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On Oct 14, 2005, at 12:38 PM, Ed Anderson wrote:
Well,Buly, I don't have an EM2.
However, I found out early-on that the EC2 had a "sneak-circuit" that permitted power from the injector harness to leak power the CPUs. In other words, I expected that when I turned the power to the Ec2 CPU (I forget the pins at the moment) OFF I expected the unit to be off. So much to my surprise, on my first run with the EC2 I killed the power ( I thought) by turning off the EC2 CPU power switch, but, the engine just kept right on running. So I have to turn off my injectors to kill the engine.
Ed, I have the wiring schematic in front of me, and there is no power switch for the EC2. Mine is wired directly to a CB . So the master bat. switch (I have two separate) powers the EC2. I have to kill both masters to shut everything on the plane.
Tracy explained that he thought most folks would kill the engine (and all power) by turning off the Master switch - which works just fine. Except, I don't want a knee bumping the master switch to kill my engine at an inopportune time {:>), so I had a separate toggle (away from the knee) to turn on power to the EC2 (which of course did not work as I intended).
For me, I have to turn off both masters, both pumps or both injectors for engine to stop. I had both injectors wired (as per schematic) to one CB.
But than started thinking that if the CB trips, will shut all injectors. So I split them to two CB. I wander if this may have something to do with the problem?
Buly
So, I don't know - but I suspect there may be a similar thing ("sneak circuit') happening with the EM2 in that the EC2 is providing some voltage with the primaries on. However, only Tracy can answer for certain.
Ed
----- Original Message ----- From: "Bulent Aliev" <atlasyts@bellsouth.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Friday, October 14, 2005 12:07 PM
Subject: [FlyRotary] Re: injector size
Hi Ed,
I discovered last night that there is a mystery related to my primary
injector switch: with only the master on, I turn the primary injector
switch on, and the EM display comes on with 6.5V "low voltage"
reading. I have to find out how the injector cirquit can feed power
to the EM?
Any ideas?
Buly
On Oct 11, 2005, at 4:47 PM, Ed Anderson wrote:
Buly, Something you might try is setting the staging manifold
pressure point at a higher manifold pressure. That way your 550c
primary should be the only ones on at low and even medium rpms and
since the Ec2 appears to work fine with 550s out of the box, this
might help. Since you have already gone the mode 3 route, this is
the only thing I can think of.
I believe the problem is that upon initial start, the EC2 sees
ambient pressure in the manifold (30"Hg) and thinks the engine is
wide open throttle, it checks the fuel map for the amount of fuel
to inject for MAP = 30"Hg and injects fuel (a lot!) accordingly.
Normally, this is not a problem as the engine immediately starts
and sucks the manifold pressure down to the nominal 12-14" Hg (for
idle) and the fuel injected is adjust accordingly AND the secondary
are turned off (until the manifold pressure again rises to the
staging point), but with your big injectors having all four dump
fuel before the engine is started and running is probably
contributing to the problem.
Do you have switches on your injectors and have you tried starting
with the secondary injectors turned off??
I presume you don't have the cold start turned on (accidentally or
otherwise -shorted).
I presume you have programmed a lean mixture for start up region .
Ed A
----- Original Message ----- From: "Bulent Aliev"
<atlasyts@bellsouth.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Tuesday, October 11, 2005 4:15 PM
Subject: [FlyRotary] injector size
Hi Guys,
For the last few months I have been struggling with engine
flooding on start up. Looking at the EC2 manual, it tells me
that it comes pre-set for "standard" Mazda injectors. I checked
the injector charts and most of the Mazdas have 460 or 550 CC
injectors for primary and secondary. My engine (Cosmo 13B) comes
with 550 cc primary and 850 cc secondary.
I did some Mode3 adjustment on the EC-2 and looks like it's a bit
better, but the trailing plugs get wet if it does not start right
away?
Any Ideas?
Buly
--
Homepage: http://www.flyrotary.com/
Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/
--
Homepage: http://www.flyrotary.com/
Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/
Bulent Aliev
www.enginegearonline.com
Email: bulent@enginegearonline.com
Ph. 954 557-1019
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
--
Homepage: http://www.flyrotary.com/
Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/
--
Homepage: http://www.flyrotary.com/
Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/
Bulent Aliev
www.enginegearonline.com
Email: bulent@enginegearonline.com
Ph. 954 557-1019
Buly2005sm.jpg
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