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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 09-24-2009, 02:30 AM   #61 (permalink)
Master EcoModder
 
Join Date: Feb 2008
Location: belgium
Posts: 663

vectra a - '95 Opel Vectra GLS
90 day: 37.51 mpg (US)
Thanks: 14
Thanked 60 Times in 43 Posts
chuckm,

i think this was discussed before in my "mesh grillblock" thread, but unfortunately there's not much to be gained it seems from a perforated grillblock... the sum of all the holes would basically be the size of your air intake

aerohead

i did some quick measurements on a picture and found the combined grill opening of my car is still roughly 30% of the total grill area. the lower openin is about 16% or 1/6 th ! of the total grill, the top grill (wich has a partial grillblock from the factory) is about 14%.

the original grill duct was not very well sealed however as there where structural(?) holes in the suport beams wich connected the pre radiator cavity to the underside of the car (however my curent undertray seals this of)

__________________
aer·o·dy·nam·ics: the science of passing gass

*i can coast for miles and miles and miles*
  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 09-24-2009, 08:47 PM   #62 (permalink)
OCD Master EcoModder
 
brucepick's Avatar
 
Join Date: Dec 2007
Location: Eastern CT, USA
Posts: 1,909

Outasight - '00 Honda Insight
Team Honda
Gen-1 Insights
90 day: 59.79 mpg (US)
Thanks: 400
Thanked 361 Times in 245 Posts
This is my Civic.
This is thin lauan plywood, primed and painted.
The wire loops going back into the grill are a bit ghetto but I'm good with it.

Been meaning to redo this in plexiglass so you can see the "H" logo but other projects keep getting in line ahead of that.



My lower grill is about 2/3 blocked. Never had to open it up any more than that all summer, including using a/c on occasion. In winter I'll probably have the lower grill about 80-90% blocked.
__________________
Coast long and prosper.
Driving '00 Honda Insight, acquired Feb 2016.


  Reply With Quote
Old 09-26-2009, 02:14 PM   #63 (permalink)
Master EcoModder
 
aerohead's Avatar
 
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 10,856
Thanks: 17,144
Thanked 5,815 Times in 3,505 Posts
30%

Quote:
Originally Posted by lunarhighway View Post
chuckm,

i think this was discussed before in my "mesh grillblock" thread, but unfortunately there's not much to be gained it seems from a perforated grillblock... the sum of all the holes would basically be the size of your air intake

aerohead

i did some quick measurements on a picture and found the combined grill opening of my car is still roughly 30% of the total grill area. the lower openin is about 16% or 1/6 th ! of the total grill, the top grill (wich has a partial grillblock from the factory) is about 14%.

the original grill duct was not very well sealed however as there where structural(?) holes in the suport beams wich connected the pre radiator cavity to the underside of the car (however my curent undertray seals this of)
So at 30% it DOES look like you have some wiggle room on the opening if you can get the inlet air-tight.--------- As an aside,the Porsche 928 went from an engine-driven fan to 2-variable-volume electric fans along with thermostatically-controlled radiator shutters for better warmup/emissions/mpg,if the "passive" system proves to weird,perhaps Porsche's tech might be worth a look.-------------- P.S. it's the science of passing gas "stations"! Just messin' with you.
  Reply With Quote
Old 09-27-2009, 04:48 AM   #64 (permalink)
Master EcoModder
 
Join Date: Feb 2008
Location: belgium
Posts: 663

vectra a - '95 Opel Vectra GLS
90 day: 37.51 mpg (US)
Thanks: 14
Thanked 60 Times in 43 Posts
Quote:
So at 30% it DOES look like you have some wiggle room on the opening if you can get the inlet air-tight.
it's fairly tight as it is, but (there's always a but) my engin air pickup goes trough the front bulkhead into be area behind the bumper wich is an extention of the area in front of the radiator... so it's fed by the grill.

i have been looking into making an air extraction duct behind the grill. i wouldn't be able to get it perfectly sealed becouse a lot of ducts running there, but i could greate a path to extractor louvres in the undertray
__________________
aer·o·dy·nam·ics: the science of passing gass

