I went thru and
cleaned up all my grounds and it seems to have fixed everything with the
exception of the hiccup.
Tracy, have you finished
the bench testing on the EC-2 upgrade yet? I would really like to try
and see if that will fix this problem. My wife really doesn’t like
that hiccup!
Bill
B
From:
Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
On Behalf Of Bill
Bradburry
Sent: Saturday,
December 08, 2012 3:41 PM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: Aeroquip
hose
I currently have a
separate ground from each of the batteries to a Nuckolls “forest of tabs”
ground point. Everything inside the cockpit grounds here. Also
the fuel pumps and injectors ground here. The coils ground on the
center iron. There are separate grounds from each battery to the PSRU
plate on each side of the starter. I have considered bringing two
separate grounds from the center iron to the batteries just in case there is
resistance getting from the center iron to the PSRU
plate.
I am also taking
all my grounds apart to check for corrosion or anything that seems that it
might not be properly bonded.
I am doing this for
two reasons. One, I am still getting that occasional “hiccup” that is
violent enough to shake the plane when it happens. It is bad enough
that I am concerned that it might be bad for the pin in the PSRU. I am
also wondering if it could be the PSRU that has sheared the pin and is
slipping? Someone on here had that happen and I would really
appreciate a description of what that sounded and felt like and also how I
could make certain that is not the problem. No, I don’t want to
dismantle the PSRU to check it unless that seems to be the only way to check
it.
Also, Tracy, how are you
progressing on getting the upgrade for the EC-2 that might fix this hiccup
if that is what it is? I think you had it done for the EC-3 and were
working on the EC-2 implementation??
The second reason
for going thru the grounds is that I am having an intermittent problem with
my GTX327 transponder, MFD150 moving map, and TruTrak autopilot shutting
down. This seems to happen more often when I key the mike on my
GNS430W radio, but keying the mike is not required. It sometimes
happens just out of the blue. Also most of the time, only the
transponder shuts off. Only sometimes does the moving map and
autopilot join in the fun.
Everybody tells me
that it sounds like a ground issue, hence I am going thru the ground system.
I welcome all
opinions and input!
Bill
B
From:
Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
On Behalf Of Tracy
Sent: Saturday, December 08, 2012 10:56
AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Aeroquip
hose
Tying the engine parts
together should not be necessary but you still need a separate ground from
battery to airframe ground (if metal) and your avionics ground
point. Also separate feeds from +12 battery to
starter/alternator and avionics. You can Use the starter/alternator
feed for coils, injectors & fuel pumps to keep noise down on the
avionics bus.
Tracy
On Sat, Dec 8, 2012 at 12:23 AM, Bill Bradburry <bbradburry@bellsouth.net>
wrote:
Several months ago,
after a discussion with Tracy, I ran grounding straps from each
battery to the PSRU plate on both sides of the starter mount. I had
previously had the grounding strap running between the center iron and the
“forest of tabs” grounding block on the firewall. Tracy suggested I move
it so the starter amps would not get into the grounding
block.
Now I have the
igniters grounded on the center iron and I am considering running a ground
strap from the center iron to the batteries or trying to tie each section of
the engine “sandwich” together by running a wire between them. This
would to be certain that the ground is good on the
igniters.
Any opinions on
this??
Bill
B
From:
Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On Behalf Of Andrew Martin
Sent: Friday, December 07, 2012 8:29
PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Aeroquip
hose
Bill
As Mark
says + make sure you have a ground cable/strap connected battery direct to
your starter. Do not expect starter to ground through your engine without
problems.
I remember Tracy posting on this issue years ago just
a bit hard to find in the archives
now.
Andrew
On Sat, Dec 8, 2012 at
7:26 AM, Mark Steitle <msteitle@gmail.com>
wrote:
Bill,
You may want to check
your engine ground. Starter current may be causing
this.
On Fri, Dec 7, 2012 at
5:12 PM, Bill Bradburry <bbradburry@bellsouth.net>
wrote:
I am working on
cleaning up my ground system and I noticed that I have
several, 3 or 4,
places on my SS braided fuel hose that appears to be burnt
like it had an
electrical spark exit from it. I have not found anything in
the
vicinity of these places that look like where the spark? would
have
jumped??
Has anyone seen something like this and what should
I do about it? Do I
have a ground problem in the engine compartment
or is this maybe static?
The hoses are covered by SS and are connected on
one end to a filter that
has a ground strap on it and on the other end to
the fuel rail which is
grounded to the engine.
Bill
B
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