Firewall Heat Insulation

Companies providing Firewall Heat Insulation

• Heatshild Products Lava Mat 781003 at Amazon
• 3M Fire Barrier Silicon at Amazon
• Stainless Steel Heater Bypass Valve at Spruce
  During engine fire, it prevents melting of aluminum flap that Vans stock RV-10 valve has as of 2/2022.
  Has air dam that prevents valve from being blown open slightly by airflow.

Notes on the "hot tunnel" issue

• It may come from partially closed valves, using the SS valve solves that issue.
• It is caused mainly by hot air blowing at the valve even when the valves are closed (bypass mode). Heat-shielding the firewall area around it addresses that. Also putting heat shield material between the valve and the firewall.
• It some point, Vetterman, who makes the RV-10 stock exhaust, addressed the issue, and reduced the BTU output of the heating elements. Therefore less hot air blows against the closed valves and the heating capacity is still plenty for the RV-10 when the valves are open. There are builders with everything stock and no "hot tunnel" issue. When exactly that change was made is TBD, some years before 2022 at least.