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Hood scoop pressure too much on big end. SSAH Type
#1616513
05/05/14 02:46 PM
05/05/14 02:46 PM
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Joined: Jan 2003
Posts: 3,048
Richmond, Tx. (Houston)
GTSDave
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OP
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Posts: 3,048
Richmond, Tx. (Houston)
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Looks like I may have issues with my hood scoop working too well. Last outing on the big end my hood was wanting to lift up at the rear in the center. I was up in the 135mph range with a head wind.
Car is a 68 Barracuda FB with SSAH type HEMI scoop molded into a fiberglass hood. No carb / hood seal plate, just blowing down into the engine compartment.
What have you done to relieve pressure on the top end with your hood scoop? What do you suggest? What has worked for you in the past?
-Dave
PLEASE Pray for our brothers and sisters in harms way. If you are the owner of a GTS us at the GTS Registry www.gtsregistry.com
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Re: Hood scoop pressure too much on big end. SSAH Type
[Re: Cab_Burge]
#1616515
05/05/14 03:12 PM
05/05/14 03:12 PM
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Joined: Jan 2003
Posts: 3,048
Richmond, Tx. (Houston)
GTSDave
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I don't think the class rules (NSS) would allow me to add a spoiler. Was thinking of a belly pan instead of an engine diaper. Maybe I can kill two birds with one stone.
Pretty sure I cant block off the radiator area either.
-Dave
PLEASE Pray for our brothers and sisters in harms way. If you are the owner of a GTS us at the GTS Registry www.gtsregistry.com
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Re: Hood scoop pressure too much on big end. SSAH Type
[Re: GTSDave]
#1616518
05/05/14 06:52 PM
05/05/14 06:52 PM
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Joined: Jan 2003
Posts: 6,531
Jacksonville, FL
Chris2581
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master
Joined: Jan 2003
Posts: 6,531
Jacksonville, FL
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Fastest I've gone was 116 and my hood does the same thing,although it now lifts against the hood pins.I have 3 pins across the back and 3 across the front.71 Demon with snorkel scoop.
Nautilus Racing-
We use Superformance gaskets and Turbo Action converters/products.
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Re: Hood scoop pressure too much on big end. SSAH Type
[Re: Thumperdart]
#1616519
05/05/14 07:14 PM
05/05/14 07:14 PM
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Joined: Aug 2008
Posts: 4,071
Mo.
racerx
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Mo.
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Quote:
Drill holes in the back of the scoop.............. 
^^^This^^^ I'm thinking of trying with my 5"T/A hood.
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Re: Hood scoop pressure too much on big end. SSAH Type
[Re: OUTLAWSSAA]
#1616522
05/06/14 01:30 AM
05/06/14 01:30 AM
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Joined: Jan 2003
Posts: 3,048
Richmond, Tx. (Houston)
GTSDave
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Quote:
Dave, there's only one way to fix that problem. I had the same thing happen. You have to put in 8 pins. Three on each side of the hood, and that will take care of it.
Thanks Outlaw,
I am no where near as quick as you guys. I run a low deck wedge with a Jerico. Still launching fairly easy, but the thing is making great power so we are slowing it down until we get it tuned the way we want. We built it to run FX Classes. The MPH has me worried with the scoop the way it is because it is already trying to pull of the car on the big end and we don't have it turned up yet. It will only get worse.
Right now we have brackets glassed in and we are using the factory style hinges with no springs. Up front one dutz in the center with two pins in stock location.
I may end up drilling the holes in the back of it, and probably adding more pins. With the hinges pins wont work because of the angle it opens at, but it is worth looking into. I am not sure how it would work with airflow across the carbs if we drill the holes. I use a heavily modified STR intake with dual eddy 800's inline configuration.
Thumper do you have any pics of yours you willing to share? What are you running for cabs, and did the holes make that much difference in your O2 readings?
-Dave
PLEASE Pray for our brothers and sisters in harms way. If you are the owner of a GTS us at the GTS Registry www.gtsregistry.com
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Re: Hood scoop pressure too much on big end. SSAH Type
[Re: Thumperdart]
#1616529
05/06/14 01:19 PM
05/06/14 01:19 PM
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Joined: Jan 2003
Posts: 3,048
Richmond, Tx. (Houston)
GTSDave
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Richmond, Tx. (Houston)
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Thumper, Couldn't find that thread, but did find one where you had a couple of pics. Looks like they didn't need to be very big at all. Do you think they would work without the pan, or does it need the pan to work? https://board.moparts.org/ubbthreads/show...amp;Search=truemikeysmopars Love your car. Thanks for the pics. It gives me some ideas for where to mount additional pins. Thanks again to everyone who replied. It gives me some ideas to work with. Depending on the weather, we are planning to run in St. Louis this weekend, and if all goes well again over Memorial day for the Dave Dual Classic. -Dave
PLEASE Pray for our brothers and sisters in harms way. If you are the owner of a GTS us at the GTS Registry www.gtsregistry.com
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Re: Hood scoop pressure too much on big end. SSAH Type
[Re: sshemi]
#1616533
05/06/14 10:12 PM
05/06/14 10:12 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
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Posts: 52,972
Romeo MI
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Quote:
Sorry to highjack but what gains can be expected going from a stock Hood to a glass with hemi scoop on a -68 barracuda?
