As for your EM-2 air/fuel display, does your engine run well at the mid-scale reading?  My engine used to run at mid-scale on the old mixture monitor gauge, but I have to be at about 8 bars on the EM-2.  Tracy says his runs fine at mid-scale on the EM-2, and of course I believe him, but I've never been able to explain this.  

Sort of. It will run well there if I can keep the mixture right there, but it seems unstable and wants to fluctuate alot when below ~75% scale, so thats where I usually tune for (no idea how many bars that is), however it much the same or slightly higher with the mixture monitor, ~75% to 85% scale.

  

 

There's a possibility that my old mixture monitor gauge was just wrong, but I find it odd that mid-scale is right where the engine wanted to be.  Since you have one of these, and have the ability to fashion a variable voltage source, would you test yours to see if the mid-scale reading is similar to the .86V I found with mine?   Since that gauge has colored markings, perhaps the manufacturer centered the green range on .86V for a reason.  I've thought about scaling my EM-2 down to make midrange "normal".   It's just one of those things that festers in the back of my brain and bothers me. 

I can do this but it'll have to wait untill next week when I'm back to work, as I'm on vacation this week. I'm dealing on a piece of land where we will build a log home and hopefully my own airstrip. I'm also dealing on a 25 ton excavator I'd like to buy to shape the land (re: airstrip), so if successful on both counts I may have very little spare time for the list or flying for the next 2 years.

 

Cheers,

Todd (feeling much pain from hockey injuries... need beer!)