Towing with a 2022 Ford 150 3.5 EcoBoost
Hello everyone How is everyone's experience towing with this truck, as I am considering ordering the truck. Specs: GCWR 17,500, Max Payload 2,190 Max towing 12,300 Also considering ordering/to...
Forum Discussion
BenK wrote:
On a gasser, it is just pumping losses from having to turn (crank) the whole drive train faster without fuel.
Therefore, bigger gasser engines has more mass to 'crank', will have more engine braking.
Of course, the diff & tranny gears plays. As lower gears (higher numeric) will try to force the engine crank to spin faster (the rotating mass is forced to turn faster)
A tiny displacement ECO will not have that much mass to force and will not provide as much resistance as a larger displacement.
This is not how engine braking works. It's not as good as a diesel exhaust brake but it's not simply more internal friction from the engine turning faster.
The term "engine braking" refers to the braking effect that occurs in gasoline engines when the accelerator pedal is released. This causes fuel injection to cease and the throttle valve to close almost completely. The restriction causes a strong manifold vacuum which the cylinders have to work against, sapping much of the potential energy out of the system over time and producing the majority of the engine-braking effect. This vacuum manifold effect can often be amplified by a down-shift, which induces a faster spinning drivechain to engage with the engine. While some of the braking force is produced due to friction in the drive train, this is negligible compared to the effect from the manifold vacuum caused by the air-flow restriction.
