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> Air foils under car infront of engine., engine cooling
Geezer914
post Aug 24 2009, 08:08 AM
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There is a set for sale on ebay
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Gint
post Aug 24 2009, 08:23 AM
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If all you want is the functionality it would be easy to make a set from something other than plastic.
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RohJay
post Aug 24 2009, 12:22 PM
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QUOTE(Geezer914 @ Aug 24 2009, 07:38 PM) *

There is a set for sale on ebay


Can we have the link please?

QUOTE

If all you want is the functionality it would be easy to make a set from something other than plastic.


Aluminium perhaps? Will go that way if I cant find a set.
Would appreciate if someone would provide dimensions...
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Shade Tree
post Aug 24 2009, 02:18 PM
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My head temp went down almost 20 degrees on the freeway after adding these.
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SLITS
post Aug 24 2009, 02:26 PM
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You would have to put some kind of hinge and return spring if made out of aluminum. They were made to be flexible for a very obvious reason.

They are installed 385mm apart (15.5") to the tip of the wide bottom part or 7 3/4" from the centerline of the car.
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Mikey914
post Aug 25 2009, 12:36 AM
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Why not make these out of plastic? It wouldn't be too hard to extrude a profile similar (but slightly thicker). As these Have the XXX on the back of them to add reinforcement. If there's enough interest I could do these. I'ld guess about $15 a set. As far as aluminum, I could do that pretty easily on the brake, but I think it'ld get boogered up, and If you back over something it would be less forgiving than the plastic.
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Gint
post Aug 25 2009, 08:09 AM
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No good reason not to make them out of plastic... if you can extrude a similar profile in plastic. (IMG:style_emoticons/default/wink.gif) Most of us don't have that ability in our garages. Sounds like a new product opportunity Mark!
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jaxdream
post Aug 25 2009, 08:13 AM
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Would it make a difference if the air foil went all the way across the bottom , or would this hurt more than help ?? Just curious since the idea of the foil is to create a low preasure area under the engine to help scavenge the air coming in from the top through the fan blowing over the cylinders ??.....Just a thought (IMG:style_emoticons/default/confused24.gif)

Jaxdream
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SLITS
post Aug 25 2009, 08:33 AM
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Just looking at the design I would say there is a reason they do not go all the way across. Besides the flaps creating a lo pressure area beneath the cylinders, that gap between them is a "venturi" so to speak, increases the speed air moving through creating it's own "suction" to draw away expelled hot air to the center line of the car.

Hey, after two cups of coffee I can come up with all sorts of things.
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jaxdream
post Aug 25 2009, 08:58 AM
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I'm just working on my second cup . Ok , the venturi effect , wouldn't it increase the velocity of the air moving underneath ?? when the idea was to create a lower preasure area , or was it just for the ,let's say alleys of air in the general vicinity of the two paths ??

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SLITS
post Aug 25 2009, 02:51 PM
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Lo pressure behind the flaps ... higher speed air thru the center would also create a suction effect on the pool of hot air behind the flaps to take the hot air away.

Next!
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Mikey914
post Aug 25 2009, 03:46 PM
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If I extrude the same profile, we could play with how they're cut, but my first thought is to make it pretty close to the same shape, they spent a bunch of effort to make these the way they did. I know that they were a molded part instead of extruded, they may have done this as it was cheaper for them in large quantity. I know there was someone that was modeling aerodynamics for the 914, I would be curious to see if this was addressed, I know there was allot of conversation about tails, and some body effects. Anyone remember who that was?

I f there is enough interest and I do make these, it would be nice to see if we could tweak it to make it even more efficient.

and slits is correct the air has to move faster to get over the top creating a low pressure behind (venturi effect).
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montoya 73 2.0
post Aug 25 2009, 03:54 PM
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Sounds like we need some wind tunnel testing.
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DNHunt
post Aug 26 2009, 07:35 AM
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QUOTE
Sounds like we need some wind tunnel testing.


Ron might volunteer for that task too. A can of beans and him in a garage should work. (IMG:style_emoticons/default/lol-2.gif)

Dave
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KELTY360
post Aug 26 2009, 08:54 AM
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QUOTE(DNHunt @ Aug 26 2009, 06:35 AM) *

QUOTE
Sounds like we need some wind tunnel testing.


Ron might volunteer for that task too. A can of beans and him in a garage should work. (IMG:style_emoticons/default/lol-2.gif)

Dave


(IMG:style_emoticons/default/chairfall.gif) (IMG:style_emoticons/default/av-943.gif)

Might be tough to turn that 'wind' off once it gets going. Better have an exit strategy. (IMG:style_emoticons/default/icon8.gif)
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Sleepin
post Aug 26 2009, 09:06 AM
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QUOTE(Gint @ Aug 25 2009, 08:09 AM) *

No good reason not to make them out of plastic... if you can extrude a similar profile in plastic. (IMG:style_emoticons/default/wink.gif) Most of us don't have that ability in our garages. Sounds like a new product opportunity Mark!



Soon there will not be anything that Mark does not make for a 914! (IMG:style_emoticons/default/biggrin.gif) (IMG:style_emoticons/default/aktion035.gif)



Yeah, watch out for Ron's windtunnel...keep away from an open flame! (IMG:style_emoticons/default/blink.gif) (IMG:style_emoticons/default/av-943.gif)
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jaxdream
post Aug 26 2009, 09:19 AM
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QUOTE(KELTY360 @ Aug 26 2009, 06:54 AM) *

QUOTE(DNHunt @ Aug 26 2009, 06:35 AM) *

QUOTE
Sounds like we need some wind tunnel testing.


Ron might volunteer for that task too. A can of beans and him in a garage should work. (IMG:style_emoticons/default/lol-2.gif)

Dave


(IMG:style_emoticons/default/chairfall.gif) (IMG:style_emoticons/default/av-943.gif)

Might be tough to turn that 'wind' off once it gets going. Better have an exit strategy. (IMG:style_emoticons/default/icon8.gif)

Shouldn't that be an exhaust strategy ??

Jaxdream
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blitZ
post Aug 26 2009, 09:24 AM
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Couldn't you use a diffuser method to achieve the same result?
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Ferg
post Aug 26 2009, 09:24 AM
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I made a set from AL duct stuff from the hardware store and tin snips, easy as pie, only downside was they were sharp! Cut myself twice on them while under the car.

Ferg
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