View Single Post
Old 06-04-2013, 04:13 PM   #19 (permalink)
In the fasting lane
RedDevil's Avatar
Join Date: Dec 2012
Location: Nieuwegein, the Netherlands
Posts: 3,964

Red Devil - '11 Honda Insight Elegance
Team Honda
90 day: 52.11 mpg (US)
Thanks: 1,688
Thanked 2,203 Times in 1,427 Posts
I find the grill block starts to affect FE negatively long before the fans kick in.
The reason is air intake temp.
The Insight has its air intake behind the rads, but it takes in fresh air from a snorkel above the rad.
The grill block means very little air flows to the rad, so when it gets hot the heated air rises up to the snorkel rather than flow through. While a hot air intake can give good benefits, it does not work fine combined with an EGR as the recycled exhaust gas obviously is also quite hot.

On cars that do not have an EGR and work well with a hot air intake, it may well be so that the benefit of a grill block has more to do with raising the intake air temp than with actual lower air resistance...
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