Hi Mike,
Tracy gets busy as you can imagine, I’ll try to answer your
question about the “snubber” fix.
Basically, it was discovered by a member
of this list that the collapsing magnetic field of the injector coils were
having a more significant effect on injector open time than first
realized. In short, the injector on time was not just that commanded by
the EC2/3 but was also affected by this generated voltage of the collapsing
field. Since it was not a fixed thing (depending on several factors), it
could make tuning a bit more of a hassle to tune – no danger of your
engine quitting or anything drastic like that because you could compensate (to
some extent) by your tuning and manual mixture control. But, because the
effect varied – tuning was not necessarily as easy and precise as
could be desired.
In any case, a fix to such excursions in
other fields are known as “snubber” fixes – I presume because
they “Snub” out the problem. Tracy will generally
automatically add the “snubber’’ fix the next time you have
reason to send your EC2/3 in for an upgrade.
I flew for years without the fix, so it is
not something you have to do immediately, but should at some point. You
will likely need to retune your fuel map afterwards, so I would not spend
a LOT of time doing that at this point unless you do have the “Snubber”
fix.
My 0.02 worth
Ed
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Mike Fontenot
Sent: Thursday, May 07, 2009 10:16
AM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: Initial
Engine Startup
Tracy,
You wrote:
>>What was the date of last update or service? Might be able to
tell about the snubber update from that.<<
Here is the update info for my EC2 / EM2 combo, which was in October 2007:
Looking at my manuals I see:
EC2 Manual: Model: EC2 . AD Serial# 634 Date:
19-Oct-07 . On the first page of the manual, at the top it says:
RWS EC2-AD Suzuki-4 ENGINE CONTROLLER 10-17-07
Page 10 has the section: MODE 2 INJECTION DYNAMIC RANGE ADJUST
EM2 Manual: Model: EM2 . C3 Serial# 197 Date: 19-Oct-07
Am I Snubberfied? Has Snubberfication occurred. Is my system Snubberlicious?
I need coffee.
--
Mike
================================
Mike Fontenot
Apex Consulting & Services LLC
Lakewood, Colorado
303 / 731-6645
mikef AT apexconsultingservices DOT com
================================