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Old 04-13-2021, 01:58 PM
Mike Houston Mike Houston is offline
Join Date: Dec 2020
Location: Bushmills
Posts: 34

Originally Posted by skydiverlv View Post
I have ran 91 zero ethanol 95% of the time in my ULis engine since about 10hr and now have 565hr on it. The factory minimum is 93 octane. Spec for head temp is maximum 390f. My head temps never exceed 260f on the hotest day in a continuous climb never having to tip nose over for head or oil temperature. Spark plug threads are coated with thermal conductive paste. I believe keeping the head and plug temps lower allow the use of 91 octane with no issues.
Interesting, do you have the engine installed in a vans aircraft?
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Old 04-13-2021, 03:16 PM
spacedoc spacedoc is offline
Join Date: Sep 2020
Location: Long Beach, CA
Posts: 6

Remember that Europe and the US use different measurement methods for octane, so take that into account when talking about pump gas ratings and requirements published by motor manufacturers.

EU 95 = US 91
EU 98 = US 93
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Old 04-15-2021, 09:08 AM
Yank Yank is offline
Join Date: Feb 2013
Location: Spotsylvania
Posts: 48

According to the UL power website the fuel requirement for a 520 is : MOGAS with min. 97 octane rating or AVGAS (98 Oct = 90MON = 94 AKI)

In Europe, the octane rating on the pump is simply the RON figure. America, by contrast, uses the average of the RON and the MON figures, called the AKI (anti-knock index). Thus, 97 octane “super unleaded” in Britain is roughly equivalent to 91 octane premium in the United States.
Dogwood Airpark, VA
RV-14 Tail kit in progress
Wing kit ordered

Last edited by Yank : 04-15-2021 at 09:16 AM.
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