Old bed liner for belly pan

[ngrimm]

In the spirit of waste not want not I have been toying with ideas of a Kammback for my Bronco II using wheel wells from the old bed liner. I can piece two halves together together to make one piece. I have no idea if the angles would be right. First two pics I had one direction and the next two I turned it around. I know I know the tire has to go

[piers.singer]

Haha! I do like the Kamm-back idea, you're one resourceful chap Of course, I think that a smoother angle would be much more effective, however, your simple idea may allow a small amount of flow re-attachment. Also, it should go some way to reducing flow spilling onto the spare, so you may well see and/or feel some improvements. A-B-A tests will be necessary for hard evidence, so get that MPGuino calibrated

All in all, a great little project you have there. Keep up the good work.

[ngrimm]

I'm thinking of using it in the direction of photo #4 and cutting the front so the top angle matches the top of the hatch. Then cut the bottom off at about 45*. I saw a pic of a Kammback on a minivan somewhere and I thought that was what it looked like. Could be a total wasted of time for all I know.

[puddleglum]

Waste not want not is a great motto and I think you've done a good job on repurposing the bed liner for your pan and front air dam. But, IMO, I think your trying too hard by trying to use the wheel wells for a kammback. It just doesn't look like the right shape to me to be effective, judging from what others have done. Here's a suggestion (hope you don't mind), why not see if you could use the wheel wells to make some rear wheel covers and maybe something to smooth the air flow around the tires. I suspect you will see more benefit for your effort from that. Building a kammback is a good idea, I just think that the wheel wells are not the best choice for material. Good luck on you project.

[ngrimm]

I appreciate any advice since I am new to this. After reading the following topic it appears that a box like my Bronco II probably would need a full boat tail to see much improvement.
http://ecomodder.com/forum/showthrea...box-14168.html

[euromodder]

Originally Posted by ngrimm

I appreciate any advice since I am new to this. After reading the following topic it appears that a box like my Bronco II probably would need a full boat tail to see much improvement.

Search for the streamlining template on ecomodder.
That's the shape you want to approximate with the extension.
The better you match the template's angles (in both plan and side-views), the better it'll work.
But even when done crudely with flat plates, it'll work to some extent.

Obviously, in the real world it'd get too long to be practical, so you need to cut off the streamline extension.
The cut-off at the rear should be sharp and abrupt so the air separates as cleanly as possible.

Search for other folks' Kammback (or Kamm-back).


Reusing things is OK, but I think you're stretching it a bit

[ngrimm]

Thank you for that. After looking at the templates I realized that the Bronco might be more efficient driving in reverse Anyway I have moved on to trying to direct the air around the front tires. Then maybe some side skirts?

[ngrimm]

I cut out a couple flat bedliner pieces and used a heat gun to mold them for front fender flares Probably need a support to keep them flared out in direct sunlight. They're quite rigid after they cool.

[euromodder]

Originally Posted by ngrimm

I cut out a couple flat bedliner pieces and used a heat gun to mold them for front fender flares

Way to go.
Not perfect, but it'll do better than what you started out with


If you make sideskirts, you can make them do double duty as rear-wheel flares.


Some ideas :
Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - aerohead's Album: Pickup images

[lunarhighway]

here's a few more idea's you might considder,


the green dams would have most effect along with possibly some sort of side skirts. measuring the height of these dams on normal vehicles could give you an idea on minimum ground clearance for normal driving

making the wheel wells more tight would also cut some turbulence as would adding smooth hubcaps. rounding the A pillars could help to, although that's a bit speculative.

anyway, just a little fun i had after seeing your great work.