rv9aviator
Well Known Member
I have a Vetterman crossover exhaust with mufflers on my RV-9A and because the mufflers are much closer to the cowl than just the pipes I was getting heat damage to the lower cowl after only 2 hours of flight. This is how I fixed the problem. This would be something to do before you ever fly as it will most likely become necessary. I only have one heat muff installed so the side without the heat muff puts off much more heat. Here are pictures of the mufflers with and without the heat muffs.
I have to give Dan Horton all the credit for the materials and how I did this. You take some 1/16 thick fiberfrax from ACS and cut a piece big enough to cover the effected area and then cut a piece of the self adhesive aluminum sheet from VANS 2 inches larger each side around the piece of fiberfrax.
Continued!
![DSC00394.jpg](/community/proxy.php?image=https%3A%2F%2Flh6.googleusercontent.com%2F-BWW5N6CdRo8%2FTihBeyzyg1I%2FAAAAAAAAAIc%2F88Q3VYsDG7I%2Fs800%2FDSC00394.jpg&hash=b26a42ad111013c10df91f41d115c52e)
![DSC00396.jpg](/community/proxy.php?image=https%3A%2F%2Flh5.googleusercontent.com%2F-rM7uLYeV_NU%2FTihBfBd4-2I%2FAAAAAAAAAIg%2FmA2tQmYG8Ps%2Fs800%2FDSC00396.jpg&hash=89f053f0b733ce5e8196ec88d3769471)
I have to give Dan Horton all the credit for the materials and how I did this. You take some 1/16 thick fiberfrax from ACS and cut a piece big enough to cover the effected area and then cut a piece of the self adhesive aluminum sheet from VANS 2 inches larger each side around the piece of fiberfrax.
![DSCN2810.jpg](/community/proxy.php?image=https%3A%2F%2Flh3.googleusercontent.com%2F-dOF0kKDvhMk%2FTihBfHZGv5I%2FAAAAAAAAAIk%2FlvlW8UcUhyg%2Fs800%2FDSCN2810.jpg&hash=8526e548e6f2e53ac5c3728a73cdd8e8)
Continued!
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