[chrismorse]

Hi VF,

Where did you get the gauge?
I would like to measure engine compartment air pressure with and without a duck tail in an attempt to quantify reports of engine temp reduction with the duck.
Not sure how conclusive the test will be, particularly since the car has two thermostatically controlled coolers.
Wouldn't power also be proportional to air pressure?
Perhaps a with and without duck timed 4th gear pull from 40 to 80 would be a better indicator of power differential. Not expecting much, but if the substantial majority of before and after duck reports indicate noticeable, albeit small, temp reductions, I think there will be some hp there
Dad's old stock 74 only has 150 hp ��
Chris

IIRC, the aerodynamic effect is a square of speed function and would be more substantial and measurable at 100 or 130, but I don't have anyplace to test without risking the red and blue lights.