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  #1  
Old 08-02-2016, 07:48 PM
ethand ethand is offline
 
Join Date: Mar 2013
Location: San Diego
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Default Firewall Passthrough

Where did you put your firewall pass through for wires, sensors wires etc and how big?

I plan on going with the SS kits from Spruce. After a search on line I found a few examples but looking to see where others put them and what size.

Thanks in advance

E
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  #2  
Old 08-03-2016, 07:22 AM
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Lynnb Lynnb is offline
 
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Default Timely Question

You're question is very timely, I was about to ask the same thing. I did buy two of the 1" SS pass threws, I was wondering if you just enlarge the two holes in the image below to be 1" or are these earmarked for something else, I looked through the plans and can't really see that these are for anything else:

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Last edited by Lynnb : 08-03-2016 at 09:16 AM. Reason: Images not showing
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Old 08-03-2016, 08:35 AM
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flion flion is offline
 
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I can't see your image but if that is the roughly thumb-sized holes left and right on the firewall, that is indeed what they are intended for. However, I am using sealed CPCs for my passthrough and the extended sleeve (about 3 inches) would have interfered with the motor mount, so I covered the existing holes with riveted stainless steel covers and relocated my openings. My point is that you can relocate things as needed and appropriate for your installations.
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  #4  
Old 08-03-2016, 08:46 AM
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Thanks, can other's not see my image? I have been having a hard time moving from picassa to goggle photos.
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  #5  
Old 08-03-2016, 08:48 AM
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cderk cderk is offline
 
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cant see it either...
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  #6  
Old 08-03-2016, 08:55 AM
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rotoiti rotoiti is offline
 
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Make sure you share the photo first and then change your link.
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  #7  
Old 08-03-2016, 09:17 AM
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Lynnb Lynnb is offline
 
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Ok, how about now:
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  #8  
Old 08-03-2016, 09:38 AM
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rotoiti rotoiti is offline
 
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Yup, I can see both now
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  #9  
Old 08-03-2016, 12:44 PM
clutch22 clutch22 is offline
 
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Not many people have chimed in. I'm also interested in what people have done. I've been stalling drilling mine, but I'm about finished with the avionics and will be riveting my panel substructure in soon and would rather install the passthrough prior.

I'm thinking I will use the existing LH hole for my battery cable, install a 1" firesleeve passthrough near the center, and use the RH passthrough hole only if I were to run out of room in the 1" hole.
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  #10  
Old 08-03-2016, 12:56 PM
BobTurner BobTurner is offline
 
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Remember that the alternator wire carries a pretty large current and does have some ac ripple on it. In principle good avionics boxes will filter out any pickup, but I chose to use separate firewall holes for the alternator output, and for low level signals (EGT probes, etc). ymmv
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