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-   -   Firewall Passthrough (https://vansairforce.net/community/showthread.php?t=140476)

Lynnb 08-03-2016 01:16 PM

Quote:

Originally Posted by clutch22 (Post 1100147)
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. :confused:

fyi: If you look at the Van's wiring harness plans, they actually drill a different hole next to the skin to run the battery cable through.

Dan Langhout 08-03-2016 02:19 PM

4 on a 7
 
This is on an RV-7 - but for what its worth I used 4 for electrical. Top "corners" carry EGT/CHT and other engine sensor wires; one near the center top carries Electronic Ignition leads/ mag P-lead; large angled one on the right side carries all power wires.

I also used 3 additional passthroughs like these for the throttle, mixture and prop cables.




ccrawford 08-03-2016 02:24 PM

Quote:

Originally Posted by flion (Post 1100053)
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.

I like the idea if CPCs but can you use them with the thermocouple wire for EGT and CHT?

jwilbur 08-03-2016 02:32 PM

I'm using the SS fire-sleeve pass throughs from ACS you've mentioned. I ended up with one of each size. The interior firesleeve eats up a lot of space. The #2 battery I bring through the existing hole which I enlarged for a bulkhead fitting. The smallest SS pass-through I've got on the top-left of the firewall and will be using for ignition related wires. The 3/4" pass-through I've got in the little slot designed for the heat boxes and alternate air door. The 1" pass-through I've got on the upper right for all the thermo-couple wires and various other engine monitor wires. Van's has you drill another hole for a bulkhead fitting if you position the manifold pressure sensor on the inside. The existing hole on the far right I probably could have used for the 1" SS pass-through but didn't, thinking I would use it for something else. I'm going to plug that one.

Also, if you happened to drill the holes in the stainless recess according to the plans (as I did), you'll find that most of the nice pass-throughs for prop/mixture/throttle cables won't fit because the holes are too close together. I found these on ACS which do fit. I installed them just the other day.

https://www.aircraftspruce.com/catal...algrommets.php

Lynnb 08-03-2016 02:53 PM

I like those SPHERICAL FIREWALL FITTINGs, what size did you order for the three control cables?

Quote:

Originally Posted by jwilbur (Post 1100181)
I'm using the SS fire-sleeve pass throughs from ACS you've mentioned. I ended up with one of each size. The interior firesleeve eats up a lot of space. The #2 battery I bring through the existing hole which I enlarged for a bulkhead fitting. The smallest SS pass-through I've got on the top-left of the firewall and will be using for ignition related wires. The 3/4" pass-through I've got in the little slot designed for the heat boxes and alternate air door. The 1" pass-through I've got on the upper left for all the thermo-couple wires and various other engine monitor wires. Van's has you drill another hole for a bulkhead fitting if you position the manifold pressure sensor on the inside. The existing hole on the far right I probably could have used for the 1" SS pass-through but didn't, thinking I would use it for something else. I'm going to plug that one.

Also, if you happened to drill the holes in the stainless recess according to the plans (as I did), you'll find that most of the nice pass-throughs for prop/mixture/throttle cables won't fit because the holes are too close together. I found these on ACS which do fit. I installed them just the other day.

https://www.aircraftspruce.com/catal...algrommets.php


clutch22 08-03-2016 03:03 PM

Quote:

Originally Posted by Lynnb (Post 1100154)
fyi: If you look at the Van's wiring harness plans, they actually drill a different hole next to the skin to run the battery cable through.

I noticed that, but is there a reason not to use this hole for the cable if I plan to add one or two separate passthru's elsewhere for the other wires?

flion 08-04-2016 08:28 AM

Quote:

Originally Posted by ccrawford (Post 1100176)
I like the idea if CPCs but can you use them with the thermocouple wire for EGT and CHT?

Short answer: yes. Try to plan so that signal (sensor) wires do not share a connector with power wires.

sglynn 08-04-2016 09:37 AM

Quote:

Originally Posted by Dan Langhout (Post 1100174)
This is on an RV-7 - but for what its worth I used 4 for electrical. Top "corners" carry EGT/CHT and other engine sensor wires; one near the center top carries Electronic Ignition leads/ mag P-lead; large angled one on the right side carries all power wires.

I also used 3 additional passthroughs like these for the throttle, mixture and prop cables.




Your photos are not coming thru. Just shows a dash.

Dan Langhout 08-04-2016 05:35 PM

Should work now.
 
Quote:

Originally Posted by sglynn (Post 1100384)
Your photos are not coming thru. Just shows a dash.

Hopefully they will show now. Boy do I hate google photos:mad:

ccrawford 08-05-2016 10:10 AM

They were showing for me yesterday afternoon, but now they are just dashes again.


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