03-21-2014, 03:28 AM
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#1 (permalink)
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EcoModding Apprentice
Join Date: May 2012
Location: United States
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Grill block behind or in front of grill?
I see some grills blocked behind the grill. It looks less obvious then something covering the out side. Does behind the grill make aerodynamics worse? Or is it so small it does not matter. Sc
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03-21-2014, 11:01 AM
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#2 (permalink)
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Master EcoModder
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probably so small it doesn't matter.
But here is how to think about it.
1. You wont do one on the outside ----- ZERO gain
2. you will do one on the inside----------SOME gain
not a tough decision.......
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03-21-2014, 11:28 AM
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#3 (permalink)
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Master EcoModder
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I Like mine on the outside. It's 3 sections of pipe insulation, 92 cents and a lot left over.
The top grille is stock.
regards
Mech
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03-21-2014, 12:04 PM
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#4 (permalink)
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Cyborg ECU
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Whenever behind the grill is good, in front is gonna be better. But the difference will be minor, probably. Mine are in front.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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03-21-2014, 12:24 PM
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#5 (permalink)
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EcoModding Apprentice
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Quote:
Originally Posted by California98Civic
Whenever behind the grill is good, in front is gonna be better. But the difference will be minor, probably. Mine are in front.
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this makes sense to me
Quote:
Originally Posted by mcrews
probably so small it doesn't matter.
But here is how to think about it.
1. You wont do one on the outside ----- ZERO gain
2. you will do one on the inside----------SOME gain
not a tough decision.......
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great point 
this really doesn't look too bad (or hard to do)
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1991 Geo Metro 1.0 3/5 base
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1994 F-350 7.3 TurboDiesel (Rollin' Coal)
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03-22-2014, 04:35 AM
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#6 (permalink)
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Too many cars
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Mine's in front of the grill. I'd be surprised if there was a difference in front versus behind. But in front of the grill is easier to install, easier to adjust and will be pushed towards the grill by air pressure. If it's behind the grill, the air pressure could push it away from the grill if it's not adequately secured, allowing air to get by it. Which might not be a bad thing. It's at highway speeds that I have to open up my grill block more.
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03-22-2014, 01:35 PM
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#7 (permalink)
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Master EcoModder
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in front/behind
Quote:
Originally Posted by SmellyCat
I see some grills blocked behind the grill. It looks less obvious then something covering the out side. Does behind the grill make aerodynamics worse? Or is it so small it does not matter. Sc
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Going out on a limb here,having the valve behind the grille allows infinite styling opportunities and fixed aerodynamic exterior architecture for the automaker without inhibiting the efficacy of the interior valve.
If the 'shutter' is exposed,and ahead of the leading edges, when in transition,it could have some orientation at which it aggravates the airflow.
You'll notice that Yakolev and Lockheed used 'behind' "shutters".
http://upload.wikimedia.org/wikipedi...-52_engine.JPG
http://www.sr-71.org/blackbird/j-58/j58image1.jpg
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Last edited by aerohead; 03-22-2014 at 01:37 PM..
Reason: add sr-71
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03-24-2014, 02:36 PM
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#8 (permalink)
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Got MPG?
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My full upper grill is permanent, it was mounted in front of the grill, but it got so plastered with bugs etc, it looked awful even in black. So I took the time and mounted it behind the grill. I saw zero difference in fuel consumption in front or behind.
My lower partial grill block is mounted in front of the grill. It's only for cooler months. Since I have a full chin-to-radiator pan I can't access the rear of the lower grill for securing zip ties so I just mount it from the front allowing a 2 snip removal when needed.
I have a 99% block on the Buick mounted to the front as that was easiest to accomplish. The bottom is full open.
The Suburban has a 50% plastic mesh inserts meant to filter out bugs, also mounted in front.
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2013 Honda Civic Si - 2.4L
OEM front to back belly pan from the factory.
Last edited by LeanBurn; 03-27-2014 at 11:55 AM..
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03-27-2014, 02:14 AM
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#9 (permalink)
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is not covered in bees.
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I don't recall seeing direct comparison testing of this before, but I'll agree with the others; it's probably not a big difference, but it's probably a lot easier to get a more air-tight seal in front of the grill than behind (or even better, flush with the outermost bodywork).
I prefer in front, both for ease of construction and air-seal reasons. (I also am fine with drilling holes in plastic bodywork and having sheet metal and screws/rivets visible on my car; looks are not a high priority for me).
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