A direct-injected Ecotec 2.4L four-cylinder engine will be the third engine offered in the 2010 Buick LaCrosse luxury sedan. With a six-speed automatic transmission, the new powertrain combination is expected to deliver fuel economy of 30 mpg highway and 20 mpg city.
The Ecotec 2.4L four-cylinder joins the lineup later this year as the standard engine in the LaCrosse CX. Direct injection technology helps it deliver 182 horsepower (136 kW) and 172 lb-ft. of torque (233 N·m). Buick expects about 25% of customers will opt for 2.4L-equipped models.
The 2.4L’s injection of fuel directly into the combustion chamber enables a higher compression ratio to increase efficiency and horsepower. Cold-start emissions are reduced by up to 25% with direct injection. Engineers tuned the Ecotec 2.4L engine to deliver greater torque at lower rpm and build it smoothly toward its peak at 4,900 rpm, giving the Buick LaCrosse excellent performance in all driving conditions.
Every engine in the LaCrosse lineup is direct-injected and matched with a six speed automatic transmission. Along with the Ecotec 2.4L, a new, direct injected 3.0L V-6 is offered and a larger-displacement, more powerful 3.6L V-6 is standard on the LaCrosse CXS model.