How fast were you going and how big was the scoop? The car has to be going a high rate of speed to create the high-pressure area. And, if the cfm of the scoop is much larger than the max cfm of the carb, you wouldn't see much movement. This is why many modern cars have the intake up front behind the headlights or leading edge of the hood.
On the flip-side warm air provides better atomization and better gas mileage, if that's your goal...
