While this is not necessarily unique to Viking engines

Be sure to NOT use an O2 sensor with the Viking engine.  It does not use one:)

O2 sensors are used for initial engine tuning and for low power feedback on cars operating at 40% power and less.  They are not used on any of the closely tuned Viking engines as delivered.  

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Permalink Reply by charlie rosenzweig on May 30, 2019 at 10:27pm

Jan,

Thanks for sharing that.  I added that to my other thread. 

Charlie 

Permalink Reply by Ron Hansen on January 15, 2021 at 9:58am

Can someone link to technical discussions on WHY an aircraft engine running on mogas should not utilize closed loop feedback from an O2 sensor? All of my experience with low altitude engines (including some that operate WAY above 40% power output most of their life) says that open loop operation burns more fuel and makes less power. Note: I am in no way saying that Viking is wrong to eliminate them. I just want to understand the science behind it.  

Permalink Reply by Russellmn on January 28, 2021 at 8:29pm

My experience has been the same.  Even ultra high hp drag cars run O2 sensors to get the most out of them, not sure why you wouldn't run them???

Permalink Reply by Randy Ferri on January 30, 2021 at 9:10am

I agree, not sure why you wouldn't use it.  I know the Aeromomentum engine uses an O2 sensor.

Permalink Reply by Ron Hansen on January 31, 2021 at 11:58am
I posed this question to Aeromomentum also. He gave a lengthy and very detailed reply about the various operating modes that their ECU utilizes. Basically, it only uses the O2 input to fine tune best efficiency in cruise. During initial warmup and wide-open takeoff, it operates the same as Viking with a stored fuel map and automatic altitude compensation that is tuned just slightly rich. In the event of a failed O2 sensor, it reverts to speed density mode and ignores the sensor. He also said the O2 sensor fails within 100 hours if you run 100LL, so you either keep replacing sensors or feed it only unleaded. The sensors aren't terribly expensive and it's easy to replace. With that explanation, I think I would prefer using the O2 sensor so it can get that slightly better closed loop efficiency.
Permalink Reply by Frank A Pisz on January 31, 2021 at 12:30am

One reason not to use an O2 sensor on a Viking engine (or any other engine in an aircraft application) is that you would be restricted to mogas, which many airports don't carry.  The lead in 100LL Avgas would foul up the O2 sensor rather quickly.

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