Its gratifying to see that I'm not the only one who thinks along similar lines
From the other thread, I was getting the impression that what was being put forward was that the air was being pressurised before
it passed through the
(which I couldn't follow).
I view it this way; I'm sitting with my favourite (but all too rare drink - a McDonalds Strawberry milkshake), I need to get the substance from the cup along the straw into my mouth - I don't pressurise the contents of the cup to push the milkshake along the straw, I create a lower-pressure area (almost vacuum if the milkshake is thick enough) in my mouth, than what the milkshake is subject to in the cup, and there then exists a driving force for the milkshake to defy gravity.
That is how I see the inlet aspect of the
working - it pulls more air in as more exhaust gases leave - its not instantaneous (that's why
lag exists), but its pretty much correlated once in motion.
I do accept there is then positive pressure on the gas once it passes the
, but unless the inlet has a direct feed and the vehicle is already in motion, it will only be the negative pressure which pulls the air into the inlet.
Thanks for the input, its always good to air our views.