New 2011 Sierra Heavy-Duty Trucks At Texas GMC Dealer

The new 2011 GMC Sierra heavy-duty pickups are offered with a new 6.6L Duramax turbo-diesel V-8 that tops the segment in power, according to Texas GMC dealer Jerry Durant.

It is rated at 397 horsepower at 3,000 rpm and 765 lb.-ft. of torque at 1,600 rpm. The new, more powerful 6.6L Duramax is also more fuel-efficient – up to 11-percent greater fuel economy than the outgoing model – reduces NOx emissions by up to 63 percent and helps enable greater towing ratings. Sierra 3500HD can tow up to 20,000 pounds, something that many Texas GMC fans will be happy to hear.

“Segment-leading power is great, but it’s not the only thing that makes the new Duramax a winner,” said Gary Arvan, Duramax chief engineer. “We designed the engine to make that power with less fuel and fewer emissions, while also increasing its durability. Customers will immediately feel the difference in power and, over years of service, appreciate all the other attributes that make it a dependable engine for any task.”

Texas GMC Fans Ready For New Turbo-Diesel V-8

Among the 6.6L Duramax turbo diesel’s new and enhanced features are:

• Main bearing profiles changed to enhance oil film thickness
• Oil pump flow increased for more pressure at low speeds
• A revised turbocharger oil circuit for increased pressure at the turbo and faster oil delivery
• Connecting rod pin ends modified to provide increased piston support
• New, higher-strength piston design
• A new 30,000-psi piezo-actuated fuel injection system – capable of operating on ASTM grade B20 biodiesel – ensures more precise fuel delivery, improving emission performance
• An EGR cooler bypass reduces high-mileage soot deposits in the cooler and EGR circuit (pickup versions only).

The standard engine in Sierra HD trucks is the Vortec 6.0L small-block V-8, which is enhanced for 2011 with greater idle refinement. It is rated at 360 horsepower at 5,400 rpm and 380 lb.-ft. at 4,200 rpm in Sierra Denali HD, 2500HD and 3500HD pickup models. In chassis cab and box-delete models, as well as pickups with a GVWR greater than 10,000 pounds, it is rated at 322 horsepower (240 kW) at 4,400 rpm and 380 lb.-ft. at 4,200 rpm.

Approximately 90 percent of the Vortec 6.0L’s peak torque is available by only 2,000 rpm and excellent fuel economy is enabled by the engine’s low-friction OHV configuration and cam phasing, according to the Texas GMC team. The state-of-the-art small-block architecture of the Vortec 6.0L – known commonly as the “LS” family – delivers great strength, smoothness and durability.

To get behind the wheel of the new 2011 Sierra, visit leading Texas GMC dealer Jerry Durant.

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