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air.guerner(at)orange.fr
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 Posted: Wed Feb 25, 2009 1:45 am Post subject: Alcoholic Mogas |
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Hi all,
During the last few days, I tested several samples of Mogas (all purchased in the Paris area) to determine if they were containing alcohol. The results are as follows:
95 Unleaded from a supermarket: about 2,5 % alcool
95 Unleaded from a well known brand: about 2,5 % alcool
98 Unleaded from a well known brand: no alcool
For those not familiar with french designation of Mogas, 95 Unleaded is our basic mogas while 98 is Super.
Rotax says alcool in the fuel should be avoided but tolerates up to 5% (SI 912-016 R1) so we can assume there is probably no risk with the engine up to that ratio. I do not think there is a risk either with our fuel lines as most of us are using automotive hoses designed for mogas. Same for fuel pumps. But what about the fuel tank which is already subject to bulging and cracking even without alcool? What about fuel pressure sensors? Fuel flow sensors?
As more and more alcohol will be introduced in mogas in the near future, it would be beneficial to all of us to know better about its side effect on our fuel system. Looking fwd receiving documented answers from experienced people.
Regards
Remi Guerner
F-PGKL
[quote][b]
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craigb(at)onthenet.com.au
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| Posted: Wed Feb 25, 2009 2:22 am Post subject: Alcoholic Mogas |
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In case you are not aware the ethanol will only stay in solution with the petrol up to about 1% water saturation which in theory means your 70 litre fuel tank could contain 1.7 litres of straight alcohol in the bottom of the tank if it falls out of solution due to humidity etc. I doubt 1.7 litres would be enough to do any damage but its worth thinking about.
[quote] --
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gregoryf.flyboy(at)comcas
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| Posted: Wed Feb 25, 2009 2:35 am Post subject: Alcoholic Mogas |
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Remi,
It would be nice to find a station that consistently pumps gas without alcohol, amidst a sea of others that don’t. Here in the States, our regular fuel is about 87 octane. You must have good fuel.
Rumor has it that the Rotax will eventually be ok’d for ethanolized fuel up to 10%
Rumor also has it that the Rotax 912 TBO will be bumped up to 2000 hrs.
I heard this on the Ultra-Flight Radio program with Roy Beisswenger. The speaker (not directly related to Rotax) specified it as an “official rumor”, or something like that.
I am setting up my fuel lines to handle multi-fuel systems. I plan to never use ethanol fuel, unless in an emergency, but have decided to pretend I am going to use it, and build accordingly.
| Quote: | Looking fwd receiving documented answers from experienced people.
That’s a bit loaded, isn’t it? J, I have no experience with the poly tank, but It is widely used in many applications, and is chemically resistant to most things. I am (here it goes) ‘assuming’ that it will work well for alcohol gas. Subject to modification from what others have seen, of course.
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Since it is an “official rumor”, then I am doing this:
Do not archive
Regards,
Greg 914-XS-Tri (module not quite in, yet---eeks, there are too many small things to do)
From: owner-europa-list-server(at)matronics.com [mailto:owner-europa-list-server(at)matronics.com] On Behalf Of Remi Guerner
Sent: Wednesday, February 25, 2009 1:43 AM
To: Europa-List Digest Server
Subject: Alcoholic Mogas
Hi all,
During the last few days, I tested several samples of Mogas (all purchased in the Paris area) to determine if they were containing alcohol. The results are as follows:
95 Unleaded from a supermarket: about 2,5 % alcool
95 Unleaded from a well known brand: about 2,5 % alcool
98 Unleaded from a well known brand: no alcool
For those not familiar with french designation of Mogas, 95 Unleaded is our basic mogas while 98 is Super.
Rotax says alcool in the fuel should be avoided but tolerates up to 5% (SI 912-016 R1) so we can assume there is probably no risk with the engine up to that ratio. I do not think there is a risk either with our fuel lines as most of us are using automotive hoses designed for mogas. Same for fuel pumps. But what about the fuel tank which is already subject to bulging and cracking even without alcool? What about fuel pressure sensors? Fuel flow sensors?
As more and more alcohol will be introduced in mogas in the near future, it would be beneficial to all of us to know better about its side effect on our fuel system.
Looking fwd receiving documented answers from experienced people.
Regards
Remi Guerner
F-PGKL
[quote] [b]
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