| Shutters??? [message #243348] |
Thu, 13 March 2014 14:03  |
g.winger
Messages: 792
Registered: February 2008
Location: Warrenton,Missouri
Karma: 0
|
Senior Member |
|
|
Nascar uses tape over the grill. Volt closes off the rad. when on electric mode. The new Colorado and Canyon has them. When the Airforce was trying wing coulpling(before in flight refueling), they tried them on the fighters to reduce drag. (before disaster struck, one fighter flipped on to its back when the autopilot was switched on,killing all). Wondering if closing off 3/4 of the rad opening when the air is cool if it could reduce drag??? Wonder how much in % it could help. Wondering if I could find an old storm door to salvage the linkage??? Wondering where I'd find the time. Can't hardly use the GMC now much less work on it! just dreaming of being retired,,,,,,PL
78 RoyaleRB,,,still no dash
507 Caddy, Hubler, galvanized frame
Searching for time!!
|
|
|
|
| Re: Shutters??? [message #243431 is a reply to message #243348] |
Fri, 14 March 2014 08:06  |
 |
Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
|
Senior Member |
|
|
| g.winger wrote on Thu, 13 March 2014 15:03 |
Nascar uses tape over the grill. Volt closes off the rad. when on electric mode. The new Colorado and Canyon has them. When the Airforce was trying wing coulpling(before in flight refueling), they tried them on the fighters to reduce drag. (before disaster struck, one fighter flipped on to its back when the autopilot was switched on,killing all). Wondering if closing off 3/4 of the rad opening when the air is cool if it could reduce drag??? Wonder how much in % it could help. Wondering if I could find an old storm door to salvage the linkage??? Wondering where I'd find the time. Can't hardly use the GMC now much less work on it! just dreaming of being retired,,,,,,PL
|
Paul,
The real purpose of shutter off the grill is to reduce the airflow through the engine box. NASCAR people put tape on the grill to move the "separation zone" that divides what air goes over or under the car. This might have an effect of the CD of a Volt, but anything larger, you get back to the block coefficient. In the GMC case, I don't think you will accomplish anything.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
|
|
|
|
| Re: Shutters??? [message #243439 is a reply to message #243431] |
Fri, 14 March 2014 08:53 |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
Karma: 0
|
Senior Member |
|
|
If you look in my photos you will see an album called Hole grill or something. I had made a nice stainless grill using perferated polished stainless. It looked great, ahd about 45% open area, so about the same as stock just a different pattern.
on an 85 degree day on the highway at 50-60 the fan would come on.
I switched to an expanded metal material for the grill and no more engine fan.
I believe the wind piled up against the hole grill and couldn't get through due to the small holes. this really suprsed me since modern trucks seem to work fine with that style grill.
None the less, I don't think you want to be reducing airflow through the engine bay on these things. I want to add the air dam even to get more air in.
Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com
|
|
|
|
GMCforum
Search
Help
Register
Login
Home
