Firewall

Total hours: 1046.5
Firewall: 26.9

The firewall is a stainless steel plate that separates the cabin (and its occupants) from the engine. Stainless steel has a very high melting point making it a great firewall. But Van’s includes two “heat boxes” which plug holes in the firewall with valves. These valves will eventually be used to allow heat into the cabin to warm up passengers when it’s cold. These “heat boxes” were made of aluminum which has a very low (comparatively speaking) melting point making them bad firewall protection. I decided to return the aluminum heat boxes to van’s and I bought some stainless steel heat boxes from Aircraft Spruce. The price differential was about $55 or so. (more for the stainless). Then the plans also instructed to plug some holes in the “recess” with proseal (tank sealant). The “recess” is a stainless steel box which is riveted onto the firewall and allows for some extra room in the engine compartment. Plugging these holes is intended to block Carbon Monoxide from getting into the cabin from the engine. But proseal? I figure that stuff will burn off in seconds if there were a fire, allowing smoke to pour into the cabin area. So I bought some 3M Fire Barrier 2000+ from Aircraft Spruce to use instead of proseal. As usual, I made a sloppy mess with this stuff. But the holes are sealed and it doesn’t look entirely horrible.

Heat boxes:    http://www.aircraftspruce.com/catalog/eppages/heaterbypass3.php?clickkey=4967
3M Fire Barrier 2000+:    http://www.aircraftspruce.com/catalog/appages/firewall2000caulk.php?clickkey=90036

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rv10 firewall
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rv10 firewall with heat boxes
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rv10 firewall
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