I have heard said that you can use Avgas if you use a particular oil but
otherwise the 912 is designed to run on unleaded. I have always used
unleaded in my two stroke Rotax and I shall do the same in my 912. The CAA
say many things and what they say aimed at people who fly Continentals may
not be the same as what they would say to someone with a 912.
I repeat my earlier warning that you should not use super unleaded ( high
octane unleaded ) as it has constituants more likeley to vapourise. Avgas
is probably the most stable in this respect. That's my opinion only and you
ought to talk to someone who knows what he is talking about.
Jerry
----------
> From: Martin J.Tuck <102034.2747@compuserve.com>
> Subject: Fuel types
> Date: 05 March 1998 01:16
>
> Fuel Types
>
> My Rotax 912 has arrived and I was quite surprised to see what the manual
> has to say about fuel types.
>
> Sure it confirms Europa's statement in the most recent newsletter which
> says that Rotax approve leaded and unleaded mogas as well as Avgas 100LL,
> but the manual also states that because of the higher lead content in
Avgas
> 100LL, the wear of the valve seats and deposits in the combustion chamber
> will increase. Therefore, it adds, use Avgas only if you encounter
problems
> with vapour lock or if Mogas is not available.
>
> I was planning to use just Avgas as although Mogas is currently 97 cents
a
> gallon the gas station is in the opposite direction to the airfield I am
> planning to fly from and the least time spent on the Kansas roads during
> the transportation process the better.
>
> I was wondering if - as probably most of the UK flyers use 100LL,
> particularly as the CAA safety leaflet 'use of mogas' which came with the
> Europa owners manual states that you can only use leaded 4-star -
unleaded
> Mogas not being permitted (we can't get leaded mogas here now) that most
of
> you are using 100LL.
>
> 100LL does have its benefits. It doesn't have such a lingering smell as
> mogas and doesn't stain your tank red. Its also readily available where
you
> fly your aircraft from.
>
> Is the Rotax statement just another 'there for liability' reason (like
many
> of the other statements regarding the use of the engine) or have
operators
> found engine wear caused by the use of 100LL?
>
> I would be interested to hear.
>
> Regards
>
> Martin Tuck
> N152MT
> Wichita, Kansas
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