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Old 11-25-2018, 01:34 PM
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Default Fiberglass For Firewall

I had to cut a corner of the footwell out of my car for header clearance. I'm thinking that I will have 1/2 inch clearance between the glassed in cutout of the footwell and the header.

Is conventional glass fiber with epoxy heat resistant (enough for this)?
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Old 11-25-2018, 07:56 PM
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Just did a quick check of some of my tables - and the max I see for "run-of-the-mill" Epoxy is around 200 degrees F.

McMaster sells some sheet (already laid-up) that is Flame retardant and good to 140F.

Specialist resins go up in heat range - and so does cost.

From FiberGlast:
Quote:
#3300/3330 High Temp Tooling Epoxy can be used with #1096 High Temp Epoxy Surface Coat. When used together, High Temp Epoxy Resin and High Temp Epoxy Surface Coat can create tough, durable, heat resistant tools.

Mix Ratio (by weight) – 100:22
Pot Life @ 77F – 150-180 minutes
Color – Amber
Maximum Service Temperature – 350F

$150 a quart...
There is a detailed post cure needed and may not be too practical.

A piece of sheet metal with a Jet-Hot Coating?

Sounds like an interesting challenge. Not much help there - Good Luck!

Cheers - Jim
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Last edited by phantomjock; 11-25-2018 at 08:00 PM..
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Old 11-25-2018, 09:31 PM
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I have successfully used DEI Floor and Tunnel shield. It has a metal outside, a heat resistant material on the inside, and is sticky backed. It is less than .25 inch thick and molds fairly well.

Pappy
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Old 11-25-2018, 09:56 PM
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I could do something like vette427sbc did. That material looks like foil.

I stole his pic
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Old 11-25-2018, 10:04 PM
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DEI Reflect-a-gold
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The 24x24 sheet is $44.xx on summitracing
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Old 11-25-2018, 11:13 PM
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Quote:
Originally Posted by vette427sbc View Post
DEI Reflect-a-gold
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The 24x24 sheet is $44.xx on summitracing
I've used it - works fine for reflective heat but does not work well for high radiant heat - like exhaust. I put it on a shield for my fuse box in the Viper and it only dropped the temp on the inside of the shield by 10 degrees. I added the tunnel shield and the temps dropped 40 degrees at the fuse box wall.

Pappy
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Old 11-26-2018, 02:51 AM
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Here are photos of the heat shield I referred to above. I covered the whole thing with the gold reflective, then I added the DEI Tunnel Shield to the bottom half (closest to the exhaust). The Vipers have a lot of trouble melting the plastic fuse box, especially when driven hard on track. I have had no issues since adding the shielding. The bottom part of the shield is .75 inch from the exhaust manifold.

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Old 12-02-2018, 11:25 AM
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I will give the DEI Tunnel Shield a go. Here is a picture of the footwell cutout I need to clearance.

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Old 12-05-2018, 12:10 PM
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I called West Systems about the resistance of fiberglass to heat from the headers and was told that 1/2" clearance would be OK. The tech guy I talked to has a 71 Corvette. He did tell me that I should use epoxy resin (to bond to the polyester floorpan) and woven fiberglass mat. I will also use the DEI tunnel insulation.

After checking the underbody clearance with the completed chassis, turns out I will have to cut out the top of the tunnel to clear the taller Tremec transmission anyway. So that is another area that I will have to insulate. Planning on an aluminum cover there.

Might be easier to cut out the whole tunnel!
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