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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 09-15-2012, 01:17 AM   #1 (permalink)
EcoModding Lurker
 
Join Date: May 2011
Location: Santa Barbara, CA
Posts: 65

Buddy - '94 Acura Integra GSR
90 day: 27.02 mpg (US)
Thanks: 0
Thanked 1 Time in 1 Post
Question Questions about Radiator Block

Are there any sort of gains to be had from sticking a shield in front of the radiator? Im talking about literally just sticking a piece of plastic or something similar to block air from cooling down the water in the radiator. Reason I ask is because as I was researching this, I came across a comment someone made about the fact that the block really didn't do anything because there isn't really any water running through the radiator, the Thermostat is closed. Does the block really decrease the time for the car to get to proper operating temperature? If so, why? Thanks.
- Aaron

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 09-15-2012, 01:28 AM   #2 (permalink)
Master EcoModder
 
Join Date: Jul 2008
Location: Tallmadge, OH
Posts: 313
Thanks: 6
Thanked 26 Times in 21 Posts
rad blocks

Radiator blocks serve two or three purposes. 1) They keep cool air from entering the engine bay leading to quicker warm up. 2) The air kept out of the engine bay generally gives an aero advantage. 3) After the engine is warm, it keeps more warm air available for the engine intake--usually leading to an increase in mpg.
  Reply With Quote
Old 09-15-2012, 01:47 AM   #3 (permalink)
Smooth Operator
 
Join Date: Feb 2011
Location: dover tn
Posts: 147

Old Yellar - '79 MGB Tourer Drop-Hood Coupé
Sports Cars
90 day: 25.83 mpg (US)

Old Brown Ford - '91 Ford Bronco Custom

MAGNUM - '05 DODGE MAGNUM SXT
Thanks: 9
Thanked 15 Times in 14 Posts
it is true ... until the thermostat functions no cooling water will flow to the radiator ..

in the case of my machine i have a 195 in .. so until the temp of the water in the block reaches 195 the radiator is not in function..

in winter one often will put a block on to keep the temp up to operating temps

we always used cardboard or *winter covers * over the radiator..

modern machines have various artifices to increase temperatures

to me modern is a 1980 .. they had stoves and flappers {WAI -warm air induction }
to increase induction temps in order to reduce emissions

i have seen no indisputable results indicating that hot induction reduces MPG..
however . with my machine/test set i could easily test that ..
be advised my machine runs all analogue .. no computers .. the most complex electronic device is the alternator..

with newest machines [this century]they have some complex sensing circuitry and WAI or hot intake *might * trick the logic's to reducing the fuel flow

im not sure about any of that .. like i said i run analog and ya ain't trickin that
  Reply With Quote
Old 09-15-2012, 01:55 AM   #4 (permalink)
EcoModding Lurker
 
Join Date: May 2011
Location: Santa Barbara, CA
Posts: 65

Buddy - '94 Acura Integra GSR
90 day: 27.02 mpg (US)
Thanks: 0
Thanked 1 Time in 1 Post
Okay, that makes some sense. The shield works as a sort of insulator to keep any heat that is created moving around the bay which would lead to an increase in IAT and thus speed up the time it takes to get to operating temperature. At what point is there too much heat in the bay? How much of the Radiator should I block?
  Reply With Quote
Old 09-15-2012, 02:22 AM   #5 (permalink)
Smooth Operator
 
Join Date: Feb 2011
Location: dover tn
Posts: 147

Old Yellar - '79 MGB Tourer Drop-Hood Coupé
Sports Cars
90 day: 25.83 mpg (US)

Old Brown Ford - '91 Ford Bronco Custom

MAGNUM - '05 DODGE MAGNUM SXT
Thanks: 9
Thanked 15 Times in 14 Posts
im am not convinced at all on grill blocking .. so im the wrong guy to respond..

then i have had machines melt down and radiators explode on account of improper cooling flows ..

