panic

Wouldnt be a good idea to weld in a second (round tube or boxed steel) crossmember just after (or before) the mid crossmember, to strengthening the frame?

Any frame connectors specifically for C3 chassis professionally built out there?

Burnt71

Not much room , I'm not sure thats where the strength is needed , but sounds like a good idea.

0Road-Race Vette

I have the answer for you. It is called a roll bar. A six point roll bar will take care of any flex issues (especially the area right in front of the rear kick ups).ever see a vette with some horse power accelarate and the door gap opens up?. Along with that ,racers will weld specific areas of the frame up for extra strength, and I know it sounds basic but make sure your body mounts are in great working order. Here are some examples, convertible and coupe..The side bars of the coupe were put there for driver easy access.The back window can still be taken out!!!!

panic

[QUOTE=Road-Race Vette;1562397611]I have the answer for you. It is called a roll bar. A six point roll bar will take care of any flex issues (especially the area right in front of the rear kick ups).ever see a vette with some horse power accelarate and the door gap opens up?. Along with that ,racers will weld specific areas of the frame up for extra strength, and I know it sounds basic but make sure your body mounts are in great working order. Here are some examples, convertible and coupe..The side bars of the coupe were put there for driver easy access.The back window can still be taken out!!!!

well yes, it would be like a 'reverse open air crossmember'...
would you fab a custom 6 point cage for my '77 and ship it with a CHEAP freight?

0Road-Race Vette

[QUOTE=panic;1562398908]No, it needs to be fitted to the car.

vette8121

Tom's Differential sells a pre-cut 4 piece weld on kit for C 3's.....TM

427Hotrod

I think a mid motor plate would stiffen the car tremendously. The weakest part of the frame is the long space between the front crossmember and the trans crossmember. I've also seen a few cars with a bolt in *X* crossmember under the trans etc.


JIM

toddalin

Was it you asked about this before?

As I noted, get a copy of the "Chevrolet Power Manual", 5th Edition, 1986.

The whole of Chapter 6 is devoted to "Corvette Chassis Preparation" (based on the C3) and tells where to strengthen the frame, where to add gussets, where and how to weld the seams, where to weld plates, and the optimum places to attach a roll bar/cage. It also tells how to set up the suspension, blueprint the engine, best parts to use, etc.

I think the "General" did an excellent job on this and the information is far more comprehensive (and on-point) than anything that you will ever get over the CorvetteForum.

TheSkunkWorks

With a 6-point or less, it would seem even more important to add triangulation in the floor plane of the chassis, such as TT's tranny X-member bracing...

mpettus

[QUOTE=toddalin;1562405100]
As I noted, get a copy of the "Chevrolet Power Manual", 5th Edition, 1986.
QUOTE]

Where might one get this manual? I did a couple of searches and could not find anyone who sells it.

TheSkunkWorks

If you can't find one, you can always download a PDF of the Chevy Power book C3 Corvette Chassis section here...

http://www.corvettefaq.com/c3/ChevyPower.pdf

...lots of good stuff at CorvetteFAQ.


Jim, I've about decided to do a mid-plate myself.