2010 Equinox to offer DI for class-leading fuel economy

  • 23-Dec-2008 02:16 EST
The 2.4-L engine in the 2010 Equinox is expected to deliver an estimated 30 mpg in highway driving.

When the Chevrolet crossover debuts next summer, it will be offered with two new direct-injected (DI) engines—a 2.4-L four-cylinder and a 3.0-L V6—using variable valve timing to optimize power and fuel efficiency and reduce emissions. The 2.4-L is expected to deliver an estimated 30 mpg in highway driving, though EPA certification is pend­ing, placing the Equinox at the top of its segment in highway mileage.

The Equinox, along with new DI vehicles from General Motors including the 2010 Cadillac SRX and 2010 Buick LaCrosse, will debut in January at the North American International Auto Show in Detroit.

GM first introduced direct injection in North America in the 2007 Saturn Sky Red Line and the Pontiac Solstice GXP, said Tom Stephens, Executive Vice President, GM Global Powertrain and Global Quality. By 2010, GM will have eight DI engines in 38 vehicle models, covering 10% of its global volume.

The 2.4-L engine will deliver an estimated 180 hp (134 kW) at 6700 rpm and 172 lb·ft (233 N·m) at 4900 rpm. It uses technology from GM’s other four-cylinder direct-injection applications, but unique features for the Equinox include an 11.4:1 compression ratio, slightly dished pistons that increase combustion efficiency, and application-specific flow rates for the injectors.

The 3.0-L engine is a variant of GM’s family of high-feature DOHC V6 engines, which includes the 3.6 L in the Cadillac CTS. It will be rated at an estimated 255 hp (190 kW) and 214 lb·ft (290 N·m).

GM says it benchmarked the best fuel-system and noise-attenuation products to provide customers with quiet operation. To reduce the noise from high-pressure injection pulses, the V6, for example, features a rubber-isolated fuel rail that eliminates metal-to-metal contact.

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