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<< Lancair Builders' Mail List >>
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Tcm and Lyc and all
I had the pleasure of listening to some one that is seeing the end
result of what the E.P.A. have done to our engines that we put in our
planes. Remember that the engines that we are using in the planes were
certified back before the gas we use now, what was 115/145 or 100/115 is
now 100LL . I have known that the fuel was not good for the engines we put
in our planes but I didn't know how bad it really is . Now I'm not a chemist
put I'll try to repeat the problem as it is today the best I can with a
E-mail in a short time. The led content is gone and the LL stands for
long- lost not Low led , the gas companies are putting so many substitutes
in the gas that we have a different type of flame than we used to have back
when . The egt probe is in the wrong place on the engine and the hottest
part of the gasses are further down the pipe and if we fly by the egt we are
reading cooler the we REALLY ARE. Again remember the engine manufactures
wont change the speck for it is certified , now we fly by the book and
remember the book was invented [certified] and blessed back before the fuel
we now have and if we continue to fly the book we will have all the problems
that are occurring now . The engines will not go the distance . The engines
are also needing a higher fuel flow than what is being set at the factory.
At take off power according to my source we are to lean and need about 2%
more pressure than factory ,for we are burning up the engines with a lower
pressure than this engine requires with the fuel we have today. According
to my notes we need to raise the fuel pressure by 2% above the red line in
the take off 100% power area and fly the engines rich of peek [ @ 100%
power- peek +150 deg. , 75% power -peek +100 to125 degrees plus and 65%
power -peek + 75 to 100 degs. ] I was told that if this was told to a pilot
of a certified engine with cert. plane that he would be in jeopardy of
loosing his station license for it isn't by the book . Also if the pilot
runs out of fuel and someone gets killed using this way to fly the engines
rich of peek a lawyer would probably be chasing him around in a law suit.
The pilot thinks that he has the range and now he doesn't and crashes, well
stupid pilot. , well I think the gas companies should be right up front with
the epa and the engine manufacture in court, not the person that sees the
problem and says what has to be done to keep an engine to tbo.
The gas we have now has a vary large % of toluene , a by
product of refracting the gas is now put back in it at a rate of 38% verses
7% years ago This is basically what is one of the main factors that changed
the flame along with the loss of led . I could give the report to all but
these two are the main problems with the gas today . There are only two
companies that make the gas we use and they are chevron / [Texaco] and
cocaco . When you by Texaco it is chevron gas . This study was researched in
the western u.s. and the lab work to check the fuel was also done in the
u.s. . He even went on to say that he noticed that in different areas of
the country the gas that is pumped into planes based in several areas that a
particular brand of gas has shown a higher failure rate in that area than
else where. His blanket statement was that if you fly an a/c engine lean of
peek and by the book you will burn it up way before tbo. This info was
passed to me in a phone conversation with one of the best overhaul shops in
the country and they see it all first hand and did the fuel study because
the engines they rebuild were coming back with the same problems as the new
tsio 550 we are using, basically fried and worn out parts before their time
. He did say that an oil additive might help like marvel mystery oil but
not sure for how long the engine would last if lean of peek. Remember this
is an opinion from a re-man shop that sees many engines that are not making
tbo and this is the main reason for not going the distance according to the
source .
This is out for your comments and opinions . Fadec might help this problem
. I also asked him about liquid cooled engines and they are also coming into
the shop with the same problems , by the book setting and burned up or worn
out parts way before tbo .Bill Maddox N60L 4P
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LML website: http://www.olsusa.com/Users/Mkaye/maillist.html
LML Builders' Bookstore: http://www.buildersbooks.com/lancair
Please send your photos and drawings to marvkaye@olsusa.com.
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