QUOTE(FourBlades @ May 2 2011, 12:51 PM)
When a roll cage bar/chassis tube goes through a firewall, what do you do?
Do you cut the hole close and then weld around it, use seam sealer, just live with a small gap?
I am trying to decide what to do with bars connecting the cage to the front and rear suspension points.
Thanks,
John
Hi John,
Given that the 914 moncoque is a "Flexy Flier" on a good day, when it came to sealing the holes through the firewalls, I took a different approach:
1) Chassis stiffness comes from a complete rollcage that reaches fore & aft to brace the load point at the top of the suspension at each corner.
2) Rather than trying to weld to the Flexy Flier, which I'm betting would creak, groan and make continually annoying noises. I got some THICK wetsuit foam sheeting, wrapped around the tubes, glued it all together creating a membrane barrier and pop-riveted the outer edges to the PURE 914 sheet metal.
3) The dirt & dust stays out and once I get on track with the V8 roaring, I don't hear ANY unusual chassis noises at ALL! Obviously, this is a brilliant plan!!
Terry