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New Ecotec 2.5L Engine More Efficient, Refined and Powerful


Will be standard power plant in 2013 Chevrolet Malibu, available next summer

MILFORD, Mich. – Chevrolet today revealed details of the all-new Ecotec 2.5L four-cylinder engine. More efficient, refined and powerful than its predecessor, the new power plant will be the standard engine in the 2013 Malibu.

The 2.5L is expected to deliver an estimated 190 horsepower (140 kW) and 180 lb.-ft. of torque (250 Nm) – about 12 percent more horsepower and 16 percent more torque than the current Ecotec 2.4L, while offering estimated highway fuel economy of more than 30 mpg (final fuel economy numbers are pending).

The new 2.5L will be available next summer, marking the debut of the all-new Ecotec engine family. Increased efficiency was the top development priority, achieved in part through lower engine friction. It was reduced by an average of 16 percent across the entire speed range, using new technologies such as a variable-displacement oil pump and an actively controlled thermostat. GM proprietary computational fluid dynamics (CFD) analysis techniques were used to develop an all-new combustion system with a higher compression ratio, which also helped boost efficiency.

The new combustion system features improved knock resistance and higher-flowing intake and exhaust ports in the cylinder head, which help increase efficiency, power and torque. The new Ecotec also has increased-authority cam phasing to minimize any compromise between efficiency, performance, emissions and driveability. Like the current generation of technically advanced Ecotec engines, the new 2.5L also features a high-pressure, direct-injection fuel system, dual overhead camshafts with continuously variable valve timing, electronic throttle control and pistons with jet-spray oil cooling.

It is also expected to be one of the quietest and most refined engines in the segment.

“The noise intensity is 40 percent less than our 2.4L direct-injected engine, which was named one of Ward’s 10 Best Engines,” said Mike Anderson, global chief engineer. “Engineers also tuned the 2.5L to deliver more of its torque at lower rpm, giving the Malibu a stronger feel at launch and during on-demand maneuvers, such as passing or accelerating on a freeway entrance ramp.”

Several new features give the 2.5L its segment-challenging refinement:

Balance shafts relocated from the block to a module with an integrated oil pump in the oil pan to reduce noise and vibration
A stiffer and stronger forged steel crankshaft that enables quieter and smoother engine operation at high rpm
Inverted-tooth chains for the camshaft and balance shaft drives for quieter operation
A unique, two-piece oil pan design, with an aluminum upper section to provide structural support and a stamped steel lower section to dampen overall noise
A cast aluminum bedplate with cast iron bearing cap inserts to help increase dynamic stiffness and reduce noise and vibration
Key sound attenuation enhancements such as a structural front engine cover, structural cam cover and lightweight composite acoustic intake manifold cover.

The new Malibu will be sold in nearly 100 countries on six continents. It is available in LS, LT, ECO and LTZ models in North America. Malibu will be built in multiple locations around the globe, including the Fairfax, Kan., and Detroit-Hamtramck assembly plants in the United States. Pricing will be announced later this year.

About Chevrolet

Founded in Detroit in 1911, Chevrolet celebrates its centennial as a global automotive brand with annual sales of about 4.25 million vehicles in more than 140 countries. Chevrolet provides consumers with fuel-efficient, safe and reliable vehicles that deliver high quality, expressive design, spirited performance and value. The Chevrolet portfolio includes iconic performance cars such as Corvette and Camaro; dependable, long-lasting pickups and SUVs such as Silverado and Suburban; and award-winning passenger cars and crossovers such as Sonic, Cruze, Malibu, Equinox and Traverse. Chevrolet also offers "gas-friendly solutions including Cruze Eco and Volt. Cruze Eco offers 42 mpg highway while Volt offers 35 miles of electric, gasoline-free driving and an additional 344 miles of extended gasoline range, according to EPA estimates. Most new Chevrolet models offer OnStar safety, security and convenience technologies including OnStar Hands-Free Calling, Automatic Crash Response and Stolen Vehicle Slowdown. More information regarding Chevrolet models, fuel solutions, and OnStar availability can be found at


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