Front bumper shape - Page 4 - Fuel Economy, Hypermiling, EcoModding News and Forum

Cd · 11-19-2011, 06:48 PM

Here is my 'dead horse' that I keep bringing up from time to time.
This is proof that you can have a blunt 'barn door' front end and still have good aero.

This old '80 Camaro got down to a wind tunnel tested .201 Cd - or just over what the EV-1 achieved.

Chevy Camaro Aerodynamics Side View Photo 7

Also look at the attached flow with the 'barn door' flat front end on this '32 Coupe :

Cd · 11-19-2011, 07:16 PM

Here is another '32 coupe - this one quite draggy by the looks of the smokestream.

Still, this video gives a good idea of how that a simple rounded edge can keep attached flow - for example along the roofline.

winkosmosis · 11-19-2011, 07:57 PM

.201 even with that massive scoop??

Frank Lee · 11-19-2011, 08:37 PM

Quote:

Originally Posted by Cd

It would certainly be interesting to see a tuft test along the sides of those fenders Frank.

Its hard to tell without tufting it though.

( I hope you do get around to fixing that front end ! Good luck passing inspection without the turn signal lights )

It would be fun to tuft test vs one of my "complete" cars.

There are no inspections. There are turn signal lights.

Cd · 11-20-2011, 01:11 AM

Quote:

Originally Posted by winkosmosis

.201 even with that massive scoop??

" We did lots of hoodscoop testing with Harwood's scoop part numbers (left to right) 3161, 3164, and 3182 borrowed from Barnett Performance. We also tried our old 6-inch cowl hood and a bone-stock flat hood we borrowed from Camaro Specialty and taped all the scoops in place on that hood. All the scoops were swoopiest when extended back to the windshield. Believe it or not, the cowl and the PN 3182 aero scoop had the very same Cd as the flat hood, and the other two scoops were just 10 counts worse. Better yet, the ram-air of the aero scoop was estimated to give us 24 hp at 250 mph. "

Read more: Chevy Camaro Aerodynamics Hoodscoop Photo 5

skyking · 11-20-2011, 09:35 AM

Frank, your Tempo pic reminds me of the truck grille I have not finished yet.
I get to make a scratch bumper for the truck, and I've been watching this thread. Thanks for all the good info. It looks like I need to build something resembling Jay Leno's chin, yet tasteful. Seems like a tall order to me

Quasimoto · 11-21-2011, 08:25 AM

While this is for the nose of a streamliner; it is still quite interesting.

http://www.aussieinvader.com/wp-cont..._design_dm.pdf

Sven7 · 11-21-2011, 09:40 AM

Quote:

Originally Posted by Cd

Also look at the attached flow with the 'barn door' flat front end on this '32 Coupe :

Frank Lee · 11-21-2011, 01:01 PM

People continue to fixate on the front when the top of the windshield on back is where it's at.

kach22i · 11-21-2011, 01:51 PM

Quote:

Originally Posted by Quasimoto

While this is for the nose of a streamliner; it is still quite interesting.

http://www.aussieinvader.com/wp-cont..._design_dm.pdf

Very interesting.

Looks like you have a choice of safe and slow, or fast and air-born.

11-20-2011, 09:35 AM	#36 (permalink)
skyking Master EcoModder Join Date: Apr 2011 Location: Tacoma WA Posts: 1,399 Woody - '96 Dodge Ram 2500 SLT Team Cummins 90 day: 23.82 mpg (US) Avion and Woody - '96 Dodge/Avion Ram 2500/5th wheel combo 90 day: 15.1 mpg (US) TD eye eye eye - '03 Volkswagen Beetle GLS 90 day: 49.05 mpg (US) Mule - '07 Dodge Ram 3500 ST Thanks: 743 Thanked 528 Times in 344 Posts	Frank, your Tempo pic reminds me of the truck grille I have not finished yet. I get to make a scratch bumper for the truck, and I've been watching this thread. Thanks for all the good info. It looks like I need to build something resembling Jay Leno's chin, yet tasteful. Seems like a tall order to me __________________ 2007 Dodge Ram 3500 SRW 4x4 with 6MT 2003 TDI Beetle 2002 TDI Beetle currently parked - 1996 Dodge 2500 Cummins Turbodiesel Custom cab, auto, 3.55 gears

11-21-2011, 01:01 PM	#39 (permalink)
Frank Lee (: Join Date: Jan 2008 Location: up north Posts: 12,762 Blue - '93 Ford Tempo Last 3: 27.29 mpg (US) F150 - '94 Ford F150 XLT 4x4 90 day: 18.5 mpg (US) Sport Coupe - '92 Ford Tempo GL Last 3: 69.62 mpg (US) ShWing! - '82 honda gold wing Interstate 90 day: 33.65 mpg (US) Moon Unit - '98 Mercury Sable LX Wagon 90 day: 21.24 mpg (US) Thanks: 1,585 Thanked 3,555 Times in 2,218 Posts	People continue to fixate on the front when the top of the windshield on back is where it's at. __________________

11-19-2011, 07:16 PM	#32 (permalink)
Cd Ultimate Fail Join Date: Feb 2008 Location: Austin,Texas Posts: 3,585 Thanks: 2,872 Thanked 1,121 Times in 679 Posts	Here is another '32 coupe - this one quite draggy by the looks of the smokestream. Still, this video gives a good idea of how that a simple rounded edge can keep attached flow - for example along the roofline.

11-19-2011, 07:57 PM	#33 (permalink)
winkosmosis Master EcoModder Join Date: Jan 2009 Location: Maui, Hawaii Posts: 813 Thanks: 5 Thanked 34 Times in 26 Posts	.201 even with that massive scoop??

11-21-2011, 08:25 AM	#37 (permalink)
Quasimoto Quasi-Modder Join Date: May 2010 Location: DeForest, Wisconsin Posts: 144 Thanks: 23 Thanked 25 Times in 12 Posts	While this is for the nose of a streamliner; it is still quite interesting. http://www.aussieinvader.com/wp-cont..._design_dm.pdf