Anyone ever did a somewhat fair back to back test on this?
You should see .2 gain if sealed... maybe a bit more
depending on the current tune up
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Re: Hood scoop pressure too much on big end. SSAH Type
[Re: MR_P_BODY]
#1616536
05/07/14 03:23 AM
05/07/14 03:23 AM
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Joined: Aug 2004
Posts: 2,128
sweden
sshemi
top fuel
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top fuel
Joined: Aug 2004
Posts: 2,128
sweden
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Quote:
Quote:
Sorry to highjack but what gains can be expected going from a stock Hood to a glass with hemi scoop on a -68 barracuda?
Anyone ever did a somewhat fair back to back test on this?
You should see .2 gain if sealed... maybe a bit more
depending on the current tune up
Wow. I didnt think it would be that much.
Guess im gonna start saving some money.
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Re: Hood scoop pressure too much on big end. SSAH Type
[Re: sshemi]
#1616537
05/07/14 10:52 PM
05/07/14 10:52 PM
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Joined: Nov 2004
Posts: 6,890
North Alabama
Monte_Smith
master
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Joined: Nov 2004
Posts: 6,890
North Alabama
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Quote:
Quote:
Quote:
Sorry to highjack but what gains can be expected going from a stock Hood to a glass with hemi scoop on a -68 barracuda?
Anyone ever did a somewhat fair back to back test on this?
You should see .2 gain if sealed... maybe a bit more
depending on the current tune up
Wow. I didnt think it would be that much.
Guess im gonna start saving some money.
I wouldn't BANK on it netting you 2/10ths. As a matter of fact if the carb is not too close to the hood now with NO scoop, adding one may not help it at all. Most factory scoops were not put on because they worked. Most were for strictly looks or air cleaner clearance.
Monte
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Re: Hood scoop pressure too much on big end. SSAH Type
[Re: GTSDave]
#1616539
05/12/14 10:47 PM
05/12/14 10:47 PM
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Joined: Nov 2004
Posts: 16,484
On the run…
BloFish
I Live Here
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I Live Here
Joined: Nov 2004
Posts: 16,484
On the run…
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Here's what I did to mine.
It really doesn't matter whether you win or lose…
as long as you look good doing it!
‘65 A100
‘69 ‘Cuda
‘73 Vega GT
‘06 Mega Cab
‘14 Mercedes SLK
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Re: Hood scoop pressure too much on big end. SSAH Type
[Re: Monte_Smith]
#1616541
05/13/14 02:10 AM
05/13/14 02:10 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Quote:
Quote:
Quote:
Sorry to highjack but what gains can be expected going from a stock Hood to a glass with hemi scoop on a -68 barracuda?
Anyone ever did a somewhat fair back to back test on this?
You should see .2 gain if sealed... maybe a bit more
depending on the current tune up
Wow. I didnt think it would be that much.
Guess im gonna start saving some money.
I wouldn't BANK on it netting you 2/10ths. As a matter of fact if the carb is not too close to the hood now with NO scoop, adding one may not help it at all. Most factory scoops were not put on because they worked. Most were for strictly looks or air cleaner clearance.
Monte
This is very true with those low style factory scoops..
most of them are JUNK but the mopar people HAVE to
have them.... they arent up in the clean air flow
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Re: Hood scoop pressure too much on big end. SSAH Type
[Re: MR_P_BODY]
#1616542
05/13/14 05:36 AM
05/13/14 05:36 AM
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Joined: Aug 2004
Posts: 2,128
sweden
sshemi
top fuel
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top fuel
Joined: Aug 2004
Posts: 2,128
sweden
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My carb is very close to the Hood now. I even need to use a drop base with a 2,5" filter! I wonder if cold air is just as important with E85 as with gas? 
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Re: Hood scoop pressure too much on big end. SSAH Type
[Re: sshemi]
#1616544
05/13/14 10:24 AM
05/13/14 10:24 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
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Posts: 52,972
Romeo MI
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Quote:
My carb is very close to the Hood now.
I even need to use a drop base with a 2,5" filter!
I wonder if cold air is just as important with E85 as with gas?
Yes it is as important... air is air.. if its already
expanded you dont fit as much in
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Re: Hood scoop pressure too much on big end. SSAH Type
[Re: MR_P_BODY]
#1616545
05/13/14 11:11 AM
05/13/14 11:11 AM
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Joined: Jan 2004
Posts: 8,275
fredericksburg,va
cudaman1969
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master
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Posts: 8,275
fredericksburg,va
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Just thinking out loud but wouldn't the hood try to raise because of fast moving air (low pressure) above, than the slow moving air under the hood (high pressure)?  Like a convertible top
Last edited by cudaman1969; 05/13/14 11:14 AM.
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A good spoiler mounted in front of the radiator core support will help also 
It trys to blow the hood off at 135+ MPH also on the throttle stop 
