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Author
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Topic: What better for drag racing cowl or ram air hood?
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70coupe
Gearhead Posts: 483
From: Toronto,Ontario,Canada
Registered: Aug 2000
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posted 09-21-2004 11:48 AM
  
I know I will get different opinions here but that is the reason for my question. Secondly, I would like to know who makes a nice fibre glass hood for my 70 mustang? If you have a picture please post it.
Thanks,
Brian
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351c 4v clsd heads
60'1.502
1/8 [email protected]
1/4 11.19@118
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Fastymz
Moderator Posts: 20708
From: Reno Nv USA M&M#1240
Registered: Apr 2001
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posted 09-21-2004 12:15 PM
Brain, forward facing open scoops in my opinion bring in more air and mostly colder air. The cowl scoop does let you avoid a lot things that you get with a forward scoop. Like rain, leaves, small pets  Keep in mind that ram air does not really start working until you reach speeds of 100mph or more. But cold air gives more power from any RPM range. If forward facing scoops didn't work you wouldn't see so many on race cars. The cowl style does give you less drag. A big open forward scoop like mine does catch lots of air. Which does cause some drag. I'm not sure where the power gain VS drag loss cross over. I think style and what your willing to put up with comes into play here too. ------------------
SCOOP oddly obsessed with big scoops on little Mustangs 65 coupe,351w,C4,Big Boss 429 hood scoop,8" 3.40 TracLoc. My Pics
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steve'66
Gearhead Posts: 9489
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 09-21-2004 01:04 PM
Brian,Here's a few options. Scroll down to the '69-70 section.
http://www.up22.com/mustang67.htm SteveW
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Fastymz
Moderator Posts: 20708
From: Reno Nv USA M&M#1240
Registered: Apr 2001
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posted 09-21-2004 01:29 PM
quote:
Originally posted by steve'66:
Brian,Here's a few options. Scroll down to the '69-70 section.
http://www.up22.com/mustang67.htm SteveW
This one is  MU-996BP ------------------
SCOOP oddly obsessed with big scoops on little Mustangs 65 coupe,351w,C4,Big Boss 429 hood scoop,8" 3.40 TracLoc. My Pics
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kid vishus
Gearhead Posts: 6405
From: middle of NC
Registered: Oct 2000
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posted 09-21-2004 02:00 PM
Here's my opinion, I don't like forward facing scoops for bracket racing. Here's why, have ever gone down the road with your hand out the window and hit a pocket of air that was 10-15* cooler than anywhere else? What do you suppose that does to the consistancy of your racecar? I would much rather give up a tenth of ET than have those mysterious .05 breakout passes after sundown. With the motor ingesting air that is all from under the hood, consistency should be better because the air is going to be closer to the same temp all the time. Especially on a car like mine where all the front end openings are blocked off. I blocked the grill and blocked the space between the bumper and valance.
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Fastymz
Moderator Posts: 20708
From: Reno Nv USA M&M#1240
Registered: Apr 2001
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posted 09-21-2004 02:10 PM
quote:
Originally posted by kid vishus:
Here's my opinion, I don't like forward facing scoops for bracket racing. Here's why, have ever gone down the road with your hand out the window and hit a pocket of air that was 10-15* cooler than anywhere else? What do you suppose that does to the consistancy of your racecar? I would much rather give up a tenth of ET than have those mysterious .05 breakout passes after sundown. With the motor ingesting air that is all from under the hood, consistency should be better because the air is going to be closer to the same temp all the time. Especially on a car like mine where all the front end openings are blocked off. I blocked the grill and blocked the space between the bumper and valance.
Rob, thats a great point.
Still doesn't explain why there are lots of racer who still use front openning scoops ? I wouldn't race with my hand out the window either. 
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SCOOP oddly obsessed with big scoops on little Mustangs 65 coupe,351w,C4,Big Boss 429 hood scoop,8" 3.40 TracLoc. My Pics
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kid vishus
Gearhead Posts: 6405
From: middle of NC
Registered: Oct 2000
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posted 09-21-2004 02:16 PM
quote:
Originally posted by Fastymz:
Still doesn't explain why there are lots of racer who still use front openning scoops ?
Sure it does, there's a lot of racers that are more concerned about that last tenth of ET than being as consistant as possible.
