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GM introduces new engine for 2012 Buick LaCrosse

ABR Staff Writer Published 24 June 2011

General Motors (GM) has developed a new direct-injected 3.6L V-6 engine which will debut in the 2012 Buick LaCrosse when the model is launched later this year.

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.

The company said that fuel-economy on the 2012 LaCrosse with the new 3.6L engine stays the same at 17 mpg city / 27 mpg highway (13.8 and 8.7 liters per 100 km) as the 2.4 liter four-cylinder.

GM global V-6 chief engineer Tom Sutter said the changes the company has 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," Sutter said.

The new 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 help provide the engine's boost in horsepower and when the larger valves are opened for longer time, more air is pulled into the combustion chamber that enhances more powerful combustion.