[Mr. Wyndham]

Originally Posted by Martinjlm

Here's how it works.....

I'm confused....mostly because that's the exact same concept as AFM, right now - except at the lifters. Because the engines are OHV/pushrod.

So does this mean the new engines will be DOHC? There's something not adding up.


EDIT: Found something here...sounds more like new software management, rather than hardware in the case of GM's V8s...http://www.motortrend.com/news/when-...chnologue/amp/

Current AFM-equipped V8s have just two choices...run on all 8 cylinders, or just 4...and the switchover can be jarring at times. GM's done a pretty good job of ironing out the transition, but it's still there. This new technology allows the same concept to be applied to all 8 cylinders, and manages each one individually depending on the torque demands during that single 90º rotation. The goal, is to allow the throttle to be most open with the fewest cylinders, resulting in dramatically reduced pumping losses.

Apparently, a prototype Yukon 5.3L ran the EPA city cycle on just 2.4 cylinders (average over time), and up to 4 (average) on the highway cycle. A steady cruise at 70 mph required as much as 7 cylinders.

What this tech does is maximize the flexibility of the traditional AFM system.

So my guess is, in a pushrod engine - they'll still use the hydraulic AFM lifters.