Normally you’d want to lean to about 100 – 150 F lean of peak.  I did a lean-of-peak run at 60% power with EGTs of 1500 and a BSFC of 0.49.  Did you ever get it over to lean of pea  k? 

 

I did just briefly, but not understanding the 1800+ readings, I didn't want to mess with the mixture much until I knew more about what I was looking at.   

 

I’m running 9.0 : 1 rotors, so that keeps things a bit cooler. What are yours? 

 

9.7

    

I’d be very nervous at 1800.  Could it be unburned fuel burning out into the pipe?  Timing?  Plugs?  Are you producing lots of power? 

 

I'm certainly moving lots of fuel through the engine, but at this point, I can't say if it's being burned, or if it's really making all that much power.  The prop is such an unknown that I just can't say. 

 

Thanks,

Rusty