Direct injection also delivers reduced emissions, particularly cold-start emissions, which are cut by about 25 percent. 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. 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. Direct Injection: direct injection moves the point where fuel feeds into an engine closer to the point where it ignites, enabling greater combustion efficiency.The exhaust manifold is incorporated with the cylinder head, which saves weight, reduces complexity and helps promote a quicker light off of the catalytic converter, which further helps reduce emissions. By using larger valves and holding them open longer, more of the air is pulled into the combustion chamber, for a more powerful combustion. Larger-diameter intake valves are used in the heads and work in conjunction with new, longer-duration intake camshafts to provide the engine’s boost in horsepower. Integrated Cylinder Heads/Exhaust Manifolds: the LFX’s new cylinder head design has a revised intake port design that enhances airflow to the combustion chambers.The jets reduce piston temperature, which in turn allows the engine to produce more power without reducing long-term durability. The V6 VVT engine family was developed with pressure-actuated oil squirters in all applications. Rotating Assembly with Oil-Spray Cooled Pistons: the crankshaft is manufactured from forged steel, while the connecting rods are made of powdered metal that features a higher ratio of copper, which makes them stronger and enables them to be lighter.A cast aluminum oil pan is stiffened to improve powertrain rigidity and reduce vehicle vibration. The sand-mold-cast block features strong cast-in iron bore liners, six-bolt main caps, and inter-bay breather vents. This aluminum-intensive construction means less weight and greater efficiency than conventional cast-iron engines – and less weight translates to improved vehicle fuel economy. Aluminum Engine Block & Integral Oil Pan: the 3.6L V6 VVT’s engine block is cast from A319 aluminum alloy.It now uses new, lighter-weight components and enhancements designed to improve performance, efficiency, and durability. The engine further refines an already well-balanced powerplant. Camshaft cap and throttle body design enhancements.Stronger and lighter-weight connecting rods.Structural front cover and cylinder block enhancements.Improved intake port design and larger intake valves within the cylinder heads.New cylinder head design with integrated exhaust manifold.Compared to the LLT it replaces, the LFX is lighter and more powerful, and also features the following features: The 3.6 liter V6 LFX engine is GM’s new high-feature V6 engine, replacing the 3.6L direct-injected six-cylinder engine (code LLT).

Cts 3 6 engine timing diagram