Friday 20 December 2013

6. Frame reinforcement




As the frame is nearly stripped - only the rear axle is still mounted - you see, that there is a need to add some tubes to stiffen the whole frame.
Mainly the rear part, where the trailing arms are mounted is a big rectangle. A little bit pushing from the left or the right and you have a parallelogram. And I bet, that even a Rover V8 can push a litle bit ;-)
The rear of the frame is a open rectangle - not really stiff...

If you know the blog of Martyn ( http://www.marcosmantula.com/ ), you can see the differences of a Marcos Mantula frame for street usage and for track usage.

Left side ist Martyns car build for track use, right side is mine, build for street use.

Mounting points of the front suspension: Wider upper wishbones.
The middle tunnel is strengthed with sheet metal
 
The rear has got the most upgrades - see them in red...

Based on this pictures and thinking about, how the load will force the frame I sketched some attempts of how to reinforce my frame:

Front area:
- Add 6x triangle to the corners
- Add a sheet to the damper mount on each side
Tunnel:
- Add 3x rods vertical ( nearly ) 
- Add one rod in level
Question
- Do you think, the blue one is neccessary ?








The middle:
- Add 5x triangles per side
- Add a sheet to the damper mount

The middle rear:
- add the bold red rods to the corners
The triangles are described above.
For the thin red lines look to the next pic.

The rear:
Here is needed the most effort to reinforce the frame.
- Add 3x rods to the floor - but take care for the boot floor - Martyn explained it twice !
- Add 2x rods as diagonals vertical left and right
- Add 2x triangles left and right
- Add 2x sheets to the most back
Question
You see two different pics for the blue rods of how to do the reinforcement.
What is the better one? Or do you have another proposal...



















Next step will be to remove the axle, but I failed to remove the break drum on the left side. The pads are bind the drum.
I have to use heavy tools...
Edit:
Its done, the axle is off...


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