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View Full Version : Body mounts to eliminate Avanti hog troughs



grobb284
12-18-2006, 06:33 PM
Here are some photos of two of the larger body mounts to eliminate the rusted out hog troughs on an Avanti body. This should save the expense of replacing the hog troughs.

You can see we also left clearance for the chambered exhaust to act as a side pipe, but hidden underneath the rocker panel. We are hoping this eliminates a great deal of heat from under the floor pan.

The opening within the supports should allow brake lines and fuel lines to pass through the body mounts and lay along the main frame members.

This is a rearward view of the new body mounts.
http://shutter08.pictures.aol.com/data/pictures/09/009/33/9F/F9/39/SucJuHRuPGLjy5hCqsAJbJhGruCK1v6t01E0.jpg


This is a forward view of the new body mounts. The mount closest to the rear is sufficient for tying into the roll bar.
http://shutter08.pictures.aol.com/data/pictures/08/003/3B/77/75/79/ATZxCfxIMvoJn6YpuXki8L628kQquYqy01E0.jpg


This is a forward view of the new body mounts with a standard factory style mount laid beside it (it is the one with the hole in it, much lower and smaller).

http://shutter07.pictures.aol.com/data/pictures/08/001/6B/EE/0A/18/CCw4T20-eYkA1P8H8h7MTvmdMBf0J04o01E0.jpg

JDP
12-18-2006, 07:13 PM
I wonder if that'll be a satisfactory replacements for the hog troughs since they are bonded to the fiberglass sills and floors to brace the area between the wheels. Even the Studebaker hard tops and rag tops have a similar rocker boxes to stiffen the structure.
If larger body mounts were the answer, I think Studebaker would have save the expense of rocker boxes and hog troughs. I'm far from a expert on such things though, just tossing out a idea.

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JDP
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sbca96
12-19-2006, 02:16 AM
I have to agree with JDP on this one. The hog troughs run the length
of the door, stiffening the body, and spreading the load. I think you
will end up with stress cracks in the body at each of the two mounts.
You could still save weight, and run the exhaust there, if you made a
set of 6061-T6 boxes to attach in multiple areas along the floor, and
the ends open for the exhaust. Heat will be an issue though. One way
you might be able to save your current design, is by creating a long
support bar that bonds, or mounts at multiple spots, that bolts to the
two mounts you show. Though ... not being a box - it will flex.

Tom

'63 Avanti, zinc plated drilled & slotted 03 Mustang Cobra 13" front disc/98 GT rear brakes, 03 Cobra 17" wheels, GM alt, 97 Z28 leather seats, soon: 97 Z28 T-56 6-spd, Ported heads w/SST full flow valves, 'R3' 276 cam, Edelbrock AFB Carb, GM HEI distributor, 8.8mm plug wires

DEEPNHOCK
12-19-2006, 07:44 AM
I think it will be fine.
Looking at the frame itself, the torsional rigidity built into this frame is light years beyond what Studebaker patched together (not saying that as a slam, but as a reality check;)). Normally I would think that body flex would be an issue, but that boxed frame will be way stiffer than a sheet metal box 'glassed to the body. They might want to 'glass in a plate to the body just to spread the bolt stress around a bit. Looking forward to seeing it all done.
Jeff[8D]


quote:Originally posted by JDP

I wonder if that'll be a satisfactory replacements for the hog troughs since they are bonded to the fiberglass sills and floors to brace the area between the wheels. Even the Studebaker hard tops and rag tops have a similar rocker boxes to stiffen the structure.
If larger body mounts were the answer, I think Studebaker would have save the expense of rocker boxes and hog troughs. I'm far from a expert on such things though, just tossing out a idea.
JDP


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grobb284
12-19-2006, 11:10 AM
[quote]Originally posted by DEEPNHOCK

I think it will be fine.
Looking at the frame itself, the torsional rigidity built into this frame is light years beyond what Studebaker patched together (not saying that as a slam, but as a reality check;)). Normally I would think that body flex would be an issue, but that boxed frame will be way stiffer than a sheet metal box 'glassed to the body. They might want to 'glass in a plate to the body just to spread the bolt stress around a bit. Looking forward to seeing it all done.
Jeff[8D]

Thanks Jeff.

You are indeed correct, we are going to spread the force around, using small plates to obtain a larger surface area with the fiber glass.

This will work just fine.

By the way, the frame can be built with either body mounts, those for the hog troughs, and those not wishing to utilize hog troughs.

I have elected not to utilize the hog troughs on this one, though.[8D]

Dick Steinkamp
12-19-2006, 11:14 AM
I think Jeff's got it. The Studebaker frame was originally designed as a flexible part of the suspension (much like Chevrolet did in the early 50's). When technology and the industry moved beyond this approach, Studebaker most likely couldn't due to finances and did the best they could for their new sports car with a beefed Lark frame and extra stiffening in the body to try to give the car some rigidity. Corvette's body (and the body of other true body on frame vehicles) was simply "perched" on the frame...the frame provided all the rigidity. It looks like that is what grobb has done here. Not just made better hog troughs...but eliminated the need for them.

I love the details...like the radius's in the body mounts. [:p]. Very nicely done. Keep us posted.



http://static.flickr.com/140/326548308_6bc94ec0f3_m.jpg
Dick Steinkamp
Bellingham, WA

grobb284
12-20-2006, 11:22 AM
Thanks for the kind words, Dick.

Most people don't pick up on things like the different radii, or the pass through opening for the brake and fuel lines. Thanks for being observant, it makes this more worthwhile.

Best regards. Merry Christmas.