Re: Hood scoop performance ..
[Re: carnut68]
#2826685
09/29/20 10:41 PM
09/29/20 10:41 PM
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Joined: Jan 2003
Posts: 5,120 Chicago Blackhawks
hemicar1971
master
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master
Joined: Jan 2003
Posts: 5,120
Chicago Blackhawks
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Yes there is an aerodynamic factor is every car and 150 MPH things begin to happen with a lot of cars. The 1965 SSBA car is stable at 154. Another friend SS 1968 Barracuda with a big aluminum hemi ran 830 and did not fully complete the pass under total power because the air was getting under the car and making the nose super light and scary at 170 mph. The Barracuda races Hemi Shoot outs and Cam AM so making it slower was a good thing. The sealing to the hood has to be tested with every car and motor combination. Might work might not the answer with be in the Time Ticket. There will be a lot of pressure on the hood so it better be bolted down right and a strong hood.
1971 HEMI E BODY REGISTRY
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Re: Hood scoop performance ..
[Re: hemicar1971]
#2827631
10/01/20 10:09 PM
10/01/20 10:09 PM
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Joined: Mar 2003
Posts: 2,515 PA
moparacer
master
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master
Joined: Mar 2003
Posts: 2,515
PA
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I am going to fabricate a scoop for my car and will post the results when I run it next weekend. I have been running hoodless with a uni filter so I suspect it will pick me up several hundredths. Mocked one up in carboard today. To check left lane tree vision. If this works good I will fit a hood around it over the winter. Trying to get a 5.40 1/8 mile pass before year is out.
67 Barracuda street/bracket car 11.27-119 68 Dart 502 BB 8.70s-152 414 cid SB Dragster 7.65-174
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Re: Hood scoop performance ..
[Re: moparacer]
#2827647
10/01/20 11:11 PM
10/01/20 11:11 PM
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Joined: Jan 2003
Posts: 20,661 Eagle, Idaho
Neil
The Doctor is in.
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The Doctor is in.
Joined: Jan 2003
Posts: 20,661
Eagle, Idaho
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In an old issue of Mopar Collectors guide they did a feature on a white 68 hemi cuda race car and the owner cut about a 1" or so opening across the back of the hemi scoop to let some of the excess air escape. With it enclosed on all 3 sides the volume of air at the top end was pulling the hood scoop and hood apart at the front corners. For a real fast car this may be something to consider doing??? Here is the car that I'm talking about. https://www.dragracecentral.com/DRCStory.asp?ID=22155
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Re: Hood scoop performance ..
[Re: moparacer]
#2827715
10/02/20 07:30 AM
10/02/20 07:30 AM
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Joined: Jan 2003
Posts: 2,926 A shed in England
Tig
master
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master
Joined: Jan 2003
Posts: 2,926
A shed in England
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I am going to fabricate a scoop for my car and will post the results when I run it next weekend. I have been running hoodless with a uni filter so I suspect it will pick me up several hundredths.
Mocked one up in carboard today. To check left lane tree vision. If this works good I will fit a hood around it over the winter. Trying to get a 5.40 1/8 mile pass before year is out. Edit, Thought about a clear perspex scoop ?
Last edited by Tig; 10/02/20 07:32 AM.
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials. 9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge. RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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Re: Hood scoop performance ..
[Re: one bad fish]
#2827781
10/02/20 10:20 AM
10/02/20 10:20 AM
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Joined: Mar 2003
Posts: 2,515 PA
moparacer
master
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master
Joined: Mar 2003
Posts: 2,515
PA
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I am considering running a cowl hood like that setup to smooth airflow up into the scoop if my setup works. Although not as tall as that one.
67 Barracuda street/bracket car 11.27-119 68 Dart 502 BB 8.70s-152 414 cid SB Dragster 7.65-174
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Re: Hood scoop performance ..
