Sealed Rear Firewall?

[zebra]

Gday guys.

As some of you may know im building my 33 into a track biatch and going to log book it as a 2a Closed sports car.

So I need pics/ideas on how to seal up the rear firewall as per the cams regs

7.4 Firewall: An adequate firewall must separate the fuel tank from the driver’s compartment. It must be impervious to the passage of fumes or liquids.

I dont really want to cut shit out of the car as i one day may see road use again (i doubt it).

Im going to get a sheet of aluminium and cut it up and sikaflex it to as many of the holes I can...but there are a few tricky angles/nooks and crannies that I wont be able to do like that.

So help me please....and photos would be awesome

Thanks

Andrew

[Duncan]

well...will your fuel system be in the boot or under the floor? If its the latter you have no issue because the floor is the firewall.

If you are putting it in the boot the best option is to remove the whole parcel shelf and replace with flat ally sheet....but since you mention returning to road use the best thing would be to put the fuel system in a perpex or ally box inside the boot.

BTW I saw a brilliant surge tank setup at hills motorsport the other day (and cheap). A simple ally surge tank with the lift and main pumps inside. simple to install and easy to seal from tha cabin.

In the nugget we mounted the fuel system in the driver's quarter panel and sealed in off from the boot - the area where the attessa resoviour sits in a standard gtr

[zebra]

now thats an idea.

I was assuming that because the access to the fuel tank in a 33 is under a cover in the boot that i would still need to seal the rear up.

I might ring mark and ask about that setup, or ill sort somthing out under the car

[Duncan]

nope, no scruitineer should have an issue with the standard setup - it is totally sealed from the boot by a metal cover.

[zebra]

well that makes that fairly easy then

the alternative that keeps playing on my mind is to cut out the spare wheel well and hang a 70L fuel cell underneath with 2 pumps running off that., but that is a fair bit of work, that reminds me dunc, do you have those pics of how you did it in the nugget?

[BOZ22N]

How well does the firewall need to seal? if you have holes for harnesses to run through will that be ok or do you need fit a sealed, through plug?

[sav man]

I don't think cams are real fussy, when dad ran the invertationals, they made him cover the parsel shelf with cardboard (yer cause that shit an't flamimble). As far as i was told, it doesn't have to be 'sealed' just more if somthing goes bang it doesn';t have a direct path to hit you.

[BOZ22N]

Do you reckon the std cover behind the back seat in a R33 will do? and then just a cover on the top?

[datofj]

Im going to get a sheet of aluminium and cut it up and sikaflex it to as many of the holes I can...but there are a few tricky angles/nooks and crannies that I wont be able to do like that.

That should be enough.