Another thing, depending on your car, a big forward facing scoop is a real PITA to see around (that's part of the reason why I run a cowl scoop.) And if you are a really fast car (or just have a huge difference in ET), the last thing you want is to lose your opponent behind your scoop till you go blastin around him at the finish line.
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7DMACH1
Gearhead Posts: 2646
From: PHILA. PA.
Registered: Feb 2001
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posted 09-21-2004 03:49 PM
Wonder how my car would look with a 9" cowl?
I'd have to sit on phone books!!!!!------------------
CRUISE NIGHT WEB SITE http://www.geocities.com/phillycruisenite/
[COLOR=RED][SIZE=6]
NEXT CRUISE 4/23/05[/COLOR][/SIZE]
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TomP
Gearhead Posts: 6007
From: Delta BC Canada
Registered: Dec 99
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posted 09-21-2004 04:24 PM
With a cowl scoop you don't scoop cool air in, it's more like it exhausts warm air from the engine bay unless it's sealed to the carb.
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Fastymz
Moderator Posts: 20708
From: Reno Nv USA M&M#1240
Registered: Apr 2001
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posted 09-21-2004 06:14 PM
quote:
Originally posted by kid vishus:
Sure it does, there's a lot of racers that are more concerned about that last tenth of ET than being as consistant as possible.Another thing, depending on your car, a big forward facing scoop is a real PITA to see around (that's part of the reason why I run a cowl scoop.) And if you are a really fast car (or just have a huge difference in ET), the last thing you want is to lose your opponent behind your scoop till you go blastin around him at the finish line.
All very good points. I wasn't thinking in the right way for braket racing. I've always been a big fan of front openning hood scoops. So it's a looks thing for me as much as cold air = power.
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SCOOP oddly obsessed with big scoops on little Mustangs 65 coupe,351w,C4,Big Boss 429 hood scoop,8" 3.40 TracLoc. My Pics
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Rory McNeil
Gearhead Posts: 1614
From: Surrey, B.C. Canada
Registered: Nov 2000
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posted 09-22-2004 04:19 AM
Alright, so if you don`t want the benefit of the cold air, why bother putting on any scoop at all? Personally, I HATE the looks of a Chevy styled scoop on a Ford. As for visability, LOTS of "belly button" cowl hooded 5.0 Mustangs around this area, including some huge ones, 6"`s or more. I can`t see how a 6" tall cowl hood would have any better visability than a similar height foreward facing scoop.------------------
78 Fairmont 428 4 speed 10.20@130mph
80 Fairmont 302 5 speed 12.8@105mph
85 Mustang NHRA M/Stock 302 5speed. [email protected]
59 Meteor (Canadian Ford) 2 dr sedan 332, auto
74 F350 ramp truck 390 4spd
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kid vishus
Gearhead Posts: 6405
From: middle of NC
Registered: Oct 2000
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posted 09-22-2004 07:27 AM
quote:
Originally posted by Rory McNeil:
Alright, so if you don`t want the benefit of the cold air, why bother putting on any scoop at all?
I needed carb to hood clearance. I don't like the really tall cowl hoods either, and thats why mine is only 2 1/2" tall. I would never run one more than 4" tall, if that tall. But, I like the way my 'Chevy' hood looks on my Ford. 
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kcode
Gearhead Posts: 3232
From: alvaton,ky,usa Suburb of Bowling Green, M&M #79, MCA #29208
Registered: Jun 99
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posted 09-23-2004 10:20 PM
One benefit of a unsealed cowl hood is that it gives the oil someplace to go when the dipstick blows out at 6500 rpm, all over the windshield. Word of experience.Mike
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Dubz
Gearhead Posts: 1890
From: Manitoba Canada
Registered: Oct 2002
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posted 09-23-2004 11:37 PM
wish i coulda gone out and bought a scooped or cowl hood for my torino, lucky mustang owners  anyway, i read an article or saw a demonstration (can't remember now) that showed that sometimes forward facing scoops would cause a vaccum outwards due to some aerodynamic effect, something similar to a plane wing or the like, where as a cowl hood was sucking air from a high pressure pocket (denser) since i can't remember the source, i can't say it's terribly credible or not, but i did decide to go with a cowl because they were easier to make (when you don't have an aftermarket to shop from)
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