David Leonard wrote:

When I used to be a part owner of a C140 with an STC for auto fuel, the
mechanic used to remind us to make sure we put in a tank of 100LL every
three or four tanks in order to "properly lubricate the rings."
Apparently the lead deposits are an excellent lubricant in addition to
being an annoyance.

I have begun to wonder if lead (i.e. whenever using avgas) might be
enough to lubricate our apex seals or drastically reduce the amount of
oil needed.  Unfortunately, there is no good way to test this question
that I can think of.

David Leonard
The Rotary Roster:
http://members.aol.com/_ht_a/rotaryroster/index.html

I have heard of a guy flying his rotary powered airplane from Tennessee to

NY State

without oil in the fuel. Perhaps he was using 100 LL

Paul Lamar

Residue from leaded fuel combustion  frequently acts as an anti sieze
compound. Older auto engines suffered valve seat regression
with unleaded fuel Vance

 
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