The new engine is equipped with variable valve timing that delivers 303 horsepower (223 kW) on the front-wheel-drive LaCrosse, an increase of 23 hp (17 kW) and 264 lb.-ft. (358 Nm) of torque with no loss in fuel efficiency (17 mpg city / 27 highway).

GM said that an all wheel-drive version will also be available and is not yet rated.

The 3.6L V-6 engine is more powerful than 2.4L four-cylinder engine of eAssist for its new cylinder head design that has a modified intake port design that enhances airflow to the combustion chambers.

The new integrated cylinder head/exhaust manifold design saves about 13 pounds compared to the cylinder heads and manifolds of the previous engine, while the new composite intake manifold saves about 5.5 pounds.

The heads comprised of larger diameter intake valves, and the new, longer-duration intake camshafts helps to boost up the horsepower in the engine. When the larger valves are opened for longer time, more air is pulled into the combustion chamber that enhances more powerful combustion.

The engine is made of many light-weight components that help to maintain Buick's fuel efficiency while improving its horsepower.

Tom Sutter, global V-6 chief engineer at GM, said: “The changes we’ve made to the 3.6L V-6 represent greater refinements to an already well-balanced package. We are using the latest designs, lighter-weight components and enhancements to improve the engine’s performance, efficiency and durability.”

“As a result, there is more power without sacrificing fuel economy. The more-efficient combustion also means reduced emissions.”

The direct fuel injection technology of V-6 enables more combustion efficiency, using a new fuel pump and a new, isolated fuel rail. The new fuel pump is quieter and the fuel rail reduces fuel system noise that helps LaCrosse to maintain quiet-tuned operation. The direct injection also delivers 25 percent of hydrocarbons reduced emissions, particularly on cold starts.

In addition, a light-weight structural front cover and lightweight, high-strength connecting rods bring the total weight savings to 20.5 pounds, improving fuel efficiency that enhances the feeling of driving balance.

Will the move enhance sales of GM?

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