*i can coast for miles and miles and miles*
  Reply With Quote
Old 09-30-2009, 06:07 PM   #65 (permalink)
Master EcoModder
 
aerohead's Avatar
 
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 10,856
Thanks: 17,144
Thanked 5,815 Times in 3,505 Posts
extractor

Quote:
Originally Posted by lunarhighway View Post
it's fairly tight as it is, but (there's always a but) my engin air pickup goes trough the front bulkhead into be area behind the bumper wich is an extention of the area in front of the radiator... so it's fed by the grill.

i have been looking into making an air extraction duct behind the grill. i wouldn't be able to get it perfectly sealed becouse a lot of ducts running there, but i could greate a path to extractor louvres in the undertray
It would be nice if all cars had a complete pressure profile of the body included in the owner's manual.
  Reply With Quote
Old 10-01-2009, 02:17 AM   #66 (permalink)
Master EcoModder
 
Join Date: Feb 2008
Location: belgium
Posts: 663

vectra a - '95 Opel Vectra GLS
90 day: 37.51 mpg (US)
Thanks: 14
Thanked 60 Times in 43 Posts
Quote:
It would be nice if all cars had a complete pressure profile of the body included in the owner's manual.
or at least on the website... but when will that happen, most don't even give the Cd let alone the frontal area
__________________
aer·o·dy·nam·ics: the science of passing gass

*i can coast for miles and miles and miles*
  Reply With Quote
Old 12-05-2010, 07:48 PM   #67 (permalink)
EcoModding Apprentice
 
Join Date: Oct 2010
Location: South Of Chicago
Posts: 127

Aveo - '08 Chevolet Aveo LS
Thanks: 6
Thanked 1 Time in 1 Post
Could you not technically do a grill shield, as you describe, and pipe the intake of the car up to the radiator, drawing air through the radiator cooling the engine?
  Reply With Quote
Old 12-06-2010, 02:09 AM   #68 (permalink)
Master EcoModder
 
Join Date: Feb 2008
Location: belgium
Posts: 663

vectra a - '95 Opel Vectra GLS
90 day: 37.51 mpg (US)
Thanks: 14
Thanked 60 Times in 43 Posts
you mean have the engine intake draw air trough the radiator, and as such create an extra warm air intake?

it sounds like an appealing idea, but i imagine the radiator restricts airflow quite a bit so while an intake inlet befor the rad wil benefit from high pressure, the intake behind it will suffer from flow restriction wich is not good for the engine performance.
__________________
aer·o·dy·nam·ics: the science of passing gass

*i can coast for miles and miles and miles*
  Reply With Quote
Old 12-15-2010, 10:56 AM   #69 (permalink)
EcoModding Apprentice
 
Join Date: Oct 2010
Location: South Of Chicago
Posts: 127

Aveo - '08 Chevolet Aveo LS
Thanks: 6
Thanked 1 Time in 1 Post
if you used some kind of expanding funnel between the air intake pipe and the radiator, it could work.
  Reply With Quote
Old 12-16-2010, 06:49 PM   #70 (permalink)
Master EcoModder
 
Join Date: Jan 2009
Location: Maui, Hawaii
Posts: 813
Thanks: 5
Thanked 34 Times in 26 Posts
I don't think getting the engine to suck in less dense air by feeding it HOT air is a good idea.

  Reply With Quote
Reply  Post New Thread


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Permanent Aluminum Grill Block and Belly Pan Markmysite EcoModding Central 41 02-27-2014 09:22 PM
Lower Grill Block 2005 Honda Civic Arminius EcoModding Central 12 10-04-2011 12:31 AM
Spring mounted Grill Block cfg83 EcoModding Central 32 04-19-2009 06:00 PM
Airdam and grill block on the Mirage BrianAbington Aerodynamics 5 10-15-2008 06:54 PM
96-00 Civic Upper Grill Block Impulse Aerodynamics 2 07-12-2008 03:09 PM



Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com