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Old 08-20-2017, 12:22 PM
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Default Grand Sport Chassis Dimensions?

Anyone seen these? I've just started searching. Might be in my GS book.

No photobucket, but good photo here.

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Old 08-20-2017, 12:46 PM
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This one with C4 suspension was on CL a couple of years ago. He wanted 4k$. Pretty darn simple, got me thinking...


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Old 08-21-2017, 02:21 AM
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I've been curious about the weight of those GS frames (they look lighter than the stock frame), but I also get the impression that the torsional rigidity of those frames is less than the stock frame.
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Old 08-21-2017, 11:59 AM
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The GS book has some good photos and some tube OD dimensions. They also show the frame being stress tested. They were concerned about torsion according to the authors. 2500 lb-ft per degree was attained. Apparently without the roll bar.

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Luckily, google books has this section available, link above.

Add a full cage and it would be pretty stiff.

I'm seeing a bump on the drivers floor, I didn't think they channeled the body. Maybe it is for the exhaust.
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Old 08-21-2017, 09:44 PM
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Still digging for info.

69427, this weight is from Mongoose:

Bare Tubular Grand Sport Coupe/Roadster Frame

$6,995.00
Bare Tubular Grand Sport Coupe/Roadster Frame .120 wall 4″ round that excepts 88-96 Corvette suspension.

Additional Information
Weight 200 lbs

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Old 08-22-2017, 10:55 AM
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2500 lbs/degree is not that great (by modern standards) and might be optimistic depending on the conditions it was measured. Seems like some well placed gussets might help with torsional strength.

200lbs for a bare frame is not bad as long as you don't have to add more weight strengthening. Bare C3 frame is 285lbs
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Old 08-22-2017, 01:58 PM
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Quote:
Originally Posted by BBShark View Post
2500 lbs/degree is not that great (by modern standards) and might be optimistic depending on the conditions it was measured. Seems like some well placed gussets might help with torsional strength.

200lbs for a bare frame is not bad as long as you don't have to add more weight strengthening. Bare C3 frame is 285lbs
The photos show no roll bar on the test stand. I'm thinking it would go way up.

The Mongoose uses some smaller tubing, so it may be less.

My interest, it is so simple and c4's are being given away. Could probably be built with some pie cuts.
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Old 08-23-2017, 02:57 AM
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Quote:
Originally Posted by rtj View Post
This one with C4 suspension was on CL a couple of years ago. He wanted 4k$. Pretty darn simple, got me thinking...


How does the body mount/fasten onto that frame?
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Old 08-23-2017, 11:15 AM
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Last edited by rtj; 08-23-2017 at 11:17 AM..
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Old 08-23-2017, 11:24 AM
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I went through the photos and looks like some one removed them on the craigs list bargain. The ones above were Mongoose, I think.

Would not be to hard too scale it off, I'm looking for the easy way first.

There are 4 or 5 detailed GS assembly vids in the "misc vintage racing thread."
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