MakeNTGreatAgain
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Direct Injection
The new EcoTec3 engines use direct fuel injection, which precisely meters fuel directly into the cylinders, to optimize combustion over a broad range of conditions. The engines also feature 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 chamber size and sculpted pistons produce a compression ratio of 11.0:1 or higher, depending on the engine, while the heads features large, rectangular intake ports with a slight twist to enhance 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 feature unique sculpted topography that was optimized via extensive computer analysis 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 – essential for precise control of mixture motion and the compression ratio.
Cylinder Deactivation
Cylinder deactivation, also known as Active Fuel Management (AFM), is now standard on all three EcoTec3 engines. The 2014 Silverado and 2014 Sierra make the most of the technology, with improved engine mounts, electronic throttle control, adaptive exhaust systems, improved aerodynamics, low-rolling resistance tires, and other technologies that help the engines operate in four-cylinder mode for longer periods of time, further increasing efficiency.
“GM pioneered cylinder deactivation technology, and we consider it a great technology for improving the efficiency of full-size trucks,” said Lee.
The system uses oil pressure, controlled by the powertrain control module, to deactivate the lifters on selected cylinders, closing the valves for those cylinders. It deactivates four of the cylinders on the V-8 engines and two 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 20 milliseconds and is virtually imperceptible.
“This is another great example of using a relatively simple mechanical system and powerful software to provide a real benefit to our customers,” said Lee
TLDR
Keep those intake valves clean!
I use Redline - the best on the market IMHO.
ahhh okay, I'll checkout redline as well
My cylinder deactivation has been deactivated through a tune, all 8 cylinders are always pumping