The all-new 6.6L gasoline V8 engine that is going into the 2020 Chevy Silverado HD will not utilize active or dynamic cylinder deactivation, according to a recent report at GM Authority.
The report also states that the new direct-injected heavy duty V8 engine will not offer automatic engine start/stop either.
GM’s Active Fuel Management (AFM) is an older cylinder deactivation technology that lets the truck run in V4 mode under light loads to save a little fuel. The newer Dynamic Fuel Management (DFM) is a more sophisticated system that can skip cylinder firing order in up to 17 different ways.
The new 6.6L V8 (code L8T) is rated at 401 hp @ 5,200 rpm and 464 lb-ft of torque @ 4,000 rpm. As of now, we know that this gas engine replaces the 6.0L Vortec V8 in the Chevy and GMC 2500 and 3500 series trucks. We do not know yet whether this gas engine will also find its way into the Chevy 4500, 5500, and 6500 trucks.
Here is a more in-depth look at the new L8T engine.