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Firewall penetrations

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rvdave

Joined: 24 Jan 2009
Posts: 191

Posted: Tue Oct 21, 2014 1:33 pm Post subject: Firewall penetrations

I'm at a standstill trying to decide how to get bundles of wires through the firewall.  I purchased the swivel grommets from Vans and after reading reviews of galling, bending, and almost ready to bore large holes--am not committing to that process.  First of all how do I get a large hole over 1" through the stainless?  There must be a tool I haven't seen yet.  I have ruined many bits drilling through the stainless in the past until I realized slow speed and lube is your friend.  Second I know there are better options out there I believe, just not sure which I'll use yet.  The cut off stainless door handles are pretty witty.  The rectangular from Avery may work well also.  Some have welded their own tubes--i dont quite have that talent.  Anyone to share photos and experiences?  Also tips to make hole in stainless firewall?  Thanks

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_________________
Dave Ford
Cadillac, MI

jmjones2000(at)mindspring
Guest

Posted: Tue Oct 21, 2014 2:35 pm Post subject: Firewall penetrations

Option #1

You can go to the aviation isle of your local big box hardware store and purchase a stainless bathroom grab bar (handicapped accessory). You cut the ends off and leave about 4inches of straight tube on each end. For $20 you will get 2 elbows with a flange that would cost you hundreds from aircraft spruce.  I will post a link to pics for this option later. 



Option #2 

(Taken from VAF forum page http://www.vansairforce.com/community/archive/index.php?t-57730.html )



Here is what I did. I bought a steel contuit junction penetration at Home depot and fit it to the firewall. They sell them in 1/4" diameter increments. I added a 2nd nut to act as a jam-nut. On the engine side I added about 5" of firesleeve with a steel band to keep it tight. I also added the set screw back inside the conduit part to prevent the steel band from slipping off. I have to give credit to my EAA tech rep Deene for the idea. I'm able to fit all three control cables plus my EI coaxials though this point. I'm not flying yet, but it looks to be a good solution thus far.

-Brad

https://lh3.googleusercontent.com/_n09BC0F4KSY/TZqG5mEWEZI/AAAAAAAAABE/G0SpRaIat2c/IMG_2433.JPG



https://lh5.googleusercontent.com/_n09BC0F4KSY/TZqG6dvV64I/AAAAAAAAABI/zLfDlnavK8M/IMG_2432.JPG



 Hope this helps!!



Justin



 	  Quote: 	
		   On Oct 21, 2014, at 15:33, rvdave <rv610dave(at)gmail.com> wrote:

 

 

 

 I'm at a standstill trying to decide how to get bundles of wires through the firewall.  I purchased the swivel grommets from Vans and after reading reviews of galling, bending, and almost ready to bore large holes--am not committing to that process.  First of all how do I get a large hole over 1" through the stainless?  There must be a tool I haven't seen yet.  I have ruined many bits drilling through the stainless in the past until I realized slow speed and lube is your friend.  Second I know there are better options out there I believe, just not sure which I'll use yet.  The cut off stainless door handles are pretty witty.  The rectangular from Avery may work well also.  Some have welded their own tubes--i dont quite have that talent.  Anyone to share photos and experiences?  Also tips to make hole in stainless firewall?  Thanks

 

 --------

 Dave Ford

 RV6 flying

 RV10 building

 Cadillac, MI

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=432137#432137

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bwestfall

Joined: 22 Oct 2008
Posts: 131
Location: Portland, OR

Posted: Tue Oct 21, 2014 2:44 pm Post subject: Firewall penetrations

A "Knockout Punch Kit" works pretty well.  Harbor Freight has a cheap set

that is adequate.  Decent brands are several hundred dollars so the HF ones

are the way to go since you probably won't ever use it again.

http://www.harborfreight.com/knockout-punch-kit-91201.html



I think most purchase a firewall pass thru kit from spruce or various online

sites



http://www.safeair1.com/averytools/firewallpassthrough.php

http://www.aircraftspruce.com/catalog/elpages/firewall_penetration_kit1in.ph

p?clickkey=10735



You will want 2 of them and I think most get the larger 1" size assuming the

plethora of engine monitor wiring...



-Ben





--

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flying-nut(at)cfl.rr.com
Guest

Posted: Tue Oct 21, 2014 3:00 pm Post subject: Firewall penetrations

I feel your pain .... from the many cuts by the SS.

Right or wrong, here's what I did.

I drilled a 3/16" hole and enlarged with a step drill and various dremel 

bits to accept a plastic grommet.  I have a MGL RDAC on the firewall to 

take all the various engine sensor wires so I really don't have a whole 

lot of wires going through the firewall. Haven't finished under the cowl 

yet but I'll put a liberal fillet of fireproof sealer around the bundle.

Linn



On 10/21/2014 5:33 PM, rvdave wrote:

 	  Quote: 	
		   



 I'm at a standstill trying to decide how to get bundles of wires through the firewall.  I purchased the swivel grommets from Vans and after reading reviews of galling, bending, and almost ready to bore large holes--am not committing to that process.  First of all how do I get a large hole over 1" through the stainless?  There must be a tool I haven't seen yet.  I have ruined many bits drilling through the stainless in the past until I realized slow speed and lube is your friend.  Second I know there are better options out there I believe, just not sure which I'll use yet.  The cut off stainless door handles are pretty witty.  The rectangular from Avery may work well also.  Some have welded their own tubes--i dont quite have that talent.  Anyone to share photos and experiences?  Also tips to make hole in stainless firewall?  Thanks



 --------

 Dave Ford

 RV6 flying

 RV10 building

 Cadillac, MI

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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larkrv10(at)gmail.com
Guest

Posted: Tue Oct 21, 2014 5:33 pm Post subject: Firewall penetrations

Dave, I went the home made route.  I bought a piece of 1" dia, SS rod, drilled/bored it our to 3/4" ID (I have a metal lathe) and then had a welder attach a 1/16" mounting plate/flange.  I made 2 large pass throughs for the wiring and 4 smaller others for the control cables for just under $100.  Besides being a bargain compared to other options you can purchase, they are good solid and fire proof compared to Van's suggested pass through.  

Just another data point  [img]cid:330(at)goomoji.gmail[/img]

Rick

#40956

Southampton, Ont

On Tue, Oct 21, 2014 at 5:33 PM, rvdave <rv610dave(at)gmail.com (rv610dave(at)gmail.com)> wrote:

 	  Quote: 	
		  --> RV10-List message posted by: "rvdave" <rv610dave(at)gmail.com (rv610dave(at)gmail.com)>

 

 I'm at a standstill trying to decide how to get bundles of wires through the firewall.  I purchased the swivel grommets from Vans and after reading reviews of galling, bending, and almost ready to bore large holes--am not committing to that process.  First of all how do I get a large hole over 1" through the stainless?  There must be a tool I haven't seen yet.  I have ruined many bits drilling through the stainless in the past until I realized slow speed and lube is your friend.  Second I know there are better options out there I believe, just not sure which I'll use yet.  The cut off stainless door handles are pretty witty.  The rectangular from Avery may work well also.  Some have welded their own tubes--i dont quite have that talent.  Anyone to share photos and experiences?  Also tips to make hole in stainless firewall?  Thanks

 

 --------

 Dave Ford

 RV6 flying

 RV10 building

 Cadillac, MI

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=432137#432137

 

 

 

 

 

 

 

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