"MW" == Matt Whiting writes:

MW Scott wrote:
FOUL!! 100LL has 4 times the lead content than the old 80
avgas and a LOT more than unleaded auto! Therefore, the 100
octane valves should be supper lubricated! But, in fact, the
80 octane valve tend to stick if much 100LL is run through
them... So, somebody answer my question...what is special
about 100 octane valves? The ones I put in my A-65 were
Stellite. What does Stellite do? What about sodium filled
valves? What's their claim to fame?? Scott
Matt Whiting wrote:
Scott wrote:
Like I said, MIGHT OK, if there is no difference in heat,
what are the 100 octane valves in my A-65 for? Or more
generally, why do they sell 100 octane valves for A-65s and
C-85s, etc. that were certified on 80 octane??? Like I said,
I use them, I don't wrench on 'em


Because valves that were designed to be lubricated by the lead
in leaded fuel may not last long when using fuel with no or
less lead.

MW No kidding. What's your point? I know that 100LL has a lot
MW more lead than 80. That doesn't change the correctness of my
MW statement.

Your statement may be correct but is irrelevant. The OP asked "what
is different about valves designed for 100LL in an engine originally
designed for 80 octane avgas (which has a fraction of the lead as
100LL). You answered the reverse question.
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