Quote:
Originally Posted by MetroMPG
Driving efficiently when nobody's looking? C'mon! :P
Cold air is good for power. The idea behind a warm air intake is to intentionally DEpower the engine, which requires a wider throttle opening to do the same amount of work. A wider throttle opening means reduced pumping losses. One of several reasons diesel engines are more efficient is because they have no throttle plate.
A grille block is just that: closing up some of the front of the vehicle ahead of the radiator. A significant amount of the total aero drag of a vehicle is airflow through the radiator. If you don't NEED the airflow, closing off that opening will help. Don't melt your engine though.
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Cold air is good for power cause air expands as it gets hotter. When it is cold the volume/density changes and you get more air/oxygen in the same amount of space.