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  #21  
Old 09-13-2000, 08:20 AM
Baker Baker is offline
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Location: Longview, Texas
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MM sayeth:
[qoute]they are situated to actually block the air and force it down over the rear surface of the rig not to act as a spoiler.[/quote]

That's what a spioler's supposed to do--break up the airflow and fill the vacuum pocket behind the vehicle, decreasing drag.

You're talking about a wing, which is in looks and in practice, the same as an airplane wing upside down. Don't make me go into the math of wings and lift (or downforce, in this case).

["Crocodile" Dundee] That's not a wing...THIS is a wing. [/Dundee]

------------------
Baker
'84 Grand Wagoneer "B.U.F.F" (Big Ugly Fat... um...Fellow)
360,727,229, 44 & 20 (3.31s), 30x9.5
If you don't know what all those numbers mean, you shouldn't be here.
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  #22  
Old 09-13-2000, 08:37 AM
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Ralph Ralph is offline
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I don't claim to be an expert, but I've been a car freak all of my life and have learned a bit about aerodynamics.

There are actually two features of later full-sized Wagoneers that other big Jeeps never had: the front spoiler and the roof spoiler. Now, we all know AMC/Jeep was a practical, if not cheap, company, and they would not have wasted $5 for these parts without good reason: these items reduced drag by managing airflow underneath the vehicle and by reducing turbulence behind the vehicle.

The primary benefit is the way big Jeeps maintain stability at highway speeds, particularly in crosswinds. A roof wing, in particular, accomplishes this by drawing the aerodynamic "center of pressure" farther back from the vehicle's true center of gravity (like a dart's feathers). It also reduces turbulence behind the vehicle by flushing high-pressure air into that low-pressure region where, conveniently, it also helps blast debris from the tailgate window.
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  #23  
Old 09-13-2000, 01:05 PM
MonsterMash
 
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I'm hardly an auto expert myself but I am a keen observer of stupid details and I have never seen one of those fins on a large vehicle without a roll-down rear window. I've never seen one on a van (except a Mr. T custom job), mini-van, Suburban with rear doors, delivery van, or VW van, or any of the SUVs with pop-up glass. They are not even present on all years of Wagoneer. Like I said, I'd like to hear Jeep's own explaination of the device.

------------------
'84GW360--"Spinner"
And on the eighth day God created Jeep so man would not be bored.
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  #24  
Old 09-13-2000, 04:34 PM
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ClarkGriswald ClarkGriswald is offline
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Join Date: Jul 03, 2000
Location: Bloomingdale MI , USA
Posts: 1,477
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Well, I wonder if there is a factory recomended angle that it is supposed to be at.. cause I dont want to be out of spec.. If I can just get one more tenth of a second I'll be golden. Hmm wonder if I should polish it in a Linear or a Radial motion?

------------------
88 Grand Wagoneer
D44's front\rear
Warn 20990 Lockouts
AMC 360
TF 727
NP 229 (Funky)
Custom Hacking Via S.P.A. (Standard Polish Archetecture)
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  #25  
Old 09-14-2000, 01:44 AM
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graham graham is offline
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Mine exits the Drivers side. Allways has and factory fitted. But the factory put the steering wheel on the other side too

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BEAR HUNTER
'82 Sportsman II,360, auto. As it rolled of the Show Room floor.
Except for;LPG conversion
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  #26  
Old 09-14-2000, 05:13 AM
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ClarkGriswald ClarkGriswald is offline
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Steering wheel on the other side?? hmm.. Ill bet some settling occured while shipping..

------------------
88 Grand Wagoneer
D44's front\rear
Warn 20990 Lockouts
AMC 360
TF 727
NP 229 (Funky)
Custom Hacking Via S.P.A. (Standard Polish Archetecture)
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  #27  
Old 09-14-2000, 06:05 AM
MonsterMash
 
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<BLOCKQUOTE>quote:</font><HR>Originally posted by graham:
Mine exits the Drivers side. Allways has and factory fitted. But the factory put the steering wheel on the other side too

<HR></BLOCKQUOTE>

G'day Graham! Is your Sportsman your guy's version of our Wagoneer? I suppose your original fuel tank was on the right side then? How about posting some pix & details so we can compare notes on our rigs?

------------------
'84GW360--"Spinner"
And on the eighth day God created Jeep so man would not be bored.

[This message has been edited by MonsterMash (edited September 14, 2000).]
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