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> Front hood scoop
wingnut86
post Jan 5 2012, 09:03 PM
Post #21


...boola la boo boola boo...
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Hand made or re-purposed?


QUOTE(Britain Smith @ Jan 5 2012, 01:55 PM) *

Vented Carbon Fiber Louvers...works awesome.

(IMG:http://a3.sphotos.ak.fbcdn.net/hphotos-ak-ash2/181041_1538642912578_1430063084_31131848_4143754_n.jpg)

(IMG:http://a5.sphotos.ak.fbcdn.net/hphotos-ak-ash2/179487_1538642992580_1430063084_31131849_4365397_n.jpg)

-Britain
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Mike Bellis
post Jan 5 2012, 11:48 PM
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QUOTE(SirAndy @ Jan 4 2012, 12:24 PM) *

The first adds a lot of hot air under the car, the second adds a lot of hot air onto the front brakes.


The hot air on the brakes at 180-190F is cooler than hot brakes. It can actually act as cooling on the track when you are on the brakes a lot.

I think cooling through the fender wells is the most proven cooling design for a street car.
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Britain Smith
post Jan 5 2012, 11:53 PM
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I got those vents from here:

http://www.genesisparts.com/index.cfm?tpc=...;action=product

They weren't cheap, but serve the purpose.

I am not a fan of the air vents in the wheel wells, that is the last place I want air to go at high speed.

-Britain
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szuccaro
post Jan 6 2012, 12:01 AM
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Here's my idea... taken from the late model turbo T-bird... Steve


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szuccaro
post Jan 6 2012, 12:05 AM
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and applied to the side, looks like this.


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brant
post Jan 6 2012, 12:10 AM
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do you have a cooler under there?...
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szuccaro
post Jan 6 2012, 12:53 AM
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QUOTE(brant @ Jan 5 2012, 11:10 PM) *

do you have a cooler under there?...


purely non-functional
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Elliot Cannon
post Jan 6 2012, 01:33 AM
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QUOTE(szuccaro @ Jan 5 2012, 10:53 PM) *

QUOTE(brant @ Jan 5 2012, 11:10 PM) *

do you have a cooler under there?...


purely non-functional

It looks like their function is to cause aerodynamic drag. (IMG:style_emoticons/default/happy11.gif)
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SirAndy
post Jan 6 2012, 01:39 AM
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QUOTE(kg6dxn @ Jan 5 2012, 09:48 PM) *
QUOTE(SirAndy @ Jan 4 2012, 12:24 PM) *
The first adds a lot of hot air under the car, the second adds a lot of hot air onto the front brakes.


The hot air on the brakes at 180-190F is cooler than hot brakes. It can actually act as cooling on the track when you are on the brakes a lot.

I think cooling through the fender wells is the most proven cooling design for a street car.

Proven by what exactly? I'd rather have fresh air to cool my brakes.
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Stonepilot
post Jan 6 2012, 06:22 AM
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QUOTE(szuccaro @ Jan 6 2012, 12:05 AM) *

and applied to the side, looks like this.

nice looking!
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pcar916
post Jan 6 2012, 08:04 AM
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Here's mine. It's illegal in SCCA track events though.

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Good luck
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wingnut86
post Jan 6 2012, 08:10 AM
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I looked through the rules previously, but, why do they say no to that design?

are there other in-hood venting designs they say yes to?
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brant
post Jan 6 2012, 09:25 AM
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cross post from my street car thread:



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pcar916
post Jan 6 2012, 09:41 AM
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Is that a Lola?
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QUOTE(wingnut86 @ Jan 6 2012, 08:10 AM) *

... why do they say no to that design?
are there other in-hood venting designs they say yes to?


It wasn't part of the original design of the car, and they consider it an air diverting structure, as if air through a big cooler would add downforce to the front of the car.
It also wasn't part of the original design of the car. To be fair it's been years since I looked into it so this is now second hand info to me. Anyone who knows this has changed can chime away.

I first evacuated the exhaust under the car but not only did it not cool the oil very well (inlet too small... my design error) but I figured it was simply heating air back to the engine. The 993 engine needs a full-time cooler since engine cooler behind cylinder #6 was deleted.
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SirAndy
post Jan 6 2012, 01:14 PM
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QUOTE(pcar916 @ Jan 6 2012, 07:41 AM) *
as if air through a big cooler would add downforce to the front of the car.

If i recall correctly, the guy that did all the air flow tests on modified 914 chassis a while back reported a significant increase in downforce with a hood vent.

From my armchair physics perspective, that would make sense.
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Andyrew
post Jan 6 2012, 01:16 PM
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^ I would agree with this as well.

It might not make much of a difference at 60mph, but at 100mph it would probably be fairly noticeable.
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Britain Smith
post Jan 6 2012, 01:21 PM
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I have been thru the fight with the SCCA guys on hood venting, what I did with the louvers was the best I could do within the rules for Autocross. There can be no actual ducting underneath either.

-Britain
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SirAndy
post Jan 6 2012, 02:29 PM
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QUOTE(Britain Smith @ Jan 6 2012, 11:21 AM) *
I have been thru the fight with the SCCA guys on hood venting, what I did with the louvers was the best I could do within the rules for Autocross. There can be no actual ducting underneath either.

On that note, one of the 911 guys that runs in the Toyo spec class with PRC here locally showed up with a hood exit vent for his front mounted oil cooler last summer.
(Pretty well known guy too)

When i asked the officials about the obvious rule violation, i got the following answer:

"He's too slow anyways. Once he starts winning, we'll worry about that."


Gotta love those guys!
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bulitt
post Jan 6 2012, 03:09 PM
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QUOTE(brant @ Jan 6 2012, 10:25 AM) *

cross post from my street car thread:


I'm thinking you could close off the front half of your exit opening and not lose much airflow?
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MDG
post Jan 6 2012, 03:10 PM
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Hood scoop from the lastest Ferrari GTO concept on a random pic of a 914

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