Quote:
Originally Posted by Cd
I'm really surprised that the opening wasn't large enough. Bassjoos gets by with only the gap opening from his hood.
Is there a blockage somewhere, because I personally have run my Civic blocked with less air than that.
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I longer use the gap opening in front of the hood. That was before I installed the adjustable grill block in the bottom of the nose. These are two 10" x 3" openings, but I rarely need to have them fully open.
When designing modified cooling systems, you need to lay it out so there is a pressure differential across the radiator when the car is moving. You need a higher pressure at the inlet combined with a lower pressure at the exhaust so air will move across the radiator when the inlet is open. In the aerocivic, there is the ram air pressure of the oncoming air at the inlet and the lower pressure is created by the squirrel cage blower effect of the rotating front wheels in the wheel wells (the underside of my engine compartment is completely paneled so nothing is exhausted there).
If you are having problems moving the air across your radiator and you have the typical open bottomed engine compartment, you could add a small thin air dam strip just ahead of the engine compartment opening like the early 90's Chevrolet Camaro used to create a pressure differential across their radiator.