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  #11  
Old 08-03-2016, 01:16 PM
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Lynnb Lynnb is offline
 
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Location: Cedar Hill, TX
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Quote:
Originally Posted by clutch22 View Post
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.
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.
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  #12  
Old 08-03-2016, 02:19 PM
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Dan Langhout Dan Langhout is offline
 
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Location: Huntsville, AL USA
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Default 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.



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Last edited by Dan Langhout : 08-04-2016 at 05:32 PM.
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  #13  
Old 08-03-2016, 02:24 PM
ccrawford ccrawford is offline
 
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Quote:
Originally Posted by flion View Post
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?
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  #14  
Old 08-03-2016, 02:32 PM
jwilbur jwilbur is offline
 
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Location: Culpeper, VA
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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
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Last edited by jwilbur : 08-08-2016 at 04:15 PM.
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  #15  
Old 08-03-2016, 02:53 PM
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I like those SPHERICAL FIREWALL FITTINGs, what size did you order for the three control cables?

Quote:
Originally Posted by jwilbur View Post
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
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  #16  
Old 08-03-2016, 03:03 PM
clutch22 clutch22 is offline
 
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Quote:
Originally Posted by Lynnb View Post
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?
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  #17  
Old 08-04-2016, 08:28 AM
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flion flion is offline
 
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Quote:
Originally Posted by ccrawford View Post
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.
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  #18  
Old 08-04-2016, 09:37 AM
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sglynn sglynn is offline
 
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Quote:
Originally Posted by Dan Langhout View Post
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.
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  #19  
Old 08-04-2016, 05:35 PM
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Dan Langhout Dan Langhout is offline
 
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Location: Huntsville, AL USA
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Default Should work now.

Quote:
Originally Posted by sglynn View Post
Your photos are not coming thru. Just shows a dash.
Hopefully they will show now. Boy do I hate google photos
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  #20  
Old 08-05-2016, 10:10 AM
ccrawford ccrawford is offline
 
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Location: Denver, CO
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They were showing for me yesterday afternoon, but now they are just dashes again.
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