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Old 04-14-2008, 04:27 PM   #1 (permalink)
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Basic aero question (can dents hurt MPG?)

Does anyone know where I can find the drag .cd of my 1992 civic 4dr?

I also was wondering how much .cd damage I'm doing driving around with dents in the hood and a rip (somewhat small-ish) in the front fascia, and if its affecting my mileage. I can take some pics if that would help. I'm just wondering if it would be worth it to replace the fascia and the hood.

I was also thinking about sealing up seams with packing tape, such as between the headlight and the blinker, ect. Has anyone done that before and seen results?

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Old 04-14-2008, 04:54 PM   #2 (permalink)
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Pictures would help. However, small dents really won't hurt aero that much. The rip is probably minimal as well unless your bumper is now hanging down.
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Old 04-14-2008, 04:59 PM   #3 (permalink)
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The coupe has a .32 .Cd according to Road & Track.
You have a longer roof line so the airflow might stick better.

I'd say it is safe to guess at around .32 -.33 range.

As far as the dents, how large are they ?
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Old 04-14-2008, 06:49 PM   #4 (permalink)
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Very manly color, no?





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Old 04-14-2008, 07:03 PM   #5 (permalink)
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Those are little, and where they are they aren't really affecting your airflow. If you need to, you can probably ignore them. The steel is thin, though: if there's any bare metal showing, that's a welcome mat to car cancer.
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Old 04-14-2008, 08:59 PM   #6 (permalink)
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OK good, thanks... I know all about the cancer, I'm in Buffalo NY, just about the capital of salt use, the car has a couple of "spots" (read: rot holes) already.

Also thanks for the .Cd numbers

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