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Muffler Mounting 
The exhaust port was removed and rotated 180 degrees so that the EGT probe would come up from the bottom. This change saves the weight of about six inches of lead wire.
The little round donuts sticking out from above and below the exhaust port mounting bolts were to be used as spring anchor points to hold the pipe bell in place. I found the springs too short. Also if these anchor positions were used, the springs would lie in contact with the bell. I removed the donuts, and used pieces cut from one inch angle iron as replacments.
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When the factory supplied mounting holes were used, I found that the muffler profile was not centered or level. The muffler was rotated until it centered and a new mounting holes were drilled through the muffer bracket and the supporting arm. Then the muffler was leveled.
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When the muffler was leveled, the mating surfaces did not match between the muffler bracket and the support arm from the engine fly wheel cover. JB Weld was used to fill in the gap and to level the lower arm surface so the mounting bolt would tighten down onto a true surface. A small bolt with fender washers was placed through the original mounting hole to hold the two muffler support brackets together. I believe the second support bracket could be removed with out ill effects.
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After the muffler was mounted, I banged it around a little to see how it was going to react to vibration. The heaviest part of the muffler is the most unsupported part of the muffler. If I hit it on the side the muffler and pipe would rotate about the bolt holding the muffler to the engine support arm. To stop this rotation and possible wear to the mounting bolt, a clamp was made to stabilize the aft end of the muffler.
The clamp is made from two pieces of stainless. It is shaped so that it conforms to the outlet section of the muffler. A stainless steel hose clamp passes under the outlet section and over the two conforming clamp pieces and holds them in intimate contact and stabilizes the unsupported end of the muffler. |
One can rotate the angle iron brackets so that the springs clear the pipe bell. Also they reduced the distance between attachment points and this reduces the force required to connect the springs. Additional holes were drilled in the angle iron brackets so that a safety cable can be run through the springs, pipe loops and the brackets. This cable will prevent broken springs from passing throught the propeller.