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Old 04-06-2008, 06:42 PM
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Where to find: Coefficent of drag values for Classic cars

Hey guys,
Its beena while since i have been on these forums. I have been googling and wikiipediaing like crazy.
I need curb weight and coefficent od drag values. Curb weight numbers aren't too difficult to find, but the coefficent of drag is nearly impossible to find.

Do you know somewhere i can look?
I am looking at chevrolet cars. 150'2, 210, bel airs. Fleetlines, similar body styles. more of the "cruiser" type cars.
If you know a site, or book or magazine that would help. I would love you for it
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Old 04-06-2008, 06:55 PM
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Doubt that you are going to find that info, considering they probably didn't even know what that is back then..........Highly unlikely any testing was done......

Next question is.....WHY?
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Old 04-06-2008, 10:27 PM
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I agree with poncho62. You might be able to find the coefficent of drag of a brick somewhere though. That would be pretty close>
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Old 04-06-2008, 10:47 PM
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Hardy har Home Brew, all you have to do is take one look at the grill patterns.

A brick????? More like a block wall. It was style back then, not drag coefficient.

Good luck RR, I think you might need to do a little interpolation..........

Honda accord divided by 25%, square-root of 15......carry the 1.....bingo
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Old 04-06-2008, 11:09 PM
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Im sure the numbers are out there. Im willing to bet that some has done some CFD work and needed these values.

Ill keep bumping this until i find what i need.
Not all these cars are like a brick. Look at the chevys I mentioned, they are pretty round in the front
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Old 04-06-2008, 11:58 PM
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Quote:
Originally Posted by Riot Racing
Not all these cars are like a brick. Look at the chevys I mentioned, they are pretty round in the front
OK then a rounded brick.

Joki9ng aside, if you do find some info let us know as I would be interested.
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Old 04-07-2008, 08:07 AM
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Here is some stuff I found a while back. Lots of bricks and concrete blocks here. haha.

Just a guess I say a Tri 5 is about .45 to .50. Amazing that you could get 18-20 mpg at 70 with a 3 spd and 3.55 gears and a 265 2bl.

http://www.mayfco.com/tbls.htm
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Old 04-07-2008, 10:07 AM
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I think that bentwings has a good guess as the VW van and Range Rover as well as the GMC's are all sitting around .45 in those charts. But are those charts correct? If someone could match a few of the figures published by the auto makers recently then you may be able to get pretty close.
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Old 04-07-2008, 02:44 PM
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with my sun visor, eggcrate grill, and 5 inches or so of lift, i recken my drag coefficient is roughly the same as an open parachute
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Old 04-08-2008, 12:07 AM
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Quote:
Originally Posted by bentwings
Here is some stuff I found a while back. Lots of bricks and concrete blocks here. haha.

Just a guess I say a Tri 5 is about .45 to .50. Amazing that you could get 18-20 mpg at 70 with a 3 spd and 3.55 gears and a 265 2bl.

http://www.mayfco.com/tbls.htm
I have seen this company before. They are very limited to the values they publish.

Why is my thread being polluted with the same killed joke?
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Old 04-08-2008, 12:49 PM
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maybe because asking for this information is roughly akin to wanting to know what Paris Hilton's IQ is.

I mean, we all know she is really, really stupid right? isn't that enough??? Does one really need to know if she can be classified as a moron, an Imbecile, or an Idiot?? I think not. Brick wall, parachute, any way you slice it, you might as well find the drag coefficient of a school bus.
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Old 04-08-2008, 03:39 PM
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Well here you are a fairly simple roll down test one can do with his own car..Might be useful if one is looking at how different mods affect airflow and drag..

http://physics.technion.ac.il/~rutma...own%20test.pdf

Opens as A PDF file..

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Old 04-08-2008, 07:05 PM
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Pretty interesting stuff. As long as you can keep the road variables in control you should be in business.

I drive my dually at 55 down from 58-60 and run the tires up to 80 in the front and 75 in the rear. I'm up to a steady 20 mpg on the last of the winter fuel up from 16-17 over the winter. My Excel spread sheet shows that even though the tires wear more in the center now the increase in mpg more than pays for the wear on the tires.
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Old 04-09-2008, 12:30 AM
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Quote:
Originally Posted by bullheimer
maybe because asking for this information is roughly akin to wanting to know what Paris Hilton's IQ is.

I mean, we all know she is really, really stupid right? isn't that enough??? Does one really need to know if she can be classified as a moron, an Imbecile, or an Idiot?? I think not. Brick wall, parachute, any way you slice it, you might as well find the drag coefficient of a school bus.
Ignorance is Bliss my friend
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Old 04-09-2008, 01:08 AM
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Hijack1

here is a close second.

Return to reality:

Any body find the drag coefficient of today's funnycar??
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