Posted for "John Perry" <tarkine@cox.net>:

To add to the mix of opinion of lean of peak operations on a TSIO 550, the
A36 that my partners and I fly has a Tornado Alley turbonormalizer with GAMI
injectors and a JPI monitor. We bought the plane at 509 hours, at which time
a major engine overhaul had been completed by the previous owner, which
included the installation of Millenium cylinders.  The plane now has 1490
hours. We change oil every 25 hours and get an oil analysis every time. The
reports have come back clean to date. There has been no burning of the
valves. The plane is flown by the Tornado Alley instructions by the numbers:
WOT (wide open throttle) @ 32? MP, 2500 RPM and cruise at 16-17 GPH. Peak on
the engine is 1605° F and it is flown at 1520° F equaling 85° LOP. The only
anomaly set we have experienced so far is the need to replace the plugs
every annual and the need to replace points every 250 hours. We think that
there is a greater than expected strain on the magneto-capacitor-wiring
harness-plug group caused by the LOP approach, but do not have an
explanation as to why this is so.
John Perry