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Future 94 octane unleaded avgas

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ChangDriver

Joined: 15 Sep 2007
Posts: 266

Posted: Tue Feb 10, 2009 11:13 am Post subject: Future 94 octane unleaded avgas

From what I read, this may be the next avgas.  It is 100LL without the lead.  So, what are the implications for our engines regarding valves, valve seats and valve seals?



Craig

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jan.mevis(at)informavia.b
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Posted: Tue Feb 10, 2009 12:52 pm Post subject: Future 94 octane unleaded avgas

This is probably not a problem. In the engine books of the new engines

(M14R) the use of mogas is explicitly allowed:



"Gasolines as per US Standards ASTM-D4814, European Standards EN 228". For

the record, these books are in English, EXCEPT Chapter 15, par 3 , the

"Acceptance Statement" is still in Russian.



If it's allowed for such a supercharged engine, then I suppose it's OK for

the M14P also.



Jan Mevis



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mark.bitterlich(at)navy.m
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Posted: Tue Feb 10, 2009 2:44 pm Post subject: Future 94 octane unleaded avgas

Jan... With the valves, octane is not really the only issue.  The lead

acts

as a lubricant.  Without hardened valve seats, you will erode a standard

seat over time in any engine that was designed to use lead which

subsequently is operated without it.  I have seen this first hand in

many a

small block Chevy.  There is no question that without any lead content

at

all, there will be valve seat erosion in any engine without hardened

valve

seats.  The good side of the story is that it really does not take much

lead

at all to accomplish the goal.  FAR FAR less than what is in 100LL.   

Mark Bitterlich



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cjpilot710(at)aol.com
Guest

Posted: Tue Feb 10, 2009 3:09 pm Post subject: Future 94 octane unleaded avgas

In a message dated 2/10/2009 5:45:25 P.M. Eastern Standard Time,  mark.bitterlich(at)navy.mil writes:

  

  

 And there is always MMO!

  

 [quote]-->    Yak-List message posted by: "Bitterlich, Mark G CIV Det Cherry Point, MALS-14    64E" <mark.bitterlich(at)navy.mil>

Jan... With the valves,    octane is not really the only issue.  The lead

acts

as a    lubricant.  Without hardened valve seats, you will erode a    standard

seat over time in any engine that was designed to use lead    which

subsequently is operated without it.  I have seen this first    hand in

many a

small block Chevy.  There is no question that    without any lead content

at

all, there will be valve seat erosion in any    engine without hardened

valve

seats.  The good side of the story is    that it really does not take much

lead

at all to accomplish the    goal.  FAR FAR less than what is in 100LL.   

Mark    Bitterlich



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mark.bitterlich(at)navy.m
Guest

Posted: Tue Feb 10, 2009 3:17 pm Post subject: Future 94 octane unleaded avgas

As much as I love MMO,... Even the smell... I am afraid it is not a lead

substitute.  Even though yes, I know your tongue was in your cheek when

you said that!  



Mark

 



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jan.mevis(at)informavia.b
Guest

Posted: Tue Feb 10, 2009 11:11 pm Post subject: Future 94 octane unleaded avgas

Of course you're right. But the Russians take into account the rather small

lifetime of the engine. 500 TBO for a M14P, 300 hours for a M14PF, 100 hours

for a M14R



Jan



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mgdimarco

Joined: 20 Apr 2006
Posts: 23
Location: Kissimmee, FL

Posted: Fri Feb 13, 2009 8:24 am Post subject: Re: Future 94 octane unleaded avgas

The following comment is offered as an anecdotal experience and in no way guarantees future results.



I've been using mogas adding lead substitute for my Nanchang from Wal-Mart for eight years now along with MMO from the same source.  Most cylinders are still pulling 80/78 with a low of 80/74.



Mike

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_________________
Michael Di Marco
China Blue

mgdimarco@yahoo.com
407-608-3290

mark.bitterlich(at)navy.m
Guest

Posted: Fri Feb 13, 2009 11:25 am Post subject: Future 94 octane unleaded avgas

Good idea using the lead substitute.  



Having good compression is a good sign.  Using a borescope to inspect

them is also worth thinking about.  



Have you been using NOTHING BUT MO-GAS... Or on some cross countries

(for example) you put some 100LL in because nothing else was available?



Mark Bitterlich

 



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