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I found that a 1/8" NPT to 1/8" (clears a 1/4" OD pipe/control cable easily) copper compression fitting did wonders on control cable penetrations. I cut the compression ring once with a hack saw so that after tightening the compression nut, you could un-tighten it and then move or remove the control cable and re-tighten. This makes an almost gas tight connection (it can't because of the spiral wire wrap of a control cable and because the control cable itself is not gas tight.) But it holds the control cable reliably and in the instance of our 360 where it was going through the SS can in the fire wall for the prop pitch control, this was important as that penetration was subject to push/pull pressure as the pitch was adjusted. Movement of the cable would not be a good thing.
Regards,
Charles R. Patton
On 5/12/2012 10:14 AM, Colyn Case wrote:/
Hi Lancair listers,
I wonder if anyone has come up with a good way to seal holes in the firewall where control cables and other wires come through?
I have the rubber grommets, which I've heard don't seal well in case of fire in the engine compartment.
I'm not really interested in bulkhead connectors for the wires at this point.
Colyn
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