From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of bktrub@aol.com
Sent: Friday, May 13, 2011 5:35 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Engine Tuning

Since the weather has been cooperating lately, I've had the opportunity to put a few more hours on the airplane. On the ground, I can go from an idle up to full throttle and the engine will be smooth. But when I take off, it seems that as soon as I'm up a few hundred feet off the runway, I get hellacious backfiring at full throttle. I can mitigate it a bit by throttling back to about 5100 rpm, and turning the mixture knob to near full rich. It's getting to be a bit nerve wracking to take off thinking I've got it smoothed out and then get a series of hand grenades going off under my butt. I'm thinking that I'm still running too lean up at map address 106 or so. So, I go into the edit page and richen up the mixture around those addresses. I think I'm creeping up on smooth full throttle running.

The good news is that my coolant runs at 175 degrees and oil at less- so the cooling is more than effective, I just need to close up my air inlet a bit or restrict the outflow.

Brian Trubee