I understand your comment about the lack of lubrication from auto fuel,
but I was talking about 100LL...I never mentioned auto fuel in any of my
posts. I'm looking for an answer to why it was suggested that I put 100
octane valves in my A-65 if I was going to burn 100LL (I could have
replaced my valves with the standard 80 octane valves and continued to
burn auto fuel with Marvel Mystery oil mixed in for valve lubrication).

Scott


Matt Whiting wrote:
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.

Matt



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

Matt

--
Scott
http://corbenflyer.tripod.com/
Gotta Fly or Gonna Die
Building RV-4 (Super Slow Build Version)