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Old 04-25-2019, 08:50 AM
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Automotive aerodynamics

Wondering what aerodynamic effects my car is subject too, drag and frontal area, due to having an exposed engine. I know it would be better to have a slick nose but that's not the case. All exposed engine parts etc. are swirling air around. Considering a radiator cover something like the valance and rad grill like a 33 ford. I have a 3 piece 33 willys fiberglass front end that I could use.
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Old 04-25-2019, 09:54 AM
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What is it you're looking to gain?
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Old 04-25-2019, 09:55 AM
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I think you have the power to weight ratio to overcome wind resistance...
I wouldn't be bothered by the notion.
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Old 04-25-2019, 10:17 AM
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Quote:
Originally Posted by techinspector1 View Post
What is it you're looking to gain?
A lower ET. lol Just started looking into wind resistance and drag and mostly curious about it. Haven't found anything concerning an open front end like I have and the wind resistance and drag coefficient.
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Old 04-25-2019, 10:19 AM
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Originally Posted by WABOOM View Post
I think you have the power to weight ratio to overcome wind resistance...
I wouldn't be bothered by the notion.
That's why I'm asking. The front end does not appear to be aerodynamic by any means and I'm wondering how much it's hurting my ET.
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Old 04-25-2019, 11:07 AM
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I'm guessing that the aerodynamics around the butt end of your car is much more significant. there is a huge vacuum being pulled right behind you when you are hauling ***!
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Old 04-25-2019, 09:13 PM
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In terms of drag coefficient cars are about 10 times dirtier than airliners, motorcycles with their exposed wheels are far worse than automobiles.

In the real world cleaning up the front end really doesn't really have a big effect tell you get up around a hundered miles per hour.

Bogie
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Old 04-25-2019, 10:57 PM
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Quote:
Originally Posted by Fang16 View Post
That's why I'm asking. The front end does not appear to be aerodynamic by any means and I'm wondering how much it's hurting my ET.
I would think that any improvement you might make with aerodynamics would be offset by the weight of the components that you used to get there. Just my take on it. I also agree with '49FordCoupe that the rear of the car is a problem. I might try a wing on the corner of the top to break up the air or maybe install a flat piece of aluminum under the car that would stick out maybe 2-3 ft. that would prevent the air curling back and creating a suction on the rear of the car. If I were an aeronautical engineer, I could probably tell you exactly what to do. Because I'm not, all I can do is suggest things that I have seen done.
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Old 04-25-2019, 11:44 PM
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I remember watching a video posted a few years back over at YellowBullet Forums, it was a late '80's-Early '90's Ford Mustang GT, which is pretty decently aerodynamic....the owner, in a quest for light weight, had pulled all the support structure from behind the front bumper cover(which is flexible urethane). IIRC, this was a 130-140 mph 1/4 mile car(but it could have been 1/8 mile).
The video was of a dragstrip run, at about 3/4 track the bumper cover was pushing in, folding up all distorted and turned out it was costing the car something like 6 mph and over a tenth in ET.
By the time he slowed down and started back up return road, the cover returned back to its original shape and the driver wouldn't have known it was ever happening if he hadn't been told of it and shown the video so he could see it.

On the rear I'd think you'll want a shelf style spoiler like the Pro Stocks and Pro Mods and Top Sportsman/No Prep/Grudge type cars use to get the drag off the rear of the vehicle.

Personally, I'd want the '33 Willy's front panels on there, at least the grill shell and headlight/fenders assembly ad it is the most interesting and distinctive thing about the body on those years IMO. Otherwise, it's just another small sedan delivery everyone is going to ask you if it is aa Anglia or Thames or PreFect.
Don't forget you'll want a chin spoiler to keep as much air out from under the car as possible and keep the front from lifting.
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Old 04-26-2019, 06:37 AM
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bonneville cars

Drag rules ? ? at Bonneville last summer we spent a lot of time in the pits looking at cars. some of the cars running in the lower smaller engine classes had aero front ends as allowed by the rules. One Guy who was known for running Ford Y blocks switched from a Ford ranger Mini truck to a Chevy S 10 which was a lot more aero and went faster. mustang 5.0 car switched to a Capri rear bubble hatch with the curved glass. When I lived in Calif. a neighbor built about 20 circle track cars a year. another neighbor did "government " project wing designs for him , tested in the NASA wind tunnel.
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Old 04-26-2019, 10:28 AM
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Quote:
Originally Posted by Fang16 View Post

A lower ET.
Move and loose more weight.

You have a open design use it.

I would relocate the radiatior(and battery) to the rear having it pulling air in from the rear wheel wells(enclosed shroud) and out the back. Have puller fans pushing heat out onto that tailgaters hood.

Allows air to rush right through that grill and over the motor.
Moves some weight.
Lets you direct air out the back eliminating that bubble and some drag.
Allows for some frontend space.
Freaks people out wondering where your radiatior is.
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Old 04-26-2019, 01:33 PM
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Quote:
Originally Posted by cerial View Post
Move and loose more weight.

You have a open design use it.

I would relocate the radiatior(and battery) to the rear having it pulling air in from the rear wheel wells(enclosed shroud) and out the back. Have puller fans pushing heat out onto that tailgaters hood.

Allows air to rush right through that grill and over the motor.
Moves some weight.
Lets you direct air out the back eliminating that bubble and some drag.
Allows for some frontend space.
Freaks people out wondering where your radiatior is.
That's an interesting idea that I will be looking into.
Not sure what you mean by "tailgaters hood" please elaborate.
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Old 04-26-2019, 02:59 PM
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When the fans kick on the heat is sent right out the back. If you have some on your butt at a light your going to send that heat over there hood.

Hide the fans under some loovers or leave them exposed.
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Old 05-02-2019, 11:44 AM
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wind

love when that chase car is getting all my heat at the dragstrip.
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