Sealing S13 Rear Firewall - Surge Tank Setup

[No Crust Racing]

It seems like a good idea to seal up the rear firewall if you have a surge tank setup, I'm not sure if this is an actual requirement on a track car, but I've bought some .6mm aluminium sheet already.

The question I have is how hardcore you need to go, if there's not some AASA rule on it.

Can you just cover over the main hole and the speaker holes or do you need to cover in the whole thing including the wholes where the wires run through etc.

I ask as it determines how much sheet I'll have left and if I get carried away and do door cards too.

[Duncan]

CAMS is crystal clear that the entire fuel system must be SEALED from the cabin. I run the surge tank under the car for that reason. I've also seen Perspex boxes in the boot to do the same.

Well, and to make sure I don't die a horrible fiery death. At least not due to a fuel leak in the cabin

[No Crust Racing]

This is just a club level car. Will never be racing door to door or under CAMS.

I'd the main reason behind the need to seal it fire or fumes?

As a few small holes aren't going to let big flames in so long as the main hole and speaker holes are sealed.

I can just seal the lot with one piece but it wouldn't be air tight anyway.

[Duncan]

The cams fuel rule applies to all speed events including super sprints and hillclimbs, from schedule A

11. save for 1st Category automobiles, be fitted with a bulkhead constructed from a flame- and liquid-proof

material. This bulkhead shall effectively seal the cockpit from the fuel tank or re-fuelling system. If the material is

clear it shall be a minimum of 6mm thick;

It's not like everyone follows this fully, but it is pretty clear.

I've never seen an AASA rulebook but the scrutineers generally want the same as cams rules.

[No Crust Racing]

I might just try and cover in the whole lot then as best I can, throw on some silicon as well. I've got some 200deg Engineering silicon there I think.

Edited September 2, 2014 by ActionDan

[Dale FZ1]

Sikaflex 227 is the stuff to use if you're looking to bond in some sheeting.

[No Crust Racing]

I might have some spare from the body kit install.

That said adhesive won't be enough in some spots. Parcel shelf especially.

It's too uneven.