Duster Hood Scoop
#1142890
12/24/11 01:07 AM
12/24/11 01:07 AM
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Joined: Mar 2008
Posts: 553 Kentucky
clovis
OP
mopar
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OP
mopar
Joined: Mar 2008
Posts: 553
Kentucky
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Motor is finally done and now it is time to get some kind of scoop on the car. With the old TR setup I had a bug catcher with a 2" spacer to get it into the good air. Now I have a single dominator on a 440-3 so the top of the carb nearly sets level with the hood. I plan to mph somewhere in the low 130's so I am thinking of using a cowl but I have some questions. 1) How close to the windshield does it have to be to become functional? 2) Has anyone got a cowl close to the windshield on Duster using a regular hinged hood? 3) How high off the carb does the scoop need to be with a cowl? If I go forward facing scoop what could I use that would be functional? I read through several posts and there is two facts that seem to contradict each other in regards to forward facing scoops- a) at speeds over 120 the scoop lifts hard on the hood b) because the scoop is below the "good air" line (front of hood to the top of windsheild) it provides no performance gains. It seems that if the scoop is creating that much lift then it is getting a lot of air. My third option is to make another bug catcher to go on top of the dominator. Again it would be difficult to get it high enough to get into the "good air". Sorry so long but thanks for any help.
'75 Plymouth Duster Phase I 451 906/590/2-660 10.75/126 Phase II 451 Stage VI/590/1050 9.82/135 Phase III 383 906/Victor-Pump gas 11.30/119
"For by grace you have been saved through faith. And this is not your own doing; it is the gift of God,"
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Re: Duster Hood Scoop
[Re: Thumperdart]
#1142897
12/24/11 02:52 AM
12/24/11 02:52 AM
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Joined: Dec 2006
Posts: 4,647 aotearoa
rebel
master
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master
Joined: Dec 2006
Posts: 4,647
aotearoa
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Quote:
Is YOUR scoop sealed?
close but not 100% tight as the front clip flexes at speed.
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Re: Duster Hood Scoop
[Re: Dap]
#1142899
12/24/11 10:59 AM
12/24/11 10:59 AM
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Joined: Oct 2006
Posts: 4,590 Indy
joshking440
Lunch is on me!
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Lunch is on me!
Joined: Oct 2006
Posts: 4,590
Indy
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Re: Duster Hood Scoop
[Re: joshking440]
#1142900
12/24/11 11:26 AM
12/24/11 11:26 AM
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Joined: Mar 2008
Posts: 553 Kentucky
clovis
OP
mopar
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OP
mopar
Joined: Mar 2008
Posts: 553
Kentucky
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Dap What you have is more in line with what I am considering-how tall is it? How far back does it extend past the back of the hood? I see this as the biggest problem with a cowl on a Duster as there is nearly 8" between the back of the hood and windshield. It seems like the folks that are seeing good results have them close to the windshield, but I am unsure if they seal them or not. I am also still curious if there is some science to how far above the carbs the scoop is. Just so we keep this interesting, I have considered taking a short cowl scoop and turning it around so the the opening is very near the front of the hood, as to get the "good air", kinda like the aero style super stock scoops that get the opening low and very near the front of the car.
Last edited by clovis; 12/24/11 11:27 AM.
'75 Plymouth Duster Phase I 451 906/590/2-660 10.75/126 Phase II 451 Stage VI/590/1050 9.82/135 Phase III 383 906/Victor-Pump gas 11.30/119
"For by grace you have been saved through faith. And this is not your own doing; it is the gift of God,"
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Re: Duster Hood Scoop
[Re: joshking440]
#1142903
12/24/11 01:08 PM
12/24/11 01:08 PM
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Joined: Apr 2009
Posts: 3,415 Toronto
mshred
master
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master
Joined: Apr 2009
Posts: 3,415
Toronto
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Quote:
Cowl Hood here 6"
Josh, is yours lift off or bolt on? Love how it looks and would like one for mine that extends that far back, but not sure if I need it to be a lift off or a bolt on...I think a lift off on a street car could be a bit of a pain
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Re: Duster Hood Scoop
[Re: clovis]
#1142904
12/26/11 04:14 AM
12/26/11 04:14 AM
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Joined: Jan 2003
Posts: 1,855 Staten Island N.Y.
Dap
top fuel
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top fuel
Joined: Jan 2003
Posts: 1,855
Staten Island N.Y.
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The cowl scoop is 4" tall and it is probably about 8" from the windshield. My 4.5" K&N air filter fits good underneith it. I am thinking about glassing in the underside of the scoop and sealing off the back leaving the very front part over the rad support grill section open. Then making an air pan to seal the carb to that. The contour of the inside of the hood reminds me of the aero scoop I have.
PRH446 10.084 @ 135.21 mph N/A through chambered mufflers,3300lbs. Stock stroke wedge
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Re: Duster Hood Scoop
[Re: Dap]
#1142905
12/26/11 12:14 PM
12/26/11 12:14 PM
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Joined: Mar 2008
Posts: 553 Kentucky
clovis
OP
mopar
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OP
mopar
Joined: Mar 2008
Posts: 553
Kentucky
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Since I am adding the scoop to a metal hood I was going to seal the carb to the hood with the idea that the air would be pulled from the back. This is part of my debate on the length, as I was curious if I need to have the scoop (front edge) very close to the carb thus making the carb the end of tunnel, if that makes any sense. It also plays into the height as I am unsure if the smaller the area the better the potential velocity.
Because of my hinged metal hood, I'm also processing how to the get the scoop to the windshield, currently I am thinking of trying to simply attach a fixed extension on the cowl area that would seal to the scoop when the hood is down.
'75 Plymouth Duster Phase I 451 906/590/2-660 10.75/126 Phase II 451 Stage VI/590/1050 9.82/135 Phase III 383 906/Victor-Pump gas 11.30/119
"For by grace you have been saved through faith. And this is not your own doing; it is the gift of God,"
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Re: Duster Hood Scoop
[Re: clovis]
#1142906
12/26/11 12:35 PM
12/26/11 12:35 PM
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Joined: Jun 2008
Posts: 577 Arkansas
Adrielp
mopar
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mopar
Joined: Jun 2008
Posts: 577
Arkansas
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I think you may want to look at Street Roadster scoops. I believe they would look good on a duster. you could tie it in pretty well to the flat hood and most have a closed back. Check out the cad drawing below.
Last edited by Adrielp; 12/26/11 12:37 PM.
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Re: Duster Hood Scoop
[Re: clovis]
#1142907
12/26/11 02:46 PM
12/26/11 02:46 PM
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Joined: Jan 2003
Posts: 6,531 Jacksonville, FL
Chris2581
master
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master
Joined: Jan 2003
Posts: 6,531
Jacksonville, FL
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I have a 5" Pro Stock style scoop.The fastest I've gone is 117 and the hood lifts up against 6 hood pins.The scoop is sealed,and I have blocked the scoop opening,(using the cover in the picture) to see if the scoop works and I slowed down a bunch doing so.Now I also use a single 4bbl carb,and according to the Mopar race manuals this scoop shouldn't work,but it works fine for me.
Nautilus Racing- We use Superformance gaskets and Turbo Action converters/products.
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