 |
|
11-29-2009, 03:34 PM
|
 |
|
|
Join Date: Aug 09, 2000
Location: New Haven, CT
Posts: 5,568
|
|
|
Brow and aerodynamics
I used to joke about the aerodynamics of the brow in J-cabs until I put rain-X in my 63 J300's windshield and drove it in the rain with no wipers. Looking at the direcion of the droplets, you can see the airflow around the windshield. In my '97 Riviera you can see the air gracefully flowing over the windshield. In the J300...Talk about turbulence!! You would think it was put there as an air brake. 
Although I would never consider neutering my truck, it makes me wonder how much of a difference in MPG that brow makes. I'm assuming that's the reason Jeep dropped it in the 80's and that's why the Jeep Gods punished AMC a few years later! 
Any theories?
PS. By the way, my brick-like J300 gets 10% better mileage than my sleek and aerodynamic Riviera 
__________________
1969 M715, 6x6 project
1963 J300, 4BT, NV4500, NP200 D60/D70.
Last edited by Mikel : 11-29-2009 at 03:38 PM.
|
11-29-2009, 04:12 PM
|
 |
Perfesser of Jeepology
|
|
Join Date: Jun 15, 2000
Location: Carpentersville, IL 60110
Posts: 9,213
|
|
|
I'm fairly certain the aerodynamics of these things is poor enough that a brow is barely noticeable!
__________________
Jeep Grounds
RRV Homepage
Texas Full Size Jeep Association
1987 Grand Wagoneer
AMC 360/TF727/NP229
1999 Wrangler Sport
4.0L/AX-15/NV231
Quote:
|
“Freedom is never more than one generation away from extinction” by Ronald Reagan.
|
|
11-29-2009, 04:45 PM
|
 |
Fool-Injected
|
|
Join Date: Jun 30, 2003
Location: The Long Beach area, SoCal
Posts: 3,509
|
|
I'd bet it makes a relatively HUGE difference at ~50+mph.
Browed trucks look awesome though, so just throw in some ultra-low gears and you'll never have to worry about it. |
11-29-2009, 04:55 PM
|
 |
Master Mechanic
|
|
Join Date: Nov 11, 2002
Location: Jacksonville, NC 28540
Posts: 907
|
|
|
Probably all of about +/- 1 mpg... but in the 80's, they were taking one where they could get one.
I was more worried about headroom when I looked at my 86.... not an issue. I have a broken seat spring, but even when I get it fixed, I still think I might be able to get my cowboy hat on while seated.
__________________
Brad Smith
86 J10 "Barney"
360/727/208
D44/AMC 20/3.31s
past rigs -
79 Chief
80 J10
|
11-29-2009, 05:04 PM
|
 |
Master Mechanic
|
|
Join Date: Jan 03, 2008
Location: Geauga County, Ohio
Posts: 811
|
|
This reminds me of them Geico INsurance commercials, everytime I see that sulking crommagnum guy, with his uni-brow, I can't help but think of how Darwin's theory rings true, even on truck evolution.......
Somebody's gonna tar and feather me sooner rather than later.....
__________________
Breakfast amounts to one live toad, I choke that mofo down, and I am rest assured that nothing worse will happen to me for the rest of the day.
___________________________
'68 CJ5
'92 YJ
'06 Commander
|
11-29-2009, 05:35 PM
|
 |
Bleedin' Gasoline
|
|
Join Date: Jun 01, 2002
Location: Ft. Worth, TX
Posts: 2,420
|
|
I can tell you that on my Cherokee, those little droplets do quite a dance and it's rarely graceful. I think the biggest effect is the vertical nature of the grill and hood - creates a lot of dead airspace at higher speeds. Imagine a brick vs. an egg ... but I'd rather be driving the brick if another driver does something stupid.
__________________
Kerry - Raised by Jeep
"Got Altitude?"
"Trigger"
'78 Cherokee Chief WT 33X12.50 BFG A/T's, 15X8 Rockcrawlers, 4" BDS lift, TFI, NOS QT, TH400
"Sherman"
1993 4.0L Grand Cherokee, 44HD rear, 4:10's
"Roxie"
2004 Rubicon
"Moose"
2000 Ford Expedition XLT with 4.6L
|
11-29-2009, 07:09 PM
|
 |
Master Mechanic
|
|
Join Date: Apr 06, 2009
Location: McCamey, Texas GO BADGERS
Posts: 837
|
|
Quote:
|
Originally Posted by Lindel
I'm fairly certain the aerodynamics of these things is poor enough that a brow is barely noticeable!
|
That has always been my theory as well.
__________________
Dan Rowe
Quote:
|
Originally Posted by fulsizjeep
I don't think an apology is needed. Most of us are pretty opinionated even when we are wrong.
|
84 Wagoneer 4" lift 32x11.5
77 J 20 Chevy 350 35x12.5
89 Cherokee 3" lift 31x10.5
|
11-29-2009, 07:22 PM
|
 |
|
|
Join Date: Jul 30, 2003
Location: Normal, Oklahoma
Posts: 8,682
|
|
If you'd like, you can drive around with the tailgate down and pretend that is helping.
__________________
Mark B. Jones
Quote:
|
Originally Posted by GrandWag&Prix
Actually, now that I think about it, that could be either awesome or really terrible.
|
'76 401 Wagoneer
'79 Chief "Junaluska"
|
11-29-2009, 08:30 PM
|
 |
Bleedin' Gasoline
|
|
Join Date: Jan 30, 2009
Location: Franklin, NC
Posts: 2,496
|
|
I can put mine in neutral and cruise down a 5 mile mountain with 7% + grade close to my house and I won't break 55 MPH. I consider it cruise control
__________________
Justin
'72 J2000 360 4bbl T18 D20
'96 ZJ
"It's all about the fun-per-gallon vs the miles-per-gallon"-- Gamber68
Sponsored by Jake's Full-Size Jeep Junkyard
|
11-29-2009, 08:43 PM
|
 |
Murphy's Law Poster Child
|
|
Join Date: Dec 03, 2003
Posts: 10,570
|
|
__________________
You know it's bad when your car's on the EPA's 10 most wanted list!
'82 J10
|
| Thread Tools |
Search this Thread |
|
|
|
| Display Modes |
 Linear Mode
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
All times are GMT -6. The time now is 01:45 PM.
|
