Kevin,
Yes, mine is very quiet, but aren’t all 912s? Many people comment on how quiet my plane is. However, are you certain about you not having an inner tube? My exhaust gases enter from the four tubes into the main outside chamber of the muffler. At the center of the chamber is another tube running side to side with holes in them (as perhaps you can see from the picture). The exhaust must enter this inner tube to find their way out to the exit pipe; that is, at least before the tube broke on both sides. Makes me question why it broke. As sturdy a metal as the tube appears, it is amazing to me it broke at all. I wouldn’t think it would be flexing. I would need to weld both sides to repair it – and indeed this is probably what I will pursue. On the other hand, perhaps I could simply remove the tube and have an open chamber muffler. I never would have suspected my muffler to be anything but an open can.
I may start a separate thread to ask muffler questions, like ‘is the inside empty?’ and ‘are their consequences for gutting the inside of the muffler?’.
Thanks for helping with picture posting as well. I probably had too big file sizes. I am now trying with 400k files that total less than 900k. I see them below, but once I click submit, will they still be there.
Dennis
