Mike, my practical "in a nutshell" advise would be to use the highest octane
rated Mogas you can buy, which is usually 93 octane. If you can't get
Mogas, then use 100LL. This advise goes for any Rotax engine, i.e.: 912,
912S or 914. As to oil and filter changes you can safely go to 100 hours if
you use exclusively Mogas, but since it's cheap I usually change mine around
50 hours. If you use 100LL exclusively I'd change my oil closer to every 50
hours since the lead in the gas will find it's way into the oil. This
advise is based on 6 years of flying with my trigear 914.
A word of caution to 914 users. The exclusive use of 100LL fuel WILL sooner
or later cause "sticking" of the turbo wastegate butterfly valve. When this
happens, you will not have a flyable airplane. The solution is to regularly
spray the wastegate valve with a penetrating spray. In the US I have found
a product called "Blaster" works miracles. Also, you can add TCP additive
to your fuel, but it's hard to find. Exclusive use of 100LL also will cause
your fuel filters to clog quicker, and your spark plugs to foul quicker.
Regards,
Garry Stout
N4220S, A60, Trigear, 450 hours.
----- Original Message -----
From: "MICHAEL PARKIN" <mikenjulie.parkin@btopenworld.com>
Subject: Re: Europa-List: gas mixing
> <mikenjulie.parkin@btopenworld.com>
>
> OK, I am now officially confused. Mogas, Avgas, RON, MON, oil changes at
> 50hrs or 25hrs with Avgas? According to my Rotax maintenance manual, oil
> changes are required at 100hr intervals. What am I missing.
>
> regards,
>
> Mike
>
> ----- Original Message -----
> From: "R Holder" <rholder@avnet.co.uk>
> To: <europa-list@matronics.com>
> Subject: Re: Europa-List: gas mixing
>
>
>>
>> kenneth b. carpenter wrote:
>>> carpenter" <kbcarpenter@comcast.net>
>>>
>>> Has anyone explored the issue of mixing 50/50 87
>>> octane auto gas with 100 LL to get 93 octane gas for
>>> 914T engines? I think 912S engines also need 93 octane
>>> gas. Sounds like it would be better for the engine
>>> than 100LL alone. Ken Carpenter N 9XS 914T
>>
>> Why not just use Auto gas !
>>
>> If you are carting auto gas into your hanger to mix it
>> with Avgas, why not just use auto gas ?
>>
>> 912 912S and 914 all run on Mogas (auto gas) and the oil
>> needs to be changed every 25 hours if more than 30% Avgas
>> is used. The oil changes are at 50 hour intervals if you
>> use Mogas.
>>
>> Mogas is also cheaper ($5 a US gal here in England)
>> compared with over $7 a US gal for AVGAS.
>>
>> Richard Holder
>> Europa TriGear G-OWWW High Cross
>>
>>
>>
>
>
>
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