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  #1  
Old 04-03-2020, 12:40 PM
Reflex Reflex is offline
 
Join Date: Jan 2015
Location: Kansas
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Default Confusion/quetsions on Fiberfrax installation...

Thought I'd start a new thread instead of hijacking an old one....

After reading several threads/posts on adding a safety margin to the firewall, I've decided that this is one of the very few modifications I'd like to make on my RV-14. However, I'm still a bit confused. I'm planning on using Fiberfrax and Dan H's method on the firewall. Dan has been kind enough to give very detailed drawings of his method. However, I'm slow enough that I'm not quite understanding when or how to mount things to the firewall.

If we put the Fiberfrax and covering on first, it appears that items on the firewall would have a very "soft" mount. If we put items on the firewall before the Fiberfrax is installed, then we could/will have hot spots in the event of a fire. In a perfect world, I'd like to install install the Fiberfrax first and then mount everything to the firewall, I'm just afraid that they won't stay put. I've cheated and put Dan's pictures and a couple other examples below.

In what order do I install the items on the firewall, before or after Fiberfrax?

Drawings courtesy of a previous post from Dan H




Found this on Steevo's web site. It's an example of the type of items I'm wondering about.

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  #2  
Old 04-03-2020, 01:56 PM
Kyle Boatright Kyle Boatright is online now
 
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Location: Atlanta, GA
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You do not want fiberfrax or foil tape under anything that requires a structural attachment like the engine mount. So:

1) Temporarily mount things on the firewall over a paper or cardboard template, mark the template to identify areas where you don't want the barrier. Remove the items, and make a barrier to to fit. Come back and attach the items later.

2) Mount all of the stuff, then cut and fit a barrier of fiberfrax and stainless to go around all of the items.

3) Whatever alternate method you can come up with. Hopefully better than the two I suggested. ;-)
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Old 04-03-2020, 06:03 PM
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DanH DanH is offline
 
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Quote:
Originally Posted by Reflex View Post
In a perfect world, I'd like to install install the Fiberfrax first and then mount everything to the firewall, I'm just afraid that they won't stay put. ...In what order do I install the items on the firewall, before or after Fiberfrax?
What Kyle said, nothing under the motor mount attach points. As for the rest, none of it is critical. Lots of hours out there with accessories bolted down over foil and frax, but if it bothers you, do cutouts.
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Old 04-04-2020, 04:34 AM
Reflex Reflex is offline
 
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Many thanks, just what I wanted to hear.
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Old 04-04-2020, 06:47 AM
dwranda dwranda is offline
 
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Dan,
I am hopefully getting my fiber and stainless foil on this weekend. Where they go around the motor mounts did you just put a fillet of the fire barrier compound around the mount so it holds down the foil around them?
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Old 04-04-2020, 08:29 AM
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DanH DanH is offline
 
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Dan,
I am hopefully getting my fiber and stainless foil on this weekend. Where they go around the motor mounts did you just put a fillet of the fire barrier compound around the mount so it holds down the foil around them?
Yep. Fillet every foil edge, everywhere. Sealing is good, and at the practical level, you want the edges buried so they don't cut you.
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Old 04-04-2020, 11:37 AM
Stockmanreef Stockmanreef is offline
 
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I used razor knife to cut a slot out where parts were mounted. I poked a hole through the SS foil through the nut plates. I then opened up the holes and attached the part. I then traces around it with a sharpie, removed the item. I then cut a line down the center (about 2/3 the length) and then diagonal to the corners. opened up the hole and cut out the insulation. I then folded the sharp edge over to make sure the bolt holes were exposed and then bolted the part in place. At this point, the part holds the SS foil to the FW. Hopefully this is an acceptable method. Does this make sense?

I did get 1" SS tape and I have used that in places around things and I used it to join the two sheets of SS foil together down the middle.

I do have the insulation and SS behind the battery. this means that the battery "brace" can't screw in completely.

I was looking at your picture and I noticed that you have only 2 FW pass thru fittings (the one supplied by Van's). I know that you can put everything through those two points, I decided to put one in the upper section near just left of the center point (pilot side). I got it from ACS--they are very nice. I put all the wires through that pass thru, then I put only the push pull cable through the other two.

From what I understand, the cables are more likely to need being replaced. I figure that it would be much easier without the wires in the way.

Also, put on the forest of tabs on the FW before doing the insulation. Also figure out where to put the 60 amp fuse and shunt. I screwed that up, which led me to need to put in an oil air separator.

One last thing. That SS foil is supper sharp you should were cut resistant glove. I did not and ended up with several small stab wounds.
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  #8  
Old 04-04-2020, 12:01 PM
cajunwings cajunwings is offline
 
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Default FW insulation

If the foil has any curve to it use to your advantage and install it curving toward the FW. Most of my FW items will bolt thru the foil and clamp it in place, but a couple will be mounted using 1/4 long bushings as spacers

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  #9  
Old 04-06-2020, 06:48 AM
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mulde35d mulde35d is offline
 
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Default Firewall near done

This is a photo of a 14A firewall with 1/8" fiberfrax and .005 Stainless Steel Shim stock. You can see what we did cutouts around and what is simply bolted through. The foil tape has not yet been applied and the Firebarrier 2000+ has not yet been applied. This firewall has a few extra mods so don't feel like your missing a bunch of components, but hopefully this helps you visualize. We used Stainless Steel blind rivets to hold everything together.

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  #10  
Old 04-06-2020, 06:01 PM
dwranda dwranda is offline
 
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Thanks Dan! Also seeing firewalls completed like this last pic are a great help. Thank you! Does anyone have a pic of how they covered the recess area in a 7 or 9 firewall?
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