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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 06:59:39 -0400
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>

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
>
>
>
>