Aerodynamics

[1979ratrod]

Like this?

^Somebody was pondering that idea. I remember seeing a thread about it but I don't remember any keywords to find it.
Think you could get away with a rear diffuser too?

just make this the other day. i doubt it do's much but i like the look

 

[pontiacgp]

A wind splitter should be close to the ground with a rub strip on the bottom that is actually put to use. To make it work you need skirts along the sides of the car so the air will travel from the front to the back and keep it a low pressure area. A splitter is most helpful in corners to keep pressure on the front tires. The problem with splitters on a street car is parking perpendicular to the sidewalk or a concrete parking barrier

 

[1979ratrod]

A wind splitter should be close to the ground with a rub strip on the bottom that is actually put to use. To make it work you need skirts along the sides of the car so the air will travel from the front to the back and keep it a low pressure area. A splitter is most helpful in corners to keep pressure on the front tires. The problem with splitters on a street car is parking perpendicular to the sidewalk or a concrete parking barrier

at some point i want to add sides but the car is getting lowered more over winter

 

[pontiacgp]

I was thinking about sides as well, attached to the frame so they are not too visable. What material were you thinking of using for the sides

 

[1979ratrod]

just steel like some simple side skirts that are welded onto the body and blended into it

 

[pontiacgp]

I'm worried about speed bumps so I was thinking of some thin stiff rubber

 

[1979ratrod]

not a bad idea. it wouldnt lower it that much

 

[pontiacgp]

I have scraped my headers on some higher than most speed bumps and they are headers that don't hang low

 

[oldtinsmith]

A wind splitter should be close to the ground with a rub strip on the bottom that is actually put to use. To make it work you need skirts along the sides of the car so the air will travel from the front to the back and keep it a low pressure area. A splitter is most helpful in corners to keep pressure on the front tires. The problem with splitters on a street car is parking perpendicular to the sidewalk or a concrete parking barrier

I remembered reading in Fred Puhn's book about side skirts [a sucker car (a fan pumps air from under a car),a venturi car (air moving through ducts on the sides of the car and creates low pressure), and a sucker car (low pressure generated at the back of the car as it moves through the air creates low pressure under the body)]. The rear sucker car is the easiest to build because it can be adapted to almost any car. A front skirt (air dam) restricts air from entering under the car. The side skirts extend from the front skirt and continue down the sides to the back of the car. The rear is left open so the low pressure created behind the car will further reduce the underside pressure.
Now that sucker will be glued to the course !!!

Doug

 

[online170]

I can deflect the air around my front wheels but I have to figure out what to do with the centers section where my exhaust runs and around the rear axle. The way the tank is shaped and placed a rear defusser should fit nice if I can channel the air to it and create some downforce

the front and rear isn't hard to figure out, it's the centre

Im not so sure. I would have thought the other way around. In the end you need a flat body pan, with a cavity running down the center (driveshaft area) to channel the air. You can eithe rrip out the floors and reconstruct, or add a bottom pan below the existing floors. Exhaust can be run along the frame instead of around the driveshaft, and exit before the rear wheel to free space.


I would have though the challenge was around the front near the wheels.


It all seems pointless, because the diffuser is just going to manage the air that the rest of the underside channels. Youre never going to get a road car low enough, flat enough, or fast enough for a diffuser to be effective for downforce. Maybe it will make it laminar enough to contribute to fuel savings.

Like Smith says, it sure could be done, but done cost effectively, and for what result?