Hi folks, wanted to invite your attention to an interesting item by
Daniel D. Whitney in the Summer Issue of "Torque Meter", the journal of
the Aircraft Engine Historical Society. His article addresses the use
of the only airport gas sold for piston aircraft engines today, 100LL,
in Warbird engines originally intended for 100/130. 100LL uses only
half the lead of the obsolete 100/130, but is intended to have the same
octane rating. 100LL has a goodly content of benzene and toluene to
achieve this.
The bottom line of the article is that it has been found that if 100LL
is run 9% richer than 100/130 it proves to be just as knock-free and
will produce the same power in a blown warbird race engine.
The point for us, in my opinion, is that this 100LL is a good racegas
for anybody who is not restricted by 'event gas' rules for gas racing.
My local airport(and a million others in this great land, I assume)
sells it over the counter for about $1.80 legally to anybody with a gas
can for use in off-road boats or vehicles, from a self-service pump.
'Big Brother' inside the pump computer wants to know your 'tail number',
but seems content when you punch in ABCD 1234. He has his number. I
can testify that this 100LL worked fine in my Ardun at 11.5 compression
at ECTA before we went to event gas. Bill Hoddinott
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