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-   -   Ethanol Free Fuel Issue (https://vansairforce.net/community/showthread.php?t=133442)

tomkk 01-13-2016 08:47 PM

Quote:

Originally Posted by ben barron (Post 1045248)
Is the an additive one can put in to get the octane from 90 to 92?

Mix with 100LL ...

johngoodman 01-14-2016 07:24 AM

Quote:

Originally Posted by RFSchaller (Post 1045234)
What filters are you guys referring to? The gascolator or an inline filter you use during fueling?

I have a 40 micron reusable filter inline between the wing tank and the fuel system, on each wing. I have another filter just before the engine at 10 microns, but it's a throw away. The inline filter was put there to catch loose proseal, but it will catch anything else that's there. My engine is an auto conversion, so there are differences in fuel delivery.

John

WingedFrog 01-14-2016 07:38 AM

Quote:

Originally Posted by tomkk (Post 1045250)
Mix with 100LL ...

... and use http://www.serioussolutions.com/evo/octcalc.htm

WingedFrog 03-24-2016 01:22 PM

A little update: I found a Sunoco service station serving 93 octane ethanol free premium a month ago but... on my last trip it had gone down to 91! The owner says he will know in April if it goes back to 93 (that would be for summer). In the mean time he sells an "octane booster" additive that claims to bring the octane of a 17 Gal. load to 100 octane. I checked the container but there were no indication of the composition of the content. I doubt Rotax would agree to support such mixture under warranty.
Back to ethanol fuel for the time beeing.

tomkk 03-24-2016 01:58 PM

Quote:

Originally Posted by WingedFrog (Post 1064863)
A little update: I found a Sunoco service station serving 93 octane ethanol free premium a month ago but... on my last trip it had gone down to 91! The owner says he will know in April if it goes back to 93 (that would be for summer). In the mean time he sells an "octane booster" additive that claims to bring the octane of a 17 Gal. load to 100 octane. I checked the container but there were no indication of the composition of the content. I doubt Rotax would agree to support such mixture under warranty.
Back to ethanol fuel for the time beeing.

91 octane should be OK, shouldn't it?

funflying 03-24-2016 02:18 PM

I've used ethanol free 91 without issue. I have 110hrs over 3 years now.

DaleB 03-24-2016 02:20 PM

From my copy of the POH:
Quote:

Approved Fuel Types

100 LL Aviation Fuel
or (91 AKI) Premium
Unleaded Automotive

f1rocket 03-24-2016 05:22 PM

Quote:

Originally Posted by DaleB (Post 1064878)
From my copy of the POH:

Actually, everyone flying a Rotax should be referencing the Rotax Service Instructions for use of the proper fluids in and on your engine. They change sometimes. The proper service instruction is SI-912-016R8 (as of today). Here's the link.

Lots of good stuff here. Its "must read" material for properly maintaining your Rotax.

tomkk 03-24-2016 06:59 PM

Quote:

Originally Posted by WingedFrog (Post 1064863)
A little update: I found a Sunoco service station serving 93 octane ethanol free premium a month ago but... on my last trip it had gone down to 91! The owner says he will know in April if it goes back to 93 (that would be for summer). In the mean time he sells an "octane booster" additive that claims to bring the octane of a 17 Gal. load to 100 octane. I checked the container but there were no indication of the composition of the content. I doubt Rotax would agree to support such mixture under warranty.
Back to ethanol fuel for the time beeing.

I may have inadvertently gotten us sidetracked. My original response was more aimed at why the 91 octane ethanol free wasn't good enough and necessitated "Back to ethanol fuel".

N941WR 03-24-2016 07:04 PM

Quote:

Originally Posted by N427EF (Post 1045003)
Randy has it exactly right.
I cannot understand this crazy obsession with not wanting to use
E10.....

If you saw the aluminum float bowl of one of my generators after sitting idle for just a few months, you would NEVER put that trash in your plane!


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