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A couple of points:
1) My copy of ASTM spec D910 page 0539 states that the allowable TEL content of 100LL avgas is 2 milliliters per gallon NOT 2 grams per gallon. This means there will be over 1/3rd pound of lead in an 80 gallon tank of 100LL, plus about 1/5th pound of ethlylene dibromide scavenging agent. 2) My muffler "failures" were from the internal flame tubes, which must be present and in reasonable condition if they were originally present when new, but are not required on later mufflers that did not have the internal flame tubes. We did a proctoscope exam with a small flashlight at annual to verify their condition. Our engine was run about 50 deg rich of peak, or so we thought as we had only a single EGT probe. There was little engine roughness though if the mixture was leaned further. Manifold pressure was set to 21 inches for cruise, less at higher altitudes. I suspect many 172s were just run until the flame tubes were all gone out the tailpipe. |
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