Go Back   EcoModder Forum > EcoModding > Aerodynamics
Register Now
 Register Now

Reply  Post New Thread
Submit Tools LinkBack Thread Tools
Old 03-30-2008, 01:52 PM   #1 (permalink)
EcoModding Lurker
Join Date: Mar 2008
Location: usa
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
Front License Plate Mounting

On my 04 Camry, and many other cars, the the front license plate is mounted so that the lower portion protrudes downward from the bumper into an area directly in front of the radiator air intake. About 3 inches of plate extends below the bumper into the radiator airstream.

I am wondering if this is likely to have any significant effect, and whether it would be worthwhile to:

1. Move the license plate slightly upward so that it is entirely against the bumper and not protruding into the radiator airflow


2. Bend the bottom portion of the plate slightly so that it is angled slightly inward

I realize that the plate does not technically increase frontal area. But it must introduce a lot of turbulence. Is this likely to have any signicant, that is to say, measurable, effect?


  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

Old 03-30-2008, 02:02 PM   #2 (permalink)
Giant Moving Eco-Wall
DifferentPointofView's Avatar
Join Date: Dec 2007
Location: The Dale, IL (or A-Dale)
Posts: 1,120

The Jeep! - '95 Jeep Grand Cherokee ZJ Laredo
90 day: 23.75 mpg (US)

The Caliber - '07 Dodge Caliber R/T
90 day: 30.6 mpg (US)

The 'Scort - '98 Ford Escort LX
Thanks: 0
Thanked 7 Times in 6 Posts
maybe you could mount it so it blocks off air to the radiator.. creating a slight "grille block" effect. the cooling system accounts for about 30% of aerodynamic drag.

Yea.. I drive a Jeep and I'm on a fuel economy site, but you just wouldn't understand... "It's a Jeep thing!" *Jeep Wave*

Did I Use Too Many Abbreviations? Here's The Abbreviations List
  Reply With Quote
Old 03-30-2008, 03:53 PM   #3 (permalink)
Awesomeness personified
AndrewJ's Avatar
Join Date: Dec 2007
Location: Columbia, MO
Posts: 642

Harold - '94 Honda Civic CX
90 day: 54.51 mpg (US)

Margot - '08 Surly Big Dummy
Thanks: 0
Thanked 28 Times in 18 Posts
Send a message via AIM to AndrewJ
I don't think that moving your license plate down over your grille is going to hurt anything, but I doubt you'll see a noticeable benefit from it either.
A license plate is just too small compared to most grilles to have much effect as a grille block.
"I got 350 heads on a 305 engine. I get 10 miles to the gallon. I ain't got no good intentions." - The Drive By Truckers.

  Reply With Quote
Old 03-30-2008, 04:25 PM   #4 (permalink)
LostCause's Avatar
Join Date: Feb 2008
Location: California
Posts: 504

Thunderbird - '96 Ford Thunderbird
90 day: 27.75 mpg (US)
Thanks: 0
Thanked 7 Times in 7 Posts
I wouldn't worry too much about the turbulence issue either. I don't know of any car that tried to direct or smooth airflow through the cooling system. For that reason, the air will be turbulent in front of the radiator anyways. I suppose you could argue preventing every bit of turbulence helps, but it really would be minimal.

- LostCause
  Reply With Quote
Old 03-30-2008, 09:24 PM   #5 (permalink)
OCD Master EcoModder
brucepick's Avatar
Join Date: Dec 2007
Location: Eastern CT, USA
Posts: 1,928

Outasight - '00 Honda Insight
Team Honda
Gen-1 Insights
90 day: 58.16 mpg (US)
Thanks: 417
Thanked 386 Times in 258 Posts
I moved my plate up a bit because it was blocking the lower air intakes to radiator.
Position of plate now lines up better with the bumper, the plate intrudes less into the open air space.

That done, the cooling seems to be improved. Hopefully the aero is just a hair improved but I have no way to test it. Sorry, no pics of this mod yet.

I noticed most modern cars have no license plate bracket, just holes behind the license plate and the screws go thru the plate and right into the threaded holes. So if you want to move the plate you need to use a bracket which screws to two of the existing threaded holes. Then attach plate to the bracket. Harvest brackets from older cars at junkyards. Volvos used 'em through the mid '90's.
Coast long and prosper.
Driving '00 Honda Insight, acquired Feb 2016.

  Reply With Quote
Old 04-01-2008, 08:50 AM   #6 (permalink)
EcoModding Lurker
Join Date: Jan 2008
Location: Candia, NH
Posts: 57
Thanks: 0
Thanked 0 Times in 0 Posts
The '04 Civic uses a plastic bracket to hold the front plate on.
It screws to the bumper in front and underneath.
By removing the plate holder, turning it upside down and cutting off everything except the top (which used to be the bottom) plate mounting holes.
Then re-mounting it (upside down) the plate now goes under the bumper into the lower grill area.
Doing a little grill blocking and now it's bend backwards so it act less like a flat plow going through the air.
Looks better too.
  Reply With Quote
Old 04-01-2008, 08:56 PM   #7 (permalink)
EcoModding Lurker
Join Date: Mar 2008
Location: Speedway, Indiana USA
Posts: 56
Thanks: 0
Thanked 0 Times in 0 Posts
move to Indiana
we only got back ones

  Reply With Quote
Reply  Post New Thread

Thread Tools

Similar Threads
Thread Thread Starter Forum Replies Last Post
DIY - Front Grill Block - 1991 Honda CRX SVOboy DIY / How-to 33 06-24-2011 05:16 PM
DIY Rubber Front Wheel Skirts newtonsfirstlaw DIY / How-to 32 05-19-2011 07:45 AM
Dealing with underside airflow & the front bumper (transition radius to undertray) Daox Aerodynamics 19 03-23-2008 03:07 PM
Front VS Rear drive on electric bennelson Fossil Fuel Free 18 02-03-2008 03:10 PM

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2022, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com