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firewall thickness/material?

aj_johnson
A.J. Johnson
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aj_johnson

firewall thickness/material?
April 22, 2014 12:33PM

Registered: 01/07/2011
Posts: 1,381

Zipped through the ruels regarding using an OEM fuel tank located in the trunk. Says it must be firewalled but gives no requirements on material or thickness. Any recommendations?

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john vanlandingham
John Vanlandingham
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john vanlandingham

Re: firewall thickness/material?
April 22, 2014 12:40PM

Registered: 12/20/2005
Posts: 14,152

Quote
aj_johnson
Zipped through the ruels regarding using an OEM fuel tank located in the trunk. Says it must be firewalled but gives no requirements on material or thickness. Any recommendations?

.032" with pop riveted reinforcements

John Vanlandingham
Sleezattle, WA, USA

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aj_johnson
A.J. Johnson
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Location: Pendleton OR
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88 Audi 80

aj_johnson

Re: firewall thickness/material?
May 13, 2014 01:26AM

Registered: 01/07/2011
Posts: 1,381

How big/small a gap is reasonable?

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hoche
Michel Hoche-Mong
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hoche

Re: firewall thickness/material?
May 13, 2014 02:03AM

Registered: 02/28/2006
Posts: 1,156

The idea is to a) prevent flammable fumes from getting into the cockpit area and b) create enough of a barrier so that should something light back there, it doesn't blow forward and set you on fire before you can stop and exit. So yeah, aluminum sheet is fine, but try to seal up all the gaps.

Self-righteous douche canoe

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alkun
Albert Kun
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alkun

Re: firewall thickness/material?
May 13, 2014 02:38AM

Registered: 01/07/2008
Posts: 1,732

Fire caulk! (for chimney, not from STD)

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heymagic
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heymagic

Re: firewall thickness/material?
May 13, 2014 10:17AM

Registered: 01/25/2006
Posts: 3,740

No visible gaps. Use caulk, a couple layers of aluminum sealing tape, rivet or weld small pieces, . Don't forget to seal the area in the C-pillar also. Spray foam and aluminum tape work pretty well there.

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aj_johnson
A.J. Johnson
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Location: Pendleton OR
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88 Audi 80

aj_johnson

Re: firewall thickness/material?
May 13, 2014 11:17AM

Registered: 01/07/2011
Posts: 1,381

Thanks Al! saved me a trip to vegas.

In other news this little project just got more difficult...

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Doivi Clarkinen
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Doivi Clarkinen

Re: firewall thickness/material?
May 13, 2014 05:55PM

Registered: 02/12/2006
Posts: 1,432

Quote
heymagic
Spray foam and aluminum tape work pretty well there.

Only if it's some kind of fireproof spray foam. Please note that most common expanding foam you get from the hardware store is EXTREMELY flammable and makes LOTS of nasty toxic smoke.

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aj_johnson
A.J. Johnson
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Location: Pendleton OR
Join Date: 01/07/2011
Age: Settling Down
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Rally Car:
88 Audi 80

aj_johnson

Re: firewall thickness/material?
May 13, 2014 06:09PM

Registered: 01/07/2011
Posts: 1,381

Quote
Doivi Clarkinen

Quote
heymagic
Spray foam and aluminum tape work pretty well there.

Only if it's some kind of fireproof spray foam. Please note that most common expanding foam you get from the hardware store is EXTREMELY flammable and makes LOTS of nasty toxic smoke.

I assumed Gene is referring to a specific product?

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heymagic
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heymagic

Re: firewall thickness/material?
May 13, 2014 06:20PM

Registered: 01/25/2006
Posts: 3,740

http://www.homedepot.com/p/GREAT-STUFF-Fireblock-Insulating-Foam-Sealant-16-oz-345372/202023037

Cheap to boot. Many people tend to want to forget that passage in the C-pillar which can be quite large when you actually examine it.