Originally Posted By: emmett442
As I understand it, there is no throttle valve: like a diesel. That way, since there is no air restriction, whichever cylinders are selected to fire are operating at peak efficiency every time they fire = less emissions and better fuel efficiency.
If that's correct, I suppose that means either they've done away with all vacuum operated equipment or they're going to use a vacuum pump to retain it.
As far as complication, it seems to me they'd be able to eliminate the throttle body and it's associated management. Not sure EXACTLY how this is implemented, but there's a chance that this could actually be a simpler (mechanically) system than what we currently have!
My BMW is like that. Does not have a throttle body. For vacuum, there are two pumps in the cylinder head. They supply vacuum to the brake booster etc, and run the crankcase at a vacuum for PCV.
As I understand it, there is no throttle valve: like a diesel. That way, since there is no air restriction, whichever cylinders are selected to fire are operating at peak efficiency every time they fire = less emissions and better fuel efficiency.
If that's correct, I suppose that means either they've done away with all vacuum operated equipment or they're going to use a vacuum pump to retain it.
As far as complication, it seems to me they'd be able to eliminate the throttle body and it's associated management. Not sure EXACTLY how this is implemented, but there's a chance that this could actually be a simpler (mechanically) system than what we currently have!
My BMW is like that. Does not have a throttle body. For vacuum, there are two pumps in the cylinder head. They supply vacuum to the brake booster etc, and run the crankcase at a vacuum for PCV.