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  #1  
Old 02-12-2020, 04:54 PM
Sam_B Sam_B is offline
 
Join Date: Apr 2016
Location: Boyceville, Wi
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Default Firewall pass-thru

For getting cables and wire through the firewall, I like the idea of the doubletree ball pass throughs, but they’re a bit spendy. Seeing as how I own a lathe, and a milling machine, I was thinking of making something similar, since I have the stock around, and just have to take the time to cut it. I was thinking of making a tapered collet, a tapered hole for said collet to nest into, and a cap to squeeze the collet into the hole and tighten it to whatever wire/cable/plumbing needs to pass through the firewall. Slather it in the 3M fireproof adhesive before it all goes together to fill in the cracks. So my idea may be well intentioned, but not work in the real world, so I was looking for opinions here.
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  #2  
Old 02-12-2020, 05:56 PM
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rocketbob rocketbob is offline
 
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I turned a stainless flange on my lathe, riveted that on the left side of the firewall and passed all three cables thru one hole. Fill the flange with firebarrier. Simple and cheap.
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  #3  
Old 02-12-2020, 07:23 PM
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Larry DeCamp Larry DeCamp is online now
 
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Default Yes machine or fab a bushing.

+1 for Rocket Bob suggestion. Dan H helped me years ago and the little T bushings riveted and sealed with firebarrier are flawless.
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  #4  
Old 02-12-2020, 08:58 PM
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Carl Froehlich Carl Froehlich is offline
 
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Get the nice SS passthrough flange that comes in the RV-14 kit. Put a piece of fire sleeve inside the flange and a piece over the top of the flange on the firewall side. Wire runs in the middle of course.

Carl
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  #5  
Old 02-12-2020, 09:20 PM
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fl-mike fl-mike is offline
 
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I’m using these with the Rocketbob fill.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

They are welded stainless.
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  #6  
Old 02-13-2020, 05:49 AM
Northernliving Northernliving is offline
 
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Location: Boston, MA
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Quote:
Originally Posted by fl-mike View Post
I’m using these with the Rocketbob fill.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

They are welded stainless.
Is this the firebarrier you are using for fill?
https://www.aircraftspruce.com/catal...l2000caulk.php
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  #7  
Old 02-13-2020, 07:40 AM
Brdog42 Brdog42 is offline
 
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Quote:
Originally Posted by fl-mike View Post
I’m using these with the Rocketbob fill.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

They are welded stainless.
Those who used this method for electrical wiring...

Did you use the same method for control cables? Throttle, mixture, etc.

Thanks for sharing something simple that works!
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  #8  
Old 02-12-2020, 09:40 PM
Sam_B Sam_B is offline
 
Join Date: Apr 2016
Location: Boyceville, Wi
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Default Little T bushings?

Quote:
Originally Posted by Larry DeCamp View Post
+1 for Rocket Bob suggestion. Dan H helped me years ago and the little T bushings riveted and sealed with firebarrier are flawless.
By ‘little T bushings’ do you mean the ones that come with the Vans kit?
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