On Thu, 10 Aug 2006 06:06:36 GMT, Don Tuite
wrote:


Thus the MON of autogas rated 87 octane is about 82, which makes it
about the equivalent of 80-octane aviation fuel.. Autogas with a pump
rating of 91 (premium) would be like 86-octane aviation fuel, if there
were such a beast.

(According to the site, aviation rich, the higher value in 80/87 is
only important in supercharged engines.)

That's a bit misleading. I have an IO-470N in the Debonair which
requires 100LL. There are a lot of high performance engines out there
that require 100LL and there aren't any STCs to replace that.


This site: http://www.cheresources.com/greengas.shtml

says refineries *can* use catalytic naptha reforming and/or fluidized
catalytic cracking to produce a bunch of stuff, but mustly MTBE and
tertiary amyl methyl ether (TAME). The other refinery products
available for blending have various problems including causing cancer
(benzine), releasing sulphur, and gunking up your tailpipe.

So I haven't found anything on-line (yet) that absolutely persuades me
that high-test isn't just regular with more alcohol in it. (Which is
the part of my screed that actually relates to this thread.

I don't know how to convince you, but here in Michigan about
everything has 10% Alcohol be it regular, mid-grade, or high-test.


Now for a slight change of direction. If you're writing your
legislators, one thing to remind them of is that we got the TEL out of
gasoline, NOT because it was making us sick (although I was never keen
on eating the blackberries that grow right alongside the highways
everywhere in Oregon), but because it destroyes catalytic converters.
And whatever anybody's opinion about catalytic converters is, nobody
is proposing CCs for the tiny piston-powered general aviation fleet.

Don't bet on it. My last lawnmower has one. I think the snow blower
has one too.

Roger Halstead (K8RI & ARRL life member)
(N833R, S# CD-2 Worlds oldest Debonair)
www.rogerhalstead.com
Therefore efforts to remove the TEL from aviation fuel for
"environmental" reasons are quixotic and contrary to good sense.

In fact, a good case could be made for a mandate that TEL in avfuel be
REDUCED from the current ridiculous levels to something that wouldn'f
foul sparkplugs without drastic leaning.

THAT would make everybody happy.

Don

Roger Halstead (K8RI & ARRL life member)
(N833R, S# CD-2 Worlds oldest Debonair)
www.rogerhalstead.com