Quote:
Originally Posted by ChazInMT
Funny, back in November I got into a thread discussion where a guy who was claiming that Variable Valve Timing was a way to eliminate pumping loss, I thought he was full of it, but this led me to research the whole VVT thing and really cemented for me how it is that intake systems control the power of engines.
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That's partially correct, but BMW's implementation of VVT to include both timing and variable lift means the pumping losses around the throttle plate can be essentially eliminated:
Valvetronic - Wikipedia, the free encyclopedia
Quote:
Originally Posted by Sean.Heihn
Well removing the throttle plate would,  , but then you'd be at constant WOT. |
That's how Gasoline Direct Injection (GDI) engines operate when in "diesel" mode -- the throttle plate is fully open.