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Chassis question

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janjon:
"where the front torsion attaches to the frame, that the frame ends are at least 3/8" above and below the dia of the torsion tube. That way you will get enough wrap around the TT and the fit and welding of the framerails at the taper isnt too long."

So Bruce, do you "heat-and-beat" the 3/8" overhang / underhang at the ends of the frame rails and then weld around the ends?  I could see this approach substantially reducing, if not almost eliminating, the coping and weld length of the junction of the upper and lower frame rails, depending on the relative diameters of the torsion tube and the frame rails.
 Any pics?
 

dreracecar:
Does not take that much heat to tap the .058 material. I should explain further that the end of the framerail is just a little past centerline of the TT

janjon:
Yes, I wouldn't think the frame rails would wrap all or most of the way around the TT.
Thanks for your reply, I find yours and others willingness to share your expertise and experience most interesting and informative.
Thanks again,
John

rooman:
Here it what it looks like in the process. This one as seen in the photo has a little more tubing overhang than normal as it is a "save" of a Cen-Pen car. I wanted to eliminate Worm's clumky deal with the tubes simply stacked and plated over so I coped the lower rail and laid the top one into it. With the rails being .095 wall it was going to take some work to put the notch in for the torsion bar so I left them a little long and used a hole saw, using Worm's side doubler as a guide by hose clamping it to the side of the frame--you can see it laying on the jig cross member. Normally with .058 tubing you can do the notch with a drum sander. The next step is to cut off the excess frame tubing and wrap the rest around the torsion bar tube. And you are correct John, it makes the cope (and subsequent weld) quite a bit shorter.



Roo

dreracecar:
Looking at Roo's pic you will notice the lenght of the cope, If one were to cope it more so there is no wrap it would add another 8" to the weld joint. You also dont have to do a full wrap around the TT. 1/4" past the top tube upper centerline is plenty.

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