Mike, its got to be frustrating to have it
run well for a couple of months and just when you have convinced yourself
the problem is gone, it comes back.
I presume there is nothing (no action,
sequence of actions) that you can think of having taken recently - any
different than you have done during the months the engine ran well that you can
think of. Nothing different perhaps in getting ready for another flight?
Since the fuel map is stored in non-volute
memory, it’s hard to figure out how it is being re-written or
destroyed. Normally (as you know) access to EEPROM on a chip is a rather
non-trivial process. Since the A and B controller are two different
chips, I suppose there could be a problem with the B chip – but, while
that does happen, it’s pretty rare. Have not had one myself (yet).
You are able to copy over the A MAP to the
B MAP and it apparently does the copy, but then something causes it to be
re-written with garbage. You do not have Auto tune and I presume you do
not attempt to change the B MAP – but it changes on its own. It
sounds as it the changes to B happen whether you have selected B controller or
not – is that correct. Or does it only happen when you are using
the B controller or can you tell.
Ed
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Mike Wills
Sent: Wednesday, July 01, 2009
12:10 AM
To: Rotary
motors in aircraft
Subject: [FlyRotary] frustrating
couple of days
I havent flown my RV since a couple of cases of lost data in
the EC2 back in february. Spent the last few months making a bunch of mods,
some suggested by Tracy,
others were things that I thought might increase long term reliability. Also
had to fix leaking fuel tanks in the ensuing period.
Been working up toward renewing flight testing. Engine has
been running really well for the last few months. Thought that the problem was
cured, though not clear how. Then on saturday found that once again my B
controller had lost all data. Engine wouldnt run at any throttle setting on B.
Restored the B controller by copying A > B.
Last night after work ground ran the engine for about 30
minutes at various throttle settings and it ran as good as always. Also ran
fine on the B controller.
Tonight after work I fired it up. Ran fine initially. After
about 15 minutes noted some minor surging at a couple of throttle settings
below 2000 RPM. Also noticed that in this RPM range where the mixture had
previously been fine, my mixture monitor is off the scale lean. Slowly got
worse, to the point that it wouldnt idle at what was previously a solid
1350RPM. Couldnt get it to run at all below 1500, everything between 1500 and
about 3000 RPM pretty rough. Everything over 3000 is fine. No idea what caused
this change. I put the airplane away and walked away in disgust. I'm back to
where I was a year ago and I'm just about fed up with this thing.
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