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As Alan said - the later CMCs came with a substantial steel perimeter frame --- you can see it in the build manuals in the library. As far as I know all FF/CMC came with it (doors actually bolt to it too). If you look at bodies that Rusty Tubs sells --- it is a separate purchase (to allow for use of a custom tube frame). If your's does not have the frame that's in manual -- then yeah, body needs it or you'll die fixing stress cracks. I would add steel to support the rear. I used a 1/4 x 2" 48" strip either side per a recent write up on the forum.
Mat:

I'm assuming you have a CMC/Fiberfab body, so, if you don't, please let us know.

Since it's well neigh impossible to remove the CMC fiberglass shell from the body's steel frame, I can only assume that your question was "What should I do to the pan before the body is installed"?

Nothing.

And don't be scared by some of the trash-talking on here about a pan based Speedter being weaker or more flexible (in a bad way) than a "Frame Based" speedster. I have a CMC with the "normal" sub-frame body and I've taken the time to test the hypothesis and have the pictures (and track time) to prove that it doesn't make any difference.

Just clean up the pan, replace anything rusted, get the brake system (both juice and e-brake) working, maybe even mount your seat glides and then get that body mounted and forge ahead. If you need to ask questions, then email Dr. Clock or me and we'll help you right out. It ain't as bad as it looks....

Gordon
The Speedtah Guy from Beaufort (now hiding out in New England for the Summer)
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