----- Original Message -----

From: Ed Anderson

Sent: Saturday, February 28, 2004 7:30 AM

To: Rotary motors in aircraft

Subject: [FlyRotary] Injectors on? Was 13B - No start problem

 

David , something does not sound quite right here.

    My understanding is that your injectors should not normally be open if
they are wired the way Tracy recommends for his Ec2.  While it is true that
there is (or may be) 12V to the injectors - that alone should not normally
cause them to open.  The injectors should only open when the EC2 unit
injector driver (during normal operation) provides a ground path on one side
of the injector wiring for current to flow through the injector. Unless the
EC2 is on and the engine running the injector driver is NOT periodically
grounding the injector and there should be no fuel injected.   In
otherwords, with the EC2 off,  you can measure 12V on both sides on an
injector. Therefore no voltage drop across the injector signifying no
current flow.   However, when the EC2 is operating it grounds one side of
the injector causing current to flow thru it lifting the injector selnoid
and allowing  fuel to squirt into the engine.  That that point you would
find 12V on one side of the injector and ground (zero volts) on the other
side - would probably need an oscilloscope to see it due to the speed at
which it happens when the engine is  running.

Now, there is apparently a transit response in the system so that when you
first apply power the injectors are triggered once.  With my EC2 off but
pressure in the lines, if I turn my injector switches ON I can see the fuel
pressure drop (pump off) due to this transit opening.  However, once that
transit and it's almost immediate on and off action occurs the injectors are
then closed until triggered by the EC2.  So you can end up with fuel in the
engine due to this transit phenomona, but they should NOT normally be
continously open..

Tracy??

Ed
Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
----- Original Message -----
From: "David Leonard" <Daveleonard@cox.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Saturday, February 28, 2004 1:00 AM
Subject: [FlyRotary] Re: 13B - No start problem


>
>
> I put gas in my tanks and ran fuel throught the system for the first
> time today and discovered something that surprised me and may be causing
> problems.  With the injectors connected to the main buss, when ever
> there is power to the injectors they are OPEN!!!  This occurs even when
> the EC2 does not have power.  As I was trying to adjust my fuel pressure
> and check for leaks (there were only 4 ;-) I had about 10 min of pump
> running time with the injectors open before I discovered the issue.  Now
> I'm sure I have quite a puddle of fluid inside the intake and rotor
> chambers.
>
> If you are spending any amount of time running the pump without running
> the engine, and there is power to the injectors, you may be flooding
> everything.
>
> Its not really a problem now that I know how it works, but I was just
> expecting the injectors to be closed unless the e-shaft was turning.
>
> And speaking of gas in the tanks  I went to add oil and realized that I
> never made a final decision with regard to ratio...  I finally chose
> 70:1 but know that some are going with 100:1.  Anyone have a more
> definitive word?
>
> David Leonard (hoping for first start attempt this weekend)
> The Rotary Roster:
> http://members.aol.com/_ht_a/rotaryroster/index.html
>
> > -----Original Message-----
> > From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
> On
> > Behalf Of Steve Brooks
> > Sent: Friday, February 27, 2004 2:23 PM
> > To: Rotary motors in aircraft
> > Subject: [FlyRotary] Re: 13B - No start problem
> >
> > John,
> >
> > Have you checked to see if you still have spark ?  Also you might want
> to
> > recheck the static timing to make sure that you're in the ball park.
> > If it's flooded, turn off the fuel pump open the throttle a little bit
> and
> > crank it.  It should fire up and burn off the excess fuel.
> >
> > Steve
> >
> >  -----Original Message-----
> > From: Rotary motors in aircraft
> [mailto:flyrotary@lancaironline.net]
> > On
> > Behalf Of John Slade
> > Sent: Friday, February 27, 2004 2:53 PM
> > To: Rotary motors in aircraft
> > Subject: [FlyRotary] 13B - No start problem
> >
> > A little help on starting???
> >
> > After my first Brrrapppp I dont seem to be able to get anything at
> all.
> > The plugs all fire nicely when out, and I have plenty of fuel
> pressure.
> > After cranking the plugs are wet.
> >
> > Starting fluid?
> > Any other ideas?
> >
> >
> > >>  Homepage:  http://www.flyrotary.com/
> > >>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
> >
> >
> > >>  Homepage:  http://www.flyrotary.com/
> > >>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
>
>
> >>  Homepage:  http://www.flyrotary.com/
> >>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
>



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