Control Cable Firewall Bushing Size?

[flyingbeaver26]

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

[ronschreck]

Originally Posted by flyingbeaver26

Here is what I did. I bought a steel contuit junction penetration at Home depot and fit it to the firewall. -Brad

Brad,
Great minds think alike! I did the same thing to get all my electrical connections through the firewall. The hole is big enough to get the Lightspeed ignition cables through without having to disassemble the connectors.

[tonyjohnson]

Beaver and Ron,

Thanks for that great idea.

It turns out that I have a box of 50 of those connectors left over from the rennovation of my home. I did not even have to go to home depot.

[Ron RV8]

Can anyone tell me why the steel eyeball pass throughs have a max hole size of .26. Is there any reason they cannot be drilled out to fit the 3/8 throttle / mixture cables that Vans supplies??

[koda2]

Yes you can drill out the grommets. But it is a PITA.




But there is also a limit to the size because of the way the back of the eyeball portion is designed:



It took making a jig for me. Even then, this one is off a little bit.

I talked to the owner of the company when I was struggling with mine. He was a really nice guy and offered to try to do some special stuff if I couldn't get it to work but it ended up not being necessary.

You can do the Dan Horton trick for pass thrus but I had no luck getting stainless steel tubing bent.

Dave A.
6A build

[Ron RV8]

Thanks Dave

I ended up using conduit box connectors with fire sleeve and it worked out fairly well...