I adjusted the “BOG” away in
much the same way as Mike did. I watched the air/fuel ratio indicator and
noticed that when the bog started the A/F ratio would run down and drop off the
lean end. Ergo, I assumed that was an indication the A/F ratio was a bit on
the lean side. I also noticed on the EFISM which MCT “bin” this occurred
in and started adjusting the bars to a higher (larger) value increasing the
fuel until the Bog stopped. As best I recalled I had to do this for about 3-4
bins around the staging area before the Bob forever went away. Sort of nice
after putting up with it for 4 years.
Ed
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Mike Wills
Sent: Wednesday, October 07, 2009
12:01 AM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: engine
runup video
I cant speak for anyone else, but my engine goes lean
when it stages. I know what location in the MCT the transition occurs by
looking at the MCT using the EFISM in real time. I simply set the first
location where it runs on 4 injectors way richer than the previous location.
The next couple of locations gradually taper back down to a more normal
mixture. At this point I trial and error adjust the rich location back down until
the bog re-appears, then richen back up a little. Its really pretty straight
forward with the EFISM - I assume Tracy's
EM makes it equally easy.
----- Original Message -----
Sent: Tuesday, October
06, 2009 5:24 AM
Subject: [FlyRotary] Re:
engine runup video
Mike,
Judging from the ease with which you tuned out the staging bog, you
have a pretty good handle on how to tune the engine with the EC-2/3.
For the benefit of the ones of us who are still trying to understand
that tricky little gem, could you give us some kind of blow by blow as to how
you went about tuning the bog out? I am wondering what you looked for to
determine where the problem was and what you then did with trial and error? to
tune it out.
Bill B
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
On Behalf Of Mike Wills
Sent: Sunday, October 04, 2009
12:35 PM
To: Rotary
motors in aircraft
Subject: [FlyRotary] engine runup
video
For anyone who hasnt had that first engine run and is
looking for some motivation. A buddy visited the hangar a few weeks ago and
shot some video of an engine runup. He posted it to his website and you can
find it here:
This was shot right after I re-installed my original muffler
after the aborted DNA muffler test. Noticeable in the video is the big staging
bog. I had this tuned out about 15 minutes after he shot the video.
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