MoGas Tips, Tricks, Concerns, How To

"nrp" writes:


Mogas users have to get this situation changed. Some day 100LL is
going to disappear by an EPA mandate & then where will we be? I feel
the 100LL users are whistling in the dark as no substitutes seem to be
forthcoming to their leaded fuel.


I have to agree; the refiners want to dump any TEL product; the EPA wants
them to do so; the whole national market is the size of a decimal point
to the distribution side.....


--
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

A couple of points:

1) My copy of ASTM spec D910 page 0539 states that the allowable TEL
content of 100LL avgas is 2 milliliters per gallon NOT 2 grams per
gallon. This means there will be over 1/3rd pound of lead in an 80
gallon tank of 100LL, plus about 1/5th pound of ethlylene dibromide
scavenging agent.

2) My muffler "failures" were from the internal flame tubes, which
must be present and in reasonable condition if they were originally
present when new, but are not required on later mufflers that did not
have the internal flame tubes. We did a proctoscope exam with a small
flashlight at annual to verify their condition. Our engine was run
about 50 deg rich of peak, or so we thought as we had only a single EGT
probe. There was little engine roughness though if the mixture was
leaned further. Manifold pressure was set to 21 inches for cruise,
less at higher altitudes.

I suspect many 172s were just run until the flame tubes were all gone
out the tailpipe.

"nrp" wrote in message
oups.com...
A couple of points:

1) My copy of ASTM spec D910 page 0539 states that the allowable TEL
content of 100LL avgas is 2 milliliters per gallon NOT 2 grams per
gallon. This means there will be over 1/3rd pound of lead in an 80
gallon tank of 100LL, plus about 1/5th pound of ethlylene dibromide
scavenging agent.

Aside from the curiousity of mixing gallons and metric measurments, 2
gr/gallon is 160 grams in an 80 gallon tank. 160/454=0.3524 lbs, so it's
virtually the same thing. SAW, 160 gr in a tank that holds 36,320 grams, 1/3
lb in a tank holding 480 lbs.

It is close, as TEL is only about 2/3 lead by weight. The molecular
weight of TEL is 323 according to my chemistry book, and the tetraethyl
part is about 116. The net numbers work out as you indicated. The
spcific density of TEL is 1.659 gm/ml.

That's indeed quite a bit, huh? If I take a 1/3lb lead ball to a C-206
flyer and tell him that's how much lead there is in his full tanks, I
bet he'll be surprised.


nrp wrote:
A couple of points:

1) My copy of ASTM spec D910 page 0539 states that the allowable TEL
content of 100LL avgas is 2 milliliters per gallon NOT 2 grams per
gallon. This means there will be over 1/3rd pound of lead in an 80
gallon tank of 100LL, plus about 1/5th pound of ethlylene dibromide
scavenging agent.

"M" wrote in message
ups.com...

That's indeed quite a bit, huh? If I take a 1/3lb lead ball to a C-206
flyer and tell him that's how much lead there is in his full tanks, I
bet he'll be surprised.

How big do you think that ball would be?