View Full Version : Fuels
Dick B in KY
07-19-2014, 03:29 PM
Question for the masses: Have you had any problems mixing auto fuel with 100LL avgas (while using Decalin), or switching back and forth? I have a 912ULS and have been using auto fuel (93 octane) but getting ready to switch over to avgas. Thanks for the inputs.
Dick B
Dave S
07-19-2014, 05:17 PM
Dick,
Never had any problem with mixtures. I never have a constant ratio - just whenever on a trip and +octane auto is unavailable I fill up with 100LL and add the amount of Decalin per gallons of 100LL according to the instructions on the Decalin jug. Overall I don't average very much AVGAS - probably less than 10%. I believe Rotax indicates any more than 25% 100LL - the more frequent oil change kicks in. One FBO in Iowa premixes 15% 100LL with +octane auto and pumps that for a lot of their experimental types.
The Oil and plugs certainly seem to stay clean with the majority of fuel Autogas.
I just keep the jug of Decalin in the back storage all the time.
When using 100LL - be sure you run semi synthetic engine oil which works with both fuels.
Dave S
KF7 Trigear
912ULS Warp Drive
Dorsal
07-20-2014, 02:45 AM
I use mostly 100LL with occasional Mogas, always add Decalin when filling with Avgas, no problems. I also run Aeroshell Sport Plus changed every 25hrs.
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