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From: Bulent Aliev <atlasyts@bellsouth.net>
Subject: Re: [FlyRotary] Re: Renesis full power fuel burn / EC2 injector driver change
Date: Sun, 8 Apr 2007 08:09:06 -0400
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>

I don't remember exactly Mark, but I know it is much lower than 36.  
WIsh I had a data logger :)
Buly

On Apr 8, 2007, at 7:58 AM, Mark Steitle wrote:

> Buly,
> Out of curiousity, what FP do you see at idle?
>
> Mark S.
>
>
> On 4/8/07, Bulent Aliev <atlasyts@bellsouth.net> wrote: Mark, I set  
> my FP with engine off at around 36 psi.
> Buly
> On Apr 8, 2007, at 1:17 AM, Mark Steitle wrote:
>
> > David,
> > If you don't mind me asking, how did you go about adjusting your
> > fuel pressure regulator?  I ask because I had mine set too high,
> > but thought it was correct.  I never could get it to run well in
> > the lower rpm range.  When I reduced the pressure I was finally
> > able to get the engine to run better than ever.  It ran great at
> > high speed and would even idle smoothly down to 900 -1000 rpm.
> > With the manifold referenced pressure regulator, the fuel pressure
> > will change depending on MAP.  If I'm correct, you should set it
> > with the engine not running.  If you set it with the engine
> > running, your actual pressures will be way too high, causing tuning
> > issues.
> >
> > Mark S.
> >
> >
> > On 4/7/07, David Leonard <wdleonard@gmail.com> wrote:
> > Tracy,
> >
> > Cool, this is the first I have heard of the injector drive update
> > and I am hopeful that it might be the key to my idle problems.  I
> > have done a lot of fiddling and still cant beat it.  I am
> > particularly interested to hear what kind of idle issues it fixes,
> > to see if it sounds like mine.
> >
> > My problem consists of constantly wandering mixture need... (the O2
> > bar is constantly wandering full scale without change in throttle,
> > load, or mixture setting).   I have frequent misses, and I have to
> > run my fuel pressure as low as my regulator can be set (about 32
> > psi at idle) or the problem gets worse.
> >
> > The weirdest thing occurs at shutdown.  I shutdown by turning off
> > the fuel pump.  When I do that, the engine runs silky-smoothly for
> > a second or two before stopping.
> >
> > That made me concerned there might be some sort of electrical
> > interference between the fuel pump and the EC2 since they were on
> > the same buss.  I moved the pump to a separate buss, tried a
> > different pump, tried another buss, and installed a capacitor but
> > none of that seemed to have any effect.
> >
> > Do you think it would be worth sending my EC2 in for the new  
> upgrade?
> >
> > --
> >
> > David Leonard
> >
> > Turbo Rotary RV-6 N4VY
> > N4VY.RotaryRoster.net
> > www.RotaryRoster.net
> > leonardiniraq.blogspot.com
> >
> >
> > On 4/6/07, Tracy Crook <lors01@msn.com> wrote:
> >
> > EC2 injector drive snubber update.
> >
> > On the subject of the injector driver snubber change,  I had hoped
> > to make it an easy to do in the field thing but it did not turn out
> > that way.  The physical change is fairly simple (adds a single part
> > to the board) but the change in injector drive pulse width
> > requirement was so radical that it is beyond the current range of
> > the injector flow rate adjustment (Mode 3).   This requires an
> > update to the EC2 software so it has to be done here : (
> >
> > The same thing applies to the EM2 since it determines the fuel flow
> > by looking at the injector pulse on time.   It could not be
> > recalibrated to compensate for the change so it's software had to
> > be updated as well.
> >
> > OTOH, if you are currently flying the EC2 and/or EM2 and you are
> > happy with the way it is running, there is no pressing need to
> > change anything.  This is not a safety of flight issue.
> >
> >  This change is only necessary if you are finding it impossible to
> > get the engine to run smoothly at idle.  Note that this is not the
> > only thing that can cause rough idle so only do this as a last
> > resort to fix idle problems.
> >
> > Since I only today got the EM2 software changes installed, I still
> > do not know if there is any fuel burn improvements as a result of
> > the snubber change.  All EC2s shipped since March 20 have this
> > change incorporated.
> >
> > Tracy
> >
> >
> >
> >
>
>
> --
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