I bought a plane which had a brand new Rossi RC 80 in it. I converted the Plane to electric, and discovered that the glow engine I removed has a header for a tuned pipe and also inflight mixture control. I have never seen this. I see some info on the RC 60 but none on the 80. Anyone know what fuel this likes (nitro / oil)... was it typically used in pattern appications? (Rossi RC 80)

thx!
Tim