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richard.goode(at)russiana
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 Posted: Mon Jul 26, 2010 8:21 am Post subject: Mogas etc |
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I would not take such as dismal view as Jan Mevis.
Clearly AvGas is a “minority” fuel, and there will be good commercial reasons to stop producing it.
However, in the old car world in the UK, we have had the same issues, and there are a number of products that can be bought, which actually contain tetra-ethyl-lead. Some products contain different chemicals, but with similar effect.
These have the same effect as lead in terms of valve-erosion etc but also increase the octane rating. The costs are significantly less than the current UK difference between Mogas and AvGas. However it does not solve the potential problem of vaporisation.
Richard Goode Aerobatics
Rhodds Farm
Lyonshall
Herefordshire
HR5 3LW
United Kingdom
Tel: +44 (0) 1544 340120
Fax: +44 (0) 1544 340129
www.russianaeros.com
[quote][b]
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jan.mevis(at)informavia.b
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| Posted: Mon Jul 26, 2010 11:00 am Post subject: Mogas etc |
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Well, the future will point it out. I hope that I’m wrong, Richard.
Indeed, in the UK you can even buy the tetra-ethyl lead in the oldtimer-circuit but it is quite expensive.
I’ve looked in depth at all the different “ersatz”-products for the TEL, most of them are simply very toxic.
BR,
Jan
From: owner-yak-list-server(at)matronics.com [mailto:owner-yak-list-server(at)matronics.com] On Behalf Of Richard Goode
Sent: maandag 26 juli 2010 6:21
To: yak-list(at)matronics.com
Subject: Mogas etc
I would not take such as dismal view as Jan Mevis.
Clearly AvGas is a “minority” fuel, and there will be good commercial reasons to stop producing it.
However, in the old car world in the UK, we have had the same issues, and there are a number of products that can be bought, which actually contain tetra-ethyl-lead. Some products contain different chemicals, but with similar effect.
These have the same effect as lead in terms of valve-erosion etc but also increase the octane rating. The costs are significantly less than the current UK difference between Mogas and AvGas. However it does not solve the potential problem of vaporisation.
Richard Goode Aerobatics
Rhodds Farm
Lyonshall
Herefordshire
HR5 3LW
United Kingdom
Tel: +44 (0) 1544 340120
Fax: +44 (0) 1544 340129
www.russianaeros.com
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[quote][b]
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jan.mevis(at)informavia.b
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| Posted: Mon Jul 26, 2010 11:24 am Post subject: Mogas etc |
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Have a look at this:
http://www.epi-eng.com/aircraft_engine_products/demise_of_avgas.htm
BR,
Jan
From: owner-yak-list-server(at)matronics.com [mailto:owner-yak-list-server(at)matronics.com] On Behalf Of Jan Mevis
Sent: maandag 26 juli 2010 9:00
To: yak-list(at)matronics.com
Subject: RE: Mogas etc
Well, the future will point it out. I hope that I’m wrong, Richard.
Indeed, in the UK you can even buy the tetra-ethyl lead in the oldtimer-circuit but it is quite expensive.
I’ve looked in depth at all the different “ersatz”-products for the TEL, most of them are simply very toxic.
BR,
Jan
From: owner-yak-list-server(at)matronics.com [mailto:owner-yak-list-server(at)matronics.com] On Behalf Of Richard Goode
Sent: maandag 26 juli 2010 6:21
To: yak-list(at)matronics.com
Subject: Mogas etc
I would not take such as dismal view as Jan Mevis.
Clearly AvGas is a “minority” fuel, and there will be good commercial reasons to stop producing it.
However, in the old car world in the UK, we have had the same issues, and there are a number of products that can be bought, which actually contain tetra-ethyl-lead. Some products contain different chemicals, but with similar effect.
These have the same effect as lead in terms of valve-erosion etc but also increase the octane rating. The costs are significantly less than the current UK difference between Mogas and AvGas. However it does not solve the potential problem of vaporisation.
Richard Goode Aerobatics
Rhodds Farm
Lyonshall
Herefordshire
HR5 3LW
United Kingdom
Tel: +44 (0) 1544 340120
Fax: +44 (0) 1544 340129
www.russianaeros.com
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[quote][b]
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mark.bitterlich(at)navy.m
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| Posted: Mon Jul 26, 2010 2:05 pm Post subject: Mogas etc |
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Maybe there is a middle ground here. Supercharged engines are the most
at risk really, as are ones running high compression pistons, up near
10:1 or higher. There are head temperature issues, but a racecar engine
running about 9.7:1 compression ratios using aluminum heads can normally
operate with 93 octane auto fuel. However these heads have hardened
valve seats and other modifications to take care of the valve erosion
issues. The M-14P seems to be perfectly happy with a 50/50 mix of 100LL
and car gas.. And some claim it is perfectly ok using 100%. Yes, vapor
is an issue.
While there are a number of additives that claim to have TET in them, I
have to say that in this country that is doubtful. The Feds are really
serious about that stuff here and you just can not buy it over the
counter. Typically a case of false advertising. What you have in your
country Richard, I just can not say and while I am not saying you are
incorrect, I will say that I would look at such products with caution.
What they advertise is one thing, what they actually contain and what
they actually do could be something else. Just saying.
Additionally, in this country, it is now getting harder and harder to
find auto-fuel that does not contain a significant amount of Ethanol.
Say what you will (anyone) but I am scared of that stuff and have SEEN
some of the damage it can do with aircraft systems. Our FAA has
basically PROHIBITED the use of any auto fuel containing Ethanol in
aircraft, so it is obviously not a trivial concern.
An interesting side-bar discussion is the development of "Switch Grass"
fuel. A company in the U.S. claims to have developed a viable
alternative for 100LL using Switch Grass. A Bio product. We'll see,
but it is apparently a serious effort. They are test flying it now.
Since my UTVA-66 runs a GSO-480 with a little over 10 POUNDS of Blower
Boost (I pull a tad over 48" of manifold pressure on takeoff) the loss
of 100LL would basically mean the end of that engine. I'm looking at a
Walter Turbine.  Or maybe a really cheap sale of a nice aircraft.
Mark Bitterlich
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