Despite resembling the 2004-2005 LLY technology Duramax by way of its general design and building, the LBZ is a considerably improved engine. Strength was by no means actually a difficulty for earlier Duramax engines, however as horsepower and torque figures continued to climb, GM fortified the LBZ to higher deal with excessive forces. The engine block was fortified utilizing a thicker casting with extra essential bearing webbing and improved cylinder bore energy. GM additionally beefed up different essential internals, together with new and improved cast metal connecting rods.
The gas system was one other essential facet of enchancment, with the LBZ receiving a number of new gas system elements. While the common-rail gas system and high-pressure gas injectors had been a supply of subject for the older LLY engine, the system was overhauled for the LBZ. GM elevated the utmost gas strain from 23,000 psi to over 26,000 psi and up to date the Bosch gas injectors to a extra environment friendly 7-hole design.
GM additionally made some vital revisions to the turbo association to enhance reliability and effectivity. The LBZ acquired revised low-compression pistons, which decreased the possibilities of engine-damaging detonation occasions and elevated reliability general. GM additionally revised the LBZ’s turbo inlet manifold to a extra free-flowing design, reducing exhaust gasoline temperatures and delivering higher turbo responsiveness. To tie all of it collectively, GM launched a brand new 32-bit E35 engine management module, which extra successfully managed gas circulation and turbo parameters.
As a results of the entire upgrades in comparison with the earlier technology LLY Duramax, the 2006 LBZ Duramax was the most reliable, environment friendly, and best-performing turbo diesel engine that GM created to that time.