I just did an inspection of my muffler and found that it was basically
 coming apart inside.  This is a Burns Stainless, 17" 2-Stage muffler
 after 50 hours of flying behind a 2-rotor engine.  Now, it could be that
 50 hours is a reasonable life for something like this, I don't know.
 But, it certainly confirms the stories of muffler disintegration.  I've
 inspected this muffler several times over the last 50 hours, but this is
 the first time that I've seen damage.  But, when it comes apart, it
 really comes apart.  It is unfortunate, as the muffler was really
 effective in reducing the noise and was light-weight.

   Best Regards,

 Steve Thomas

 Thanks for the heads up Steve. My contention is put nothing inside
 unless it is a cooling tube with fresh air flowing through it.
 Here are a few alternatives.

 You might make the best of it and send it back to Burns.
 They might do a little free R&D to save face.

 Paul Lamar


 Maybe a stupid question. Can the cooling tube in the muffler be used
 for warm air to the cabin or would it be too hot?

 Pierre
 South Africa

 You can mix it with outside air. You do want to monitor CO however.

 Paul Lamar

On which aircraft you use this engine ?

Ivan