Replies to This Discussion

Permalink Reply by David J. Beaulieu on April 17, 2018 at 9:50am

Hi Tom,  I'm using regular 93 octane auto fuel w/10% ethanol.  Not sure how I'm going to handle x-c trips yet.  I am thinking will mix 91 octane with a bit of 100LL if I have to.  Some have claimed to run lower octane without issue, (e.g.; 91  octane auto fuel) but I would be very reluctant to try that. In my mind, based on what I'm reading and hearing from others, worse case would be to run 100LL exclusively.  The CHT's do not get hot enough to burn lead deposits.  Ray Lawrence,  the UL guy down in Georgia with Kaolin Aviation would be a good person to query regarding fuel and lead with our UL engines. HTH!

Dave

• ▶ Reply

Permalink Reply by Tom Sullivan on April 17, 2018 at 10:02pm

Thanks David. Sounds like a mix of auto and 100LL is a good option. ON new engines, I've read that some lead should be in the fuel initially to help with the valve seats.

• ▶ Reply

Permalink Reply by Lynn S. Beckhorn on April 18, 2018 at 10:41am

I've been running 93 non-ethanol in my 260i for over 200 hrs.  have run 100LL with "Decolin" additive when traveling.  Just started running 93 with 10% ethanol in one tank.  No change in CHT/EGT,  Just keep flying it, don't let entanol fuel get old.  Have scoped the cylinders and they look "bristol"        Cheers,,,,,,,,  Lynn  

• ▶ Reply