Rotax fuel

by Herbert Hutchison in General Tech Discussion 11 years ago

My question relates to the best fuel for the Rotax 912 in my newly purchased 2008 LSA. Locally I have access to 91 octne (using the R-M/2 method)WITH 10% ethanol or 87 octane ETHANOL FREE, again using the R-M/2 method. Which is better for the performance and care of my Rotax?

Re: Rotax fuel

by Herbert Hutchison » 11 years ago

Herbert Hutchison

1 1 0

My question relates to the best fuel for the Rotax 912 in my newly purchased 2008 LSA. Locally I have access to 91 octane (using the R+M/2 method)WITH 10% ethanol or 87 octane ETHANOL FREE, again using the R+M/2 method. Which is better for the performance and care of my Rotax?

RESTATED QUESTION WITH CORRECTIONS TO OCTANE METHOD

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Re: Rotax fuel

by Roger Lee » 11 years ago

Roger Lee

125 5.12k 4.53k

Hi Herbert,

Providing your fuel tanks are okay with the ethanol the 91 oct. unleaded auto fuel is without a doubt better than 100LL.If you don't have to use 100LL don't. Most though have to use 100LL when they travel and most that use 91 oct. bring it to the field. Few airports have 91 oct. on field. Some have Mogas which is 87 oct.

The 912ULS needs 91 oct. or higher.
The 912UL can use 87 oct. or higher.
Yes you can mix 100LL and 91 oct. if you needed to.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

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Rotax fuel

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