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For those with pickups or similar with full belly pans...?
For those of you who have built a full belly pan for your pickup or similar large vehicle, have you blocked out the rear wheel wells on the inside where the gap between the bottom of the vehicle and the top of the belly pan is sealed off? Or do you leave this area open to let air escape?
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Heat management is nontrivial when belly-panning a truck/SUV/Van. The biggest worry I have is about trapping heat from the exhaust, creating an oven. I don't pan under my exhaust for that reason.
In the area you are concerned with, most of these vehicles have a solid/live axle in this area. On my 4Runner, my plans are to omit the belly pan at/under the axle, restarting the belly pan immediately after the axle to cover the spare tire with a radiused leading edge. This is the next piece I need to build for my 4Runner. I have seen some designs that plate under the axle using flexible materials, but trying to also seal that on the sides would be very difficult. Also many vehicles of this sort have exhaust traveling up and over the axle, so I wouldn't suggest putting a pan under or beside that. |
https://ecomodder.com/forum/member-f...bonnevette.jpg
This example isn't a truck, but the side plates on the diffuser bell outward the width of the rear tire, separating the wheelwell turbulence and forcing it outward instead of mixing with the underbody flow. The bell shape accelerates the underbody flow irrespective of how smoothened it might be. |
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A pan to the front edge of the drive axle sounds reasonable.
We’ve somewhere the comment that expanded metal sheet has “enough” to qualify in this job. I’ve been thinking that conveyor belt air dam and side skirts is the more easily attained aero mod. . |
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I wish I had taken more pictures. The shape isn't obvious from that angle. It curved from close inside the wheel to the outer face. This divergent bell was tested in CFD by another member of this forum. I may have time to find that later. |
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Diffuser vanes are something I've considered adding in the future. But that's not the area I'm concerned about currently. I guess I didn't explain very well. So here are a couple of pictures about the area I'm talking about. In these pictures behind the tire at the top is the inside of the wheel well. On the bottom left, you can see the framing and coroplast of my belly pan which is attached to the bottom of the body panels. I'm trying to decide if it's worth it or needed to extend the wheel well walls down to the level of the belly pan...as much as can be done around the suspension. Just wondering what others with larger vehicles and gaps like this have done. Thanks!
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If someone with a larger vehicle that has done something chimes in, then great. But aero principles are scalable, the wheelwell is a localized feature. The solution will depend on the use case and [$$$]. A lateral wall will be more disruptive than a longitudinal one. The 'Bonnevette' had a curved plowshare shaped one. The bottom of the fender could have speed holes in it. Alternatively, you could fabricobble a fender skirt. |
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If I were to make it back, that car prolly wouldn't be there, so here's another example. The front fender of the Aston Martin Valkyrie.
https://sf1.viepratique.fr/wp-conten...o-geneva-1.jpg https://sf1.viepratique.fr/wp-conten...o-geneva-1.jpg |
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