Chevy 3.6L Engine V6 LLT
The Chevy 3.6L engine V6 LLT is an engine produced by General Motors for use in a wide variety of mid- and full-size vehicles. Part of GM’s High Feature V6 VVT engine family, the LLT was among the first within the automaker to acquire direct injection. The engine was first superseded by the more efficient and powerful LFX and then the next-generation High Feature V6 LGX. The Lambda-based crossovers, the first-generation Chevrolet Traverse, Buick Enclave, and GMC Acadia, were the last vehicles to be equipped with the LLT unit.
The 3.6L V6 VVT DI (LLT) is part of GM’s global family of high-feature V6 engines. Also upon its release, it applied the most advanced automotive engine technology available. In addition from state-of-the-art casting processes and full four-cam phasing to ultra-fast data processing and torque-based engine management.
The 3.6L LLT delivers a market-leading balance of good specific output, high torque over a broad rpm band, fuel economy. As well as low emissions, and first-rate noise, vibration and harshness control, with exclusive durability-enhancing features and very low maintenance.
Aluminum Engine Block & Cylinder Heads
The Chevy 3.6L engine block and cylinder heads are cast from A319 aluminum alloy. This aluminum-intensive construction means less weight and greater efficiency than conventional cast-iron engines. And less weight translates to improved vehicle fuel economy. The sand-mold-cast block features strong cast-in iron bore liners, six-bolt main caps, and inter-bay breather vents.
Rotating Assembly with Oil-Spray Cooled Pistons
The crankshaft is manufactured from forged steel and the connecting rods are a sinter forging, as used on other Chevy 3.6L Engine V6 VVT. The pistons are made of lightweight cast aluminum and feature a friction-reducing polymer coating on the skirts. As well as fully floating wrist pins, which also help reduce friction. Less weight in the pistons means less reciprocating mass in the engine, which in turn means less inertia and greater operating efficiency.
The V6 VVT Chevy 3.6L Engine family was developed with pressure-actuated oil squirters in all applications. The jets reduce piston temperature, which in turn allows the engine to produce more power without reducing long-term durability.
Direct injection moves the point where fuel feeds into an engine closer to the point where it ignites, enabling greater combustion efficiency. It fosters a more complete burn of the fuel in the air-fuel mixture, and it operates at a lower temperature than conventional port injection. That allows the mixture to be leaner (less fuel and more air). So less fuel is required to produce the equivalent horsepower of a conventional, port injection fuel system. Direct injection also delivers reduced emissions, particularly cold-start emissions, which are cut by about 25 percent.
High-Pressure Engine-Driven Fuel Pump
An engine-driven high-pressure pump supplies fuel to the injectors to overcome the higher pressures inside the combustion chamber. As well as supply the multiple injection points of the direct injection nozzles. This variable-pressure high-pressure pump feeds a high-strength stainless steel fuel rail attached to the injectors.
Dual Overhead Cams with Four Valves per Cylinder and Silent Cam Drive
Four-valves-per-cylinder with inverted-tooth chain cam drive contributes to the smoothness and high output of the LFX. The Chevy 3.6L Engine incorporates a timing chain with an inverted tooth design. These smaller links engage at a lower impact speed, which decreases the noise generated. In conjunction with the smaller pitch chain, the number of teeth on the sprockets are increased. Which increases the meshing frequency and further reduces noise and vibration.
Variable Valve Timing (VVT)
Variable valve timing, or cam phasing, helps the Chevy 3.6L Engine V6 deliver optimal performance and efficiency, and reduced emissions. Also it allows linear delivery of torque, with near-peak levels over a broad rpm range. Furthermore high specific output (horsepower per liter of displacement) without sacrificing overall engine response, or driveability.
Composite Intake Manifold and Fully Isolated Composite Camshaft Covers
The upper intake manifold for the Chevy 3.6L Engine V6 is made from composite material and provides mass savings over an aluminum manifold. Furthermore with a carefully designed structure that helps ensure quiet engine operation.
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