Quote:
Originally Posted by Overkill
Jim,
Looks like you've made some progress since I last saw the car on Metal Meet. Looks good.
Have a question for you. You went with a double frame, perimeter and one along the tranny. I've been thinking about doing the same thing. What size tubing did you use in the in the two different members?
John
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John
If you are talking about the perimeter being the box section of the door sills, that is stock MG and really isn't part of the frame structure anymore. The strength of the car is the backbone structure that forms the trans tunnel and also provides the mounts for the engine and both suspensions. Everything else is hung off of that structure. Lotus used a similar construction in the Elan and Herb Adams shows a Cobra chassis that he made using that same concept in his book
Chassis Engineering.
The tubing I used in the tunnel section is 1"x3" .083" along the bottom and 1" round and 1"x2" on the top (I wanted the rounded edgein front). It is sheeted inside and out with 18 ga and it has 1" polyethelene foam sandwiched in for insulation. It makes a very rigid structure.
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The tubes around the engine compartment are 2" .083" top and bottom
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The rear rails are 2"x3" .083". The relatively thin tubes would probably not be strong enough in a conventional ladder frame configuration but they gain a lot of rigidity with angled tubing braces and 18 ga shear panels.
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