James,  Good question on the back pressure.  I do not have a clue!  I calculated the amount of 1/4 inch holes to equal the area of the exhaust manifold and added 50% and kept drilling beyond that until I ran out of  somewhere to drill.   IF there is any difference and I expect there may well be, I no longer care as it fits (just) and seems to run very well.  It is certainly quiet or quieter!   Will the center pipe melt? Again time will tell.  I also this time did not put EGT probes in as they kept burning off and were a constant source of worry for me simply because I knew. Now I no longer know so I no longer worry, probably like the possible difference in back pressures.  Agriculture is my main trade which ,means I have learnt the art of compromise and how to be "rough". It simply has to work, and nothing is perfect. Cheers,


On 2/8/2017 8:43 AM, James R. Osborn wrote:

HI Neil,

I was confused by that photo at first, then realized it is a Renesis (side port exhaust), right?  So the output of the rear rotor (on the car, not airplane) goes to the center of the muffler and the other two swirl?  Do you expect any difference in back pressure for the different exits?

— James

On Feb 7, 2017, at 12:19 PM, Neil Unger <flyrotary@lancaironline.net> wrote:

photos show latest muffler which for some reason has taken the "bark" out of the note.  Yet to be fully tested beyond a few hours.  All done with slip joints and 321 S/S.  The OZ peasant. Neil

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