It’s still highly popular in the used market. Other than LB7 engines sold in California, these engines didn’t include any emission control devices. The lack of these extra emissions parts made the engines highly reliable.
Is a lly or LB7 better?
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 Duramax a good engine?
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 years was the LB7 used? – Related Questions
What is so special about the LB7 Duramax?
The internal components on the LB7 were designed to be lightweight, yet extremely durable. Cast in 4340, the crankshaft was treated with a process to increase durability under extreme heat. Lightweight cast – aluminum pistons (among the lightest ever put into a Duramax engine).
How long will LB7 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).
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.
Does LB7 have head gasket problems?
So, blown head gaskets were a bit of a surprise to the owner, but it just goes to show that their failure can happen in any LB7, regardless of mileage, use, and/or abuse.
How much HP can a LB7 hold?
16.8:1 on LBZ, LMM, and LML mills), the LB7 and LLY engines naturally see higher peak cylinder pressures (elevated torque levels). Couple that with a weaker connecting rod and you can draw a pretty strong conclusion as to why the LB7 rods fail in the 550 to 600 hp (1,100 to 1,200 lb-ft.) range.
How much HP can a LB7 make?
Producing 235-300 horsepower and 500-520 lb/ft of torque, the LB7 Duramax was a beast. It was a huge success that ultimately led to the creation of other Duramax engines including the LBZ, LMM, LML, and L5P.
How long should I let my LB7 warm up?
As a general rule of thumb, if it is below zero degrees Fahrenheit, you should allow your engine up to seven minutes to warm up. If the temperature is between zero and fifty degrees, the warm-up period should be three to five minutes. Over fifty degrees will only require one or two minutes to warm up.
How long does a LB7 CP3 last?
The Bosch CP3, used on the ’01-to-’10 Duramax and ’03-to-current Cummins engines, is known to last 250,000 miles or more before needing to be replaced.
Does an LB7 need a lift pump?
Even if you have a bone stock LB7 or a highly modified LML, a lift pump can help the injection pump focus on its main job, and when you add increased filtration and air separation into the mix, you can even extend the life of your injectors and injection pump.
How can I make my LB7 faster?
If you want to improve performance, an aftermarket cold air intake can provide pretty solid gains for a cheap price. Aftermarket cold air intakes like the LB7 Duramax Banks Power Ram Air System provide the engine with cooler, denser air which results in more power.
Does LB7 have glow plugs?
If the eighth digit of the VIN is a “1” then you have an LB7 and these dual coil glow plugs will fit. These Duramax LB7 glow plugs will NOT fit 2004.5 and later Duramax. If you need plugs for a vehicle 2006 or later please see related items below.
What injectors are best for LB7?
From our experience in the diesel repair and performance industry we feel that the best injector you can purchase for your LB7 Duramax is the Genuine Bosch Injector.