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Date: Sun, 26 Jul 2009 07:55:40 -0600
From: Bob White <bob@bob-white.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Chris fuel problem
Message-Id: <20090726075540.d4233f61.bob@bob-white.com>
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The EC2 opens an injector by switching on a transistor which connects
the injector lead to ground.  12V is supplied to the other side of the
injector.  If there was NO ground, it wouldn't be possible to turn on
the injectors. However, there are two pins on the EC2 that handle the
injector grounds.  If it's wired up per the instructions, those two
wires are grounded to the aircraft ground near the EC2.  With the EC2
ground disconnected the result would certainly be unpredictable.  One
possibility is that the EC2 wasn't working at all, but the injector
transistors were providing enough conduction to hold the injectors
open.  Which is what Bill said. :)  There could also have been a "poor"
ground through other paths that could have resulted in unpredictable
operation.

Bob W.


On Sun, 26 Jul 2009 11:50:36 +0000 (UTC)
wschertz@comcast.net wrote:

>=20
> Chris,=20
> Since the fuel was a puddle, it [obviously-probably] formed during the ti=
me you were=20
> cranking, with the ground disconnected, I have no idea how the current wo=
uld=20
> flow, but I suspect that your injectors were being held open, and dumping=
=20
> fuel into the engine, where no fire because of EC-2 not having ground.=20
>=20
> I had a primary injector that was held open by the BMA tach, and would ge=
t=20
> fuel dumping from that until I corrected that problem.=20
>=20
> Then you reconnected and it ran on B, poor on A, as someone suggested, yo=
ur=20
> MAP may have been corrupted on A -- pure speculation on my part.=20
> Bill Schertz=20
> KIS Cruiser #4045=20
> N343BS=20
> Phase I testing=20
> ----- Original Message -----=20
> From: "Christopher Barber" < CBarber@TexasAttorney.net >=20
> To: "Rotary motors in aircraft" < flyrotary@lancaironline.net >=20
> Sent: Saturday, July 25, 2009 7:02 PM=20
> Subject: [FlyRotary] Just livid.....=20
>=20
>=20
> >I have not worked on my engine or electrics in over a week.=A0 Last time=
 I=20
> >ran the engine it ran so well, I wanted to taxi over and pull a first=20
> >flight.=A0 NOT a good idea without wings or a canard.=20
> >=20
> > Since then, since the airport is about to force us onto the ramp out of=
=20
> > our nice, comfortable hangar in order to repair the roof from damage fr=
om=20
> > Hurricane Ike, I have been refinishing the strakes.=A0 I got them seale=
d up=20
> > a while back, but I blew off the micro and primer finishing since I wan=
ted=20
> > to focus on the engine.=A0 Finished the UV primer yesterday and they lo=
ok=20
> > good and should be good enough to protect from the elements for a bit.=
=20
> >=20
> > So, I go out today and start the engine.=A0 I have NOT TOUCHED anything=
 with=20
> > the engine or electrics in more than a week, it is not starting.=A0 Cra=
p.=20
> > WHAT!!!!! The dreaded NOS!!! CRAP X 10.=A0 Whats up with that?=A0 Got o=
ut,=20
> > looked under the engine and there was a big puddle of FUEL.=A0 Checked =
all=20
> > lines.=A0 Turned on pumps, checked lines etc and could find nothing.=20
> >=20
> > I looked at the wires to the ECU and all was secure, EXCEPT, I notice m=
y=20
> > main (16gage) ground wire broke at the connector at the ECU.=A0 Repaire=
d the=20
> > wire.=20
> >


--=20
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