Re: Front Spoilers...
[Re: BigBlockMopar]
#1438712
06/27/13 03:22 PM
06/27/13 03:22 PM
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Joined: Jan 2010
Posts: 1,443 NW Chicago suburban area
Mopar Mitch
pro stock
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pro stock
Joined: Jan 2010
Posts: 1,443
NW Chicago suburban area
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OK... s/b a-body... good start being lighter overall weight. The 1" TBs would be better noticable, but I'd still suggest a little stiffer.. maybe 1.06.. 1.108.. 1.10. sounds like a long-term project with lots of fun rewards!
Mopar Mitch
"Road racers and autocrossers go in deeper and come out harder!"... and rain never stops us from having fun with our cars... in fact, it makes us better drivers!
Check out MOPAR ACTION MAGAZINE, August 2006 issue for feature article and specs on my autocross T/A!
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Re: Front Spoilers...
[Re: BigBlockMopar]
#2171014
10/09/16 05:58 PM
10/09/16 05:58 PM
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Joined: Jan 2003
Posts: 3,575 The Netherlands
BigBlockMopar
OP
master
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OP
master
Joined: Jan 2003
Posts: 3,575
The Netherlands
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Topic-revival: I finally mounted the front spoiler on my daily driven '73 Dart; The sides of the spoiler were cut and modelled to fit the contours of the valance and front fender better. Currently it's mounted with 6 bolts. Used 2 existing holes in the lower valance. Might want to add 2 more in the valance. For the time being I'm OK with the looks.
Last edited by BigBlockMopar; 04/17/18 07:02 PM. Reason: Fixed images
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Re: Front Spoilers...
[Re: BigBlockMopar]
#2171128
10/09/16 09:40 PM
10/09/16 09:40 PM
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Joined: Dec 2003
Posts: 23,273 Here
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: 23,273
Here
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Topic-revival:
For the time being I'm OK with the looks.
I think it looks nice The problem to be most effective they often don't look nice. I bet there is worthwhile DF, to be gained if you want by simply pop riveting(?) on a plastic/rubber 2'? vertical piece to the lower spoiler lip, just soft enough to handle a high parking curb, but still stiff enough for high speed jaunts.
" All sorts of things can happen when you are open to new Ideas" Inventor of Kevlar
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Re: Front Spoilers...
[Re: BigBlockMopar]
#2171669
10/10/16 08:34 PM
10/10/16 08:34 PM
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Joined: Sep 2008
Posts: 656 Florida
CJD AUTOMOTIVE
mopar
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mopar
Joined: Sep 2008
Posts: 656
Florida
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I'll throw in my $02. I see some forward angled spoilers in the thread, behind the rear bumper. This is probably worse than no spoiler. The air pressure collects where the spoiler meets the bumper and actually pushes the bumper up, creating front lift (upside down splitter). The front valance needs to be vertical or angled slightly back with a flat splitter lip perpendicular to the road surface or raked slightly forward. The air hitting the valance will push down on the splitter lip instead of up on the bumper. The pic above shows the valence portion angled slightly back and a lip at the bottom to create downforce, but the huge hole in the middle pretty much negates any effect. The air is entering the engine compartment, pushing up on the hood, creating lift, or exiting under the car, again creating lift and horrible turbulence.
These old muscle cars have horrible frontal area, but fantastically huge, flat hoods. Combined with the windshield rake, this is an opportunity for BIG downforce. Think of the the hood as a flat trunk and the windshield as the spoiler. Lots of surface area. There are huge gains to be made simply managing the airflow coming into the the engine compartment and under the car. That is where you will see the biggest dividends from any frontal aero work.
Craig Scholl CJD Automotive, LLC Jacksonville, FL www.CJDAUTOMOTIVE.com904-400-1802 "I own a Mopar. I already know it won't be in stock, won't ship tomorrow, and won't fit without modification"
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Re: Front Spoilers...
[Re: CJD AUTOMOTIVE]
#2172437
10/11/16 08:57 PM
10/11/16 08:57 PM
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Joined: Dec 2003
Posts: 23,273 Here
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: 23,273
Here
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I think your comment needs some more discussion before we move on. What stands out to me: 1. I agree that the positive intent of the spoiler can often be negated by other features, sometimes not always first apparent. 2. In the OP's case, any air the pictured spoiler redirects, has to restrict an certain amount of under car air flow, that is a plus. 3. Some of the redirected air, but not all of this redirected air will find a path into engine compartment. 4. There are two main reasons for that, the pressure in front will be higher, and the pressure behind will now be lower, because of the under car airflow has been restricted by this spoiler. 5. It is not difficult to restrict this now higher pressure area entering engine compartment in the front, by adding simple well designed blockage, but still retaining adequate airflow for cooling. 6. The high pressure air that now has been restricted thru the radiator, has three other pathways available, back under the car, least likely, around the sides, and over the hood. 7. In the last example above, and IMO, often the most likely path, the high pressure in front will exert pressure on the underside ( and topside) of any non vertical surfaces, like the bumper ( which in the OP's car really is not a large horizontal area, as bumpers go) 8. However, this high pressure area will also exert an almost equal downforce in the same bumper from the top, showing no real change in DF from this bumper issue. 9. The real gain in DF will be from any additional flow over the hood as noted, and any reduction also found in under hood pressure. Other then that we agree. This is my solution in a similar car pic #73, note in this pic the upper grille is completely block with lexan, the brake ducks have not been enlarged, and the spoiler has separate end vanes, and with short rubber extension for streetability as I noted earlier. https://board.moparts.org/ubbthreads/ubbt...tml#Post1553895EDir #2 I made to clarify my response, Craig's issue with underbumper air build negating DF certainly has merit, and is as he mentions, difficult to overcome with our older bumper set-ups
Last edited by jcc; 10/16/16 01:40 PM.
" All sorts of things can happen when you are open to new Ideas" Inventor of Kevlar
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Re: Front Spoilers...
[Re: BigBlockMopar]
#2172572
10/11/16 11:59 PM
10/11/16 11:59 PM
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Joined: Feb 2011
Posts: 4,302 Nebraska
72Swinger
master
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master
Joined: Feb 2011
Posts: 4,302
Nebraska
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Ive thought about how to implement a diffuser to the rear of my car. But nothing passes the taste test. Its stable as all get out up to 150, havent stayed in it past that.
Mopar to the bone!!!
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Re: Front Spoilers...
[Re: dangina]
#2172607
10/12/16 12:36 AM
10/12/16 12:36 AM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
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About to go away
Joined: Sep 2007
Posts: 14,889
up yours
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has anyone experimented with vortex generators on our cars like they use on evos to funnel the air towards the rear, doesn't look pretty but has always been a thought Having been involved in a project to put these on wind turbine blades I will say this, without a wind tunnel to test and optimize them you are wasting your time.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: Front Spoilers...
[Re: BigBlockMopar]
#2483813
04/16/18 08:25 PM
04/16/18 08:25 PM
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Joined: Jan 2003
Posts: 3,575 The Netherlands
BigBlockMopar
OP
master
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OP
master
Joined: Jan 2003
Posts: 3,575
The Netherlands
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Major UPDATE!!!! ...not Added a small lip on the front spoiler to extend it a tiny bit further down. Problem is, I thought the lip I ordered was a bit more sturdy, but it's just a foam-type rubber lip, so it will probably simply fold over and won't do much on higher speeds. But for the looks I don't think it hurts much Whenever I find myself a better piece of ABS plastic or rubber, I will replace it with the current lip;
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