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  #1  
Old 12-15-2017, 08:20 AM
Stockmanreef Stockmanreef is offline
 
Join Date: Nov 2012
Location: Midland, mi
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Default Firewall insulation

I have been reading a bit on insulation of the firewall. Has anyone done this for their 14 and if so, can you post how you did it, when you did it and pictures.

Thanks
Ken
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Ken Stockman
Midland, MI
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RV-14 (serial number 140073)
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  #2  
Old 12-15-2017, 03:04 PM
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Av8rRob Av8rRob is offline
 
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I did this on my -14. First i ordered stainless steel (.003 x 24” x 48”) this was $33 plus shipping on ebay. Then i got fiberfrax from ACS of 1/8” thick. I cut the fiberfrax around all know holes and about 1/4” away from where the engine mount touches the firewall. The stainless at 24” is not tall enough to cover entire firewall but because my plane is a tailwheel, the engine mount has a large cross member along the bottom. With that issue and the cabin heat registers both not getting coverage, only a small horizontal strip is unprotected with the secondary layer. I installed these when i was ready to install my engine mount. Between the enginge mount/ two firewall pass thrus / and brake reservoir the sandwich of fiberfrax and stainless stays put pretty well. I did use a few stainless pop rivets to the sides of the tunnel and might do a few more on the top part depending on necessity. I then used 3m 2000 firebarrier as a caulking to seal up all edges and holes. So far ive been very happy with this slight deviation from plans as i feel is does cost or weight much and adds a margin of safety and comfort.



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Rv-14 emp/fuse done working on wings and finish
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  #3  
Old 12-15-2017, 04:11 PM
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DanH DanH is offline
 
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Rob, did you run a bead of Firebarrier 2000 in the firewall flange corner before applying the fiberfrax and stainless foil?



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  #4  
Old 12-15-2017, 04:44 PM
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Bill Boyd Bill Boyd is offline
 
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Location: Landing field "12VA"
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Default Timely reminder, Dan

... working on this step tonight.

Thanks for all the firewall insulation ideas and testing!
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Hop-Along Aerodrome (12VA)
RV-6A - N30YD - flying since '98
RV-10 - N130YD reserved - under construction

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  #5  
Old 12-15-2017, 05:30 PM
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Av8rRob Av8rRob is offline
 
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Yes Dan, I forgot to mention that step
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Rv-14 emp/fuse done working on wings and finish
Paid dec 2017
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  #6  
Old 12-15-2017, 08:44 PM
JHartline JHartline is online now
 
Join Date: Dec 2012
Location: Carrollton, GA 5GA2
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Default Now I’m curious

[quote=DanH;1225878]Rob, did you run a bead of Firebarrier 2000 in the firewall flange corner before applying the fiberfrax and stainless foil?

Ok...I’ll bite...why add the fillet?

I did my firewall using your diagram but I never thought to ask the reason for the first fillet.
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RV-14 - Finish and FWF in progress
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  #7  
Old 12-15-2017, 09:36 PM
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Bill Boyd Bill Boyd is offline
 
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Default and I'm embarrassed

... realized as I was about to lay the first fillet that I can't insulate the firewall until I rivet the forward top structure on - and that's not happening until I'm done installing the avionics goodies in the panel and sub-panel. About a year from now. Oops!
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Hop-Along Aerodrome (12VA)
RV-6A - N30YD - flying since '98
RV-10 - N130YD reserved - under construction

donating monthly to the VAF - thanks, Doug
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  #8  
Old 12-16-2017, 12:17 AM
Av8rRob's Avatar
Av8rRob Av8rRob is offline
 
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Default

Quote:
Originally Posted by Bill Boyd View Post
... realized as I was about to lay the first fillet that I can't insulate the firewall until I rivet the forward top structure on - and that's not happening until I'm done installing the avionics goodies in the panel and sub-panel. About a year from now. Oops!

I have same issue. If you look closely, you will see the edges above the engine mount are still lose. I only attachech the bottom portion at this point. Its on the to do list.
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Rv-14 emp/fuse done working on wings and finish
Paid dec 2017
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  #9  
Old 12-16-2017, 05:19 AM
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DanH DanH is offline
 
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[quote=JHartline;1225930]
Quote:
Originally Posted by DanH View Post
Rob, did you run a bead of Firebarrier 2000 in the firewall flange corner before applying the fiberfrax and stainless foil?
Ok...I’ll bite...why add the fillet?
I did my firewall using your diagram but I never thought to ask the reason for the first fillet.
Need a bead over the punched holes and slots in the flange corner to ensure the fiberfrax binder (the glue that holds the felt together) doesn't outgas into the cockpit when heated. The desired path for the outgas is forward, through the overlap seam, which is why it is in the center, and covered with easily melted aluminum tape.
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  #10  
Old 01-03-2018, 12:24 PM
Aluminum Aluminum is offline
 
Join Date: Jul 2017
Location: San Jose, CA
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Default

Thank you all for sharing, great advice.

Quote:
Originally Posted by Av8rRob View Post
Then i got fiberfrax from ACS of 1/8” thick.
I found out that McMaster stocks a much wider selection of fiberfrax material:

https://www.mcmaster.com/#93285K18

Search under "insulation" then "Ultra-High-Temperature Ceramic Fiber Insulation Sheets and Strips".
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