undertrays
Former Moderator. RIP Icemark.
Joined: Apr 2001
Posts: 25,896
Likes: 24
From: Rohnert Park CA
Originally Posted by Twofer
and even if you don't like 350Z's, you have to admire the work Nissan put in to it.
Originally Posted by Tech_Greek
Yes,
Exactly, the hood scoop would make it cool easier, and I intend on getting a TII hood just for that reason BUT that hot air has to go somewhere, why not make it exit out the back?
It's the same concept as the exhaust...why not just let it exit in the engine bay - because heat is bad and you want it as far away from the engine as possible.
It's the same way a PC Case works with fans, you have an intake and exhaust fan, one sucks in and the other blows out...
Exactly, the hood scoop would make it cool easier, and I intend on getting a TII hood just for that reason BUT that hot air has to go somewhere, why not make it exit out the back?
It's the same concept as the exhaust...why not just let it exit in the engine bay - because heat is bad and you want it as far away from the engine as possible.
It's the same way a PC Case works with fans, you have an intake and exhaust fan, one sucks in and the other blows out...
you're not quite getting what i'm saying even though it is rather moot.
the better way to describe it is a tunnel, say like a house attic, with one fan pulling air into the attic but not one pulling air out, most of the hot air still lingers.
you would be right IF there was something pulling air to the back of the car, but there isn't at slow speeds, where the engine bay is hottest.
Rockn' The Galant
Joined: Jan 2005
Posts: 1,901
Likes: 0
From: Shreveport, LA
Originally Posted by Karack
you're not quite getting what i'm saying even though it is rather moot.
the better way to describe it is a tunnel, say like a house attic, with one fan pulling air into the attic but not one pulling air out, most of the hot air still lingers.
you would be right IF there was something pulling air to the back of the car, but there isn't at slow speeds, where the engine bay is hottest.
the better way to describe it is a tunnel, say like a house attic, with one fan pulling air into the attic but not one pulling air out, most of the hot air still lingers.
you would be right IF there was something pulling air to the back of the car, but there isn't at slow speeds, where the engine bay is hottest.
I could technically put vents on the hood as well, that way only at low speeds does the engine vent and at high speeds it goes out the back.
Also the hood scoop would technically act like a chimney if you will.
Registered 7 User
Joined: Jul 2005
Posts: 135
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From: Kitchener, Ont, Ca
Originally Posted by Icemark
You mean Renault put into it. Renault owns Nissan (if you couldn't tell by the funky Euro design).
most people put reverse ducted hoods for that reason in highly modded engines, it allows hot air to escape while not moving and at higher speeds it acts like a vacuum to pull hot air out of the bay.
Passing life by
Joined: Feb 2005
Posts: 4,028
Likes: 2
From: Scotland, USA
most people put reverse ducted hoods for that reason in highly modded engines, it allows hot air to escape while not moving and at higher speeds it acts like a vacuum to pull hot air out of the bay.
Thread Starter
Joined: Mar 2002
Posts: 8,736
Likes: 18
From: Windsor, On
ok, my thread has nothing to do with engine cooling, and more to do with preventing lift and reducing drag at high speeds....
and cowl induction works very well, which is why rasing the rear of the hood an inch is the most retarded mod ever, it isn't going to vent out the back, its going to be forced in!
and cowl induction works very well, which is why rasing the rear of the hood an inch is the most retarded mod ever, it isn't going to vent out the back, its going to be forced in!
Originally Posted by Icemark
Actually the underpan for under the oil pan is one of the things that help drop the Cd of the Sport get down to .29 instead of the .32 found on most other coupes.
Note the above picture is not to scale. The front pan (labled 56-1-11B) is considerably bigger than the aero cover (labled 56-11Y)
Joined: Dec 2003
Posts: 6,598
Likes: 10
From: Temple, Texas (Central)
Originally Posted by Tech_Greek
Mean Cowl?
I don't think anyone makes a cowl hood for our cars...
I don't think anyone makes a cowl hood for our cars...
Ever drive a VW Beetle above 70mph? They have a flat bottom like you are thinking, they want to fly away. You can just about turn the steering wheel back and forth and keep going where the body is pointed! There is more to aero improvement than smooth floor pans. You have to keep air from getting under the car if you can't start from scratch with the design of the car.
I'm not knocking your idea, hopefully just giving you some things you may not have thought of.
I'm not knocking your idea, hopefully just giving you some things you may not have thought of.
Thread Starter
Joined: Mar 2002
Posts: 8,736
Likes: 18
From: Windsor, On
if it looks like it attaches to the bottom of the car, is made out of aluminum, and looks like an undertray - its the one.
it's kindof shaped like a half circle, uhh, sorta.
jgrewe, thanks! Yeah I know I need to deal with the front too, I'm actually just trying to figure out the most effective path for reducing drag and possibly increasing downforce.
it's kindof shaped like a half circle, uhh, sorta.
jgrewe, thanks! Yeah I know I need to deal with the front too, I'm actually just trying to figure out the most effective path for reducing drag and possibly increasing downforce.
