As Steve pointed out, "hand grenades" are not an indication of bad mixture. I suspect bad crank sensor detection. This can be caused by noise, warped trigger wheel, etc. If the EC2 is an early version, it might need the Renesis CAS mod since the 3rd gen sensor is similar. Btw, the 13BREW started in 93 so I'm still not sure which engine you have.
Tracy
Sent from my iPad
92 13BREW, normally alspirated, it has 28 lb primaries and 40 lb secondaries- That's what it came with.
Brian Trubee
-----Original Message-----
From: Tracy < rwstracy@gmail.com>
To: Rotary motors in aircraft < flyrotary@lancaironline.net>
Sent: Fri, May 13, 2011 3:48 pm
Subject: [FlyRotary] Re: Engine Tuning
Brian,
What engine are you using? 2nd gen, Renesis, etc.
Tracy
Sent from my iPad
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
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