2013 Gmc Sierra 1500 Engine 5.3l V8 Flex-fuel Does This Engine Change On Highways?

2014 5.3L Five-8 EcoTec3 AFM VVT DI (L83) for Chevrolet Silverado and GMC Sierra. Click to enlarge.

The 2014 GMC Sierra 1500 full-size pickup truck features a new v.3L EcoTec3 5-8 engine (before post) equipped with direct injection, cylinder deactivation (AFM) and variable valve timing to achieve EPA estimates of 16 mpg city (xiv.7 l/100 km) and 23 highway (ten.2 l/100 km) with two-wheel bulldoze or 16/22 mpg (14.7/10.7 l/100 km) with four-wheel drive.

In improver to highway fuel economy estimates that are two mpg college than a 2013 Ford V8 pickup equipped with a 5.0L Ti-VCT V-8 and 3 mpg higher than a Ram V8, Sierra's new V-8 highway fuel economic system estimates also measure higher than those of the 2013 Ford F-150 EcoBoost Five-6 (23 mpg for the Sierra, 22 mpg for the Ford EcoBoost F-150), GM noted.

2WD Pickup truck fuel economy comparisons
Model	Engine	Fuel economic system		Power (hp)	Torque (lb-ft)
		City mpg	Hwy mpg
2014 GMC Sierra	five.3L EcoTec3 V-8	16	23	355	383
2013 Ford F-150	v.0L V-viii	15	21	360	380
2013 Ford F-150	6.2L iVCT 5-8	thirteen	18	411	434
2013 Ford F-150	3.5L EcoBoost	16	22	365	420
2013 Ram 1500	v.7L HEMI 5-viii	14	xx	395	407
2013 Ram 1500	four.7L V-8	14	20	310	330
Source: GM, Ford, Model Year 2013 EPA Fuel Economic system Guide.

With an SAE-certified 355 hp (265 kW) and 383 lb-ft (519 Due north·m) of torque—increases of 40 hp and 48 lb-ft compared to the 2013 model—Sierra's new 5.3L offers towing capacity of up to 11,500 pounds.

Most GMC owners—three out of four last year—will opt for the 5.3L V-viii engine, which is an $895 choice, co-ordinate to GM.

The 5.3L EcoTec3 V-8 is ane of 3 more than efficient new engines for the Sierra; a iv.3L EcoTec3 V-half-dozen is standard. Sierra besides will be bachelor subsequently this year with a new half-dozen.2L EcoTec3 Five-8 with more power, torque and capability than the v.3L. Additional specifications for the six.2L will exist released afterward.

EcoTec3. Announced in December 2012, the new EcoTec3 engines characteristic three advanced technologies—direct injection, cylinder deactivation and continuously variable valve timing (CVVT)—to make the well-nigh of power, torque and efficiency across a broad range of operating conditions. The new engine family includes a 4.3L V6, a 5.3L V-eight and a 6.2L Five-eight, all matched with half dozen-speed transmissions.

The EcoTec3 engines use direct fuel injection to optimize combustion over a broad range of conditions. The engines as well characteristic a new cylinder-head design and a new, sculpted piston to optimize the mixing of air and fuel in the engine and the burning of the mixture to create power.

The heads features smaller combustion chambers shaped to complement the unique topography of the piston heads. The smaller sleeping accommodation size and sculpted pistons produce a pinch ratio of eleven.0:ane or college, depending on the engine, while the heads features large, rectangular intake ports with a slight twist to heighten mixture motion.

To further enhance combustion, the intake and exhaust valve positions have been switched from previous versions, and the valves are now slightly canted toward the cylinder centerline. Also, the spark plug angle has been revised and the electrode is now closer to the center of the chamber to support optimal combustion.

The pistons characteristic unique sculpted topography that was optimized via all-encompassing computer assay to precisely direct the fuel spray for better mixing and more complete combustion. The contours of the piston heads are machined after casting to ensure dimensional accuracy.

Cylinder deactivation, also known as Active Fuel Management (AFM), is now standard on all iii engines for the Silverado and Sierra 1500.

The system uses oil pressure, controlled past the powertrain control module, to deactivate the lifters on selected cylinders, closing the valves for those cylinders. Information technology deactivates four of the cylinders on the 5-8 engines and 2 cylinders on the V-6 under light load conditions—operating the engines as a V-4—and seamlessly reactivates the cylinders when the driver demands greater power. The transition takes less than twenty milliseconds and is virtually imperceptible.

Source: https://www.greencarcongress.com/2013/04/sierra-20130401.html

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