MoGas Tips, Tricks, Concerns, How To

("M" wrote)
So you point is that lead scavenging agent isn't needed because there's
not that much lead in the 100LL?


My curiosity was: What quantity (by weight) of lead is in 100 gallons of
100LL?

I picked 100 gallons because I didn't want some small fraction. As it turns
out, 2 grams/gallon is not a small fraction.

I used the term "actual lead" because I wanted to know the amount of lead
left behind if "everything" else were to be distilled away.

My side point was: Lead = "ATTACK!" to the Greens ...1 gram, 2 grams, 15
grams, 0.14 grams, doesn't matter to them - it's LEAD!!!

[Thanks to Jim L]
From http://en.wikipedia.org/wiki/Avgas :
"Avgas 100LL contains a maximum of 2 grams of lead per US gallon"

1,000 grams (kilo) = 2.2 lbs
500 gallons of 100LL = 2.2 lbs of lead.

Now the world make sense to me.


Montblack
"Hello, Thielert..."

http://www.dieselair.com/
Diesel updates for airplanes

I see. My point on the other hand has nothing to do with the lack of
greeness of 100LL. My point is that the bromine in the lead scavenging
agent is corrosive to the engine after the combustian event. We live
with it because the high compression engine needs it to get rid of the
lead. But for 1:7 compression engines this corrosive compound is an
entirely unnecessary evil because the engine doesn't need the extra
octane from TEL. By getting rid of TEL we get rid of bromine in the
engine (lead bromide reacts with water to form hydrobromide acid). Too
bad mogas is the only unleaded fuel we can get for our LC engines at
this point.

("M" wrote)
Too bad mogas is the only unleaded fuel we can get for our LC engines at
this point.


What would your unleaded fuel of choice be?

How would it be different than MoGas?

Um, hydrogen? propane? 100% ethanol?


Montblack

An unleaded aviation fuel with the same quality control and tracking as
100LL would be ideal. Unfortunatley that's not going to happen anytime
soon. For the time being I'll just keep doing my own alcohol test and
filling up with mogas.

"MB" == Montblack writes:

MB What would your unleaded fuel of choice be?

Good old 80/87. But that's not coming back.

"Bob Fry" wrote in message ...
"MB" == Montblack writes:

MB What would your unleaded fuel of choice be?

Good old 80/87. But that's not coming back.


Uhhh, 80/67 had lead in it....

Uhhh, no it didn't. It was allowed a MAXIMUM of 0.5 ml / gallon of TEL, but
from the '50s on, the actual TEL count was zero in 80.

Jim



".Blueskies." wrote in message
. net...

"Bob Fry" wrote in message
...
"MB" == Montblack writes:

MB What would your unleaded fuel of choice be?

Good old 80/87. But that's not coming back.


Uhhh, 80/67 had lead in it....

"RST Engineering" wrote in message .. .
Uhhh, no it didn't. It was allowed a MAXIMUM of 0.5 ml / gallon of TEL, but from the '50s on, the actual TEL count
was zero in 80.

Jim


Thanks Jim. That's the first I had heard that...but it was not declared as no-lead fuel, so the post asking for what was
the favorite unleaded fuel was a loaded question, eh?

"Montblack" writes:

Too bad mogas is the only unleaded fuel we can get for our LC engines at
this point.

What would your unleaded fuel of choice be?


#2 Diesel....

--
A host is a host from coast to
& no one will talk to a host that's close........[v].(301) 56-LINUX
Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433

Perhaps a more useful comparison would be how much
lead is/was in 80/87 vs 100LL?

Those of use with older, low compression engines that were designed
to run on 80/87 may be introducing 4 times the amount of lead into our
combustion chambers by running 100LL than the original designers had
intended for.

80/87 has a maximum of 0.5 grams of lead per US gallon while 100LL has
a maximum of 2.0 grams of lead per US gallon. Unleaded Mogas is...
well... Unleaded!

In reading about this somewhere (AvWeb? EAA?) I recall words to the
effect that the refineries can get up to about 97 octane without any
lead, and they only add as much in to get to (or slightly exceed) the
100 octane rating.

I have the EAA Mogas STC for my C-170B, and the paperwork states if
you mix a certain amount of 100LL with unleaded Mogas (25% to 75%),
you get approximately the same amount of lead as you would have had
with a tank-full of 80/87.

For what it's worth, my O-300 absolutely *hates* straight 100LL (way
too much lead). Aggressive leaning, both on the ground and in the
air, can extend the time between fouled pugs and stuck valves, but
both are virtually inevitable without a lead scavenging agent (like
TCP) or using Marvel Mystery Oil, etc.

I burn Mogas on local flights and when/where I can get it on cross
country flights. When I have to fuel up with straight 100LL, I add
TCP.

Not only is the Mogas cheaper, I no longer have to worry about
fouled plugs and stuck valves! (aka a "no-brainer"). 8^)

Bela P. Havasreti