but in the interest of good data i would suggest a 50% block and see if you can accumulate some metrics ie: increased MPG

.. keep an eye on your fan function [ if you have electric fans] .. increase to 75% .. monitor metrics

i have seen guys here running 90% block in summer .. im not seen any metrics on any increase MPG nor any data on engine temps..
but then i have not studied the subject a whole lot

i bet you could do a search on *grill block*

and know a whole lot more
  Reply With Quote
Old 09-17-2012, 10:14 AM   #6 (permalink)
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 22,213

Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 53.56 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 61.98 mpg (US)

Fancy Metro - '14 Mitsubishi Mirage top spec
90 day: 58.72 mpg (US)

Even Fancier Metro - '14 Mitsubishi Mirage top spec
90 day: 70.75 mpg (US)
Thanks: 3,790
Thanked 6,625 Times in 3,437 Posts
It's important to distinguish between a radiator block, and a grille block:

A grille block prevents excess airflow from entering the engine compartment in the first place, diverting it around the vehicle instead. Less airflow through the engine compartment should mean more retained heat under the hood and somewhat faster warm-ups.

A radiator block - something phyiscally against the front of the radiator - does not typically do this. There's little to no aerodynamic benefit in any of the cars I've looked at. (A car with full ducting from the grille to the radiator may be an exception, but they're rare to non-existant!)

A radiator block may also hamper the ability of the cooling fan to work, since it won't be able to move the same volume of air through the radiator if things get too hot. Fan air flow volumes aren't affected by a grille block (though the air that it's moving may be warmer).

I wouldn't bother at all with a radiator block. Grille block is the way to go.
__________________
Honda mods: Ecomodding my $800 Honda Fit 5-speed beater
Mitsu mods: Oops, I did it again! Bought another cheap, 3-cylinder Mirage. Mods in progress...
Ecodriving test: Manual vs. automatic transmission MPG showdown



EcoModder
has launched a forum for the efficient new Mitsubishi Mirage
www.MetroMPG.com - fuel efficiency info for Geo Metro owners
www.ForkenSwift.com - electric car conversion on a beer budget
  Reply With Quote
Old 09-17-2012, 03:28 PM   #7 (permalink)
EcoModding Lurker
 
Join Date: May 2011
Location: Santa Barbara, CA
Posts: 65

Buddy - '94 Acura Integra GSR
90 day: 27.02 mpg (US)
Thanks: 0
Thanked 1 Time in 1 Post
Interesting. I'll keep an ear out to see if the fan comes on. I'd say the rad. block is about 75% or so. So are you saying there is no benefit to just a radiator block? I think what was said above made sense as far as the block working as an insulator and the intake using the warm air created from the exhaust header. Anyone find numbers yet?
  Reply With Quote
Old 09-17-2012, 03:33 PM   #8 (permalink)
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 22,213

Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 53.56 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 61.98 mpg (US)

Fancy Metro - '14 Mitsubishi Mirage top spec
90 day: 58.72 mpg (US)

Even Fancier Metro - '14 Mitsubishi Mirage top spec
90 day: 70.75 mpg (US)
Thanks: 3,790
Thanked 6,625 Times in 3,437 Posts
A radiator block offers fewer benefits and additional drawbacks to a grille block, so why not just do a grille block!

Do a behind-the-grille block if you're concerned about aesthetics. (Then construction difficulty is the only drawback.)

__________________
Honda mods: Ecomodding my $800 Honda Fit 5-speed beater
Mitsu mods: Oops, I did it again! Bought another cheap, 3-cylinder Mirage. Mods in progress...
Ecodriving test: Manual vs. automatic transmission MPG showdown



EcoModder
has launched a forum for the efficient new Mitsubishi Mirage
www.MetroMPG.com - fuel efficiency info for Geo Metro owners
www.ForkenSwift.com - electric car conversion on a beer budget
  Reply With Quote
Reply  Post New Thread


Tags
grill block, radiator, radiator block, thermostat

Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com