[Re: moparacer]
#2827792
10/02/20 10:46 AM
10/02/20 10:46 AM
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Joined: Jan 2003
Posts: 2,926 A shed in England
Tig
master
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master
Joined: Jan 2003
Posts: 2,926
A shed in England
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There are a few posts about the perspex scoops on The Bullet, not many back to back tests but most claim 1 - 1.5 tenths and around 3 mph improvement. https://www.yellowbullet.com/threads/lexan-carb-scoop.567887/HTH's
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials. 9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge. RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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Re: Hood scoop performance ..
[Re: moparacer]
#2827799
10/02/20 11:04 AM
10/02/20 11:04 AM
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Joined: Jul 2008
Posts: 1,534 bronx n.y
one bad fish
pro stock
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pro stock
Joined: Jul 2008
Posts: 1,534
bronx n.y
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I am considering running a cowl hood like that setup to smooth airflow up into the scoop if my setup works. Although not as tall as that one. kool
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Re: Hood scoop performance ..
[Re: Since1822]
#2827825
10/02/20 11:44 AM
10/02/20 11:44 AM
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Joined: Oct 2003
Posts: 11,684 W. Kentucky
justinp61
I Live Here
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I Live Here
Joined: Oct 2003
Posts: 11,684
W. Kentucky
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A few weeks back I posted results regarding my hood. I have a 68 roadrunner with six pack hood on it. Victor intake and 2" super sucker put the dominator vent tubes about 3/8" away from the underside of the hood. During test and tune we took the hood off and replaced it with a 4" K&N air filter with x stream top, 14" diameter. We gained three tenths from the previous run. My hood is not sealed to carb, but do pay attention to how close the carb is to the underside of the hood. I went 11.52 with the hood and 11.20 with air cleaner and without hood. +3mph Have you tried the hood without the carb so close to it? My vent tubes are probably 3" from the roof of my scoop.
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Re: Hood scoop performance ..
[Re: A/MP]
#2827828
10/02/20 11:48 AM
10/02/20 11:48 AM
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Joined: Nov 2004
Posts: 16,493 On the run…
BloFish
I Live Here
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I Live Here
Joined: Nov 2004
Posts: 16,493
On the run…
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Last edited by BloFish; 10/02/20 11:52 AM.
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 performance ..
[Re: bigdad]
#2827867
10/02/20 01:01 PM
10/02/20 01:01 PM
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Joined: Oct 2007
Posts: 4,209 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,209
New York
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"Excess air!" Where can I buy some of that?
Boffin Emeritus
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Re: Hood scoop performance ..
[Re: justinp61]
#2827885
10/02/20 01:31 PM
10/02/20 01:31 PM
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Joined: Jul 2004
Posts: 19,318 State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,318
State of confusion
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Yes sir and cutting 5 tear drop holes in the rear made the afr's more stable and solved some siphoning issues w/the bowl vents as well......
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: Hood scoop performance ..
[Re: polyspheric]
#2827900
10/02/20 02:04 PM
10/02/20 02:04 PM
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Joined: Dec 2003
Posts: 22,696 Bitopia
jcc
If you can't dazzle em with diamonds..
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If you can't dazzle em with diamonds..
Joined: Dec 2003
Posts: 22,696
Bitopia
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"Excess air!" Where can I buy some of that? It's right here in this thread, and free, but don't take to much it will blow you away.
Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
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Re: Hood scoop performance ..
[Re: bigdad]
#2827956
10/02/20 04:01 PM
10/02/20 04:01 PM
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Joined: Oct 2007
Posts: 4,209 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,209
New York
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I understand and agree with owners/builders reporting their own experiences. What I find fault with is the idea that if these events actually occurred (and we take your word for it) that witnessing the event gives you some special insight as to exactly what caused the effects: causation vs. coincidence is perhaps the largest single fallacy in analysis. Unfortunately, although I am not by nature a lazy person, there are simply too many non sequiturs, false conclusions, rationalizations, and "it stands to reason" assumptions for a comprehensive response. Those who would enjoy reading my opinion can PM me. Thanks.
Boffin Emeritus
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