View Single Post
Old 03-08-2013, 03:31 PM   #7 (permalink)
RedDevil
In the fasting lane
 
RedDevil's Avatar
 
Join Date: Dec 2012
Location: Nieuwegein, the Netherlands
Posts: 3,930

Red Devil - '11 Honda Insight Elegance
Team Honda
90 day: 52.67 mpg (US)

It - '09 Hyundai I10 Active Cool
Team Hyundai
90 day: 31.45 mpg (US)
Thanks: 1,664
Thanked 2,180 Times in 1,409 Posts
Quote:
Originally Posted by ChazInMT View Post
It has been discussed many times in the forums that smooth is only a slight benefit on the front of the car. A recessed block will give you 95% of the benefit of a smooth one. Obsess away if you wish.

It has to do with the air stacking up and sort of forming its own shape. By diverting the air around or over your car, you are sending it on a less resistive path than going through your radiator and engine bay.
Yes, and since the air just in front of the grill is moving at almost the same speed as that grill, the friction is negligible.
The higher pressure ahead is pushing the surrounding air aside and over the car, and does so almost completely frictionless.

On the other hand, recesses that are placed in the air stream like at the very edge of the bumper or the headlight area, they do have an impact and would gain from flushing.
__________________
2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
lifetime FE over 0.17 Gmeter or 0.1 Mmile.



Investors woes:
"In hindsight, I should have placed a bet on the horse that won the race"
"In hindsight, I should have bet more on that horse"
  Reply With Quote
The Following User Says Thank You to RedDevil For This Useful Post:
ChazInMT (03-08-2013)