I knew that I need some kind of firewall penetration system to keep a major fire in the engine from entering the cabin. Hopefully, this event will never happen. More commonly, though, CO can escape from the exhaust system. Without a gas-tight firewall, that CO could enter the cabin and put out the pilot, brining down the airplane.
I had planned on using the Cessna split gromet until I found this system.
It is comprised of a stainless steel fiting that mounts to the firewall. It is sealed to the firewall with 3-M fireproof silicon. Next an outer firesleeve is clamped on. Wires are then run through it. Finally, another section of fire-sleeve is pushed through the first and through the firewall to cushion the wires from the metal flange. The whole assembly is then caulked with more 3-M material and a second clamp is secured around that assembly to make the system gas-tight.
It looks very good, solving severall problems at once - gas sealing, abrasion resistance while making a neat assembly.
I have more wires to pull through for the EDM - but all should fit just fine.
