You certainly have it right about the better understanding part!  :>)

So, since it has no effect, why, in step 1, do you say, “with the engine running below the staging point, select mode 6 and turn the program knob slightly to the left of the 12:00 oclock position and press the program store switch”???

Is this some kind of arming step??

The mixture is really rich before I start this step.  I have the mixture control knob at probably 9:00 oclock on both sides of 15” of map.  Is this going to have an effect on that?  Or is it just in case the mixture changes when you go from below 15 to above 15?

With the 4 yellow injectors, where do you recommend the staging point be set?  I have it set now at 15 mostly so I can do stuff like this without running at high power and causing ground cooling problems.  If I get every thing set and then later change the staging point, will this cause a need for a do over? 

 

I will clear and start over.  When would be a good time to call if need be?

Thanks for the response that helps to clear it up.

By the way, to those carb guys, this is a little confusing, but no way bad enough to justify going with a carburetor!!!

 

Bill B

 

 

 

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From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Tracy Crook
Sent: Saturday, April 24, 2010 11:17 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: getting lost in the tuning process

 

"Next is Secondary Injector Differential adjustment, Mode 6.  First I cleared the large secondary mode.  Then I tried to get the mixture mid range at <14”. Then I tried to get the mixture mid range at <14”.  This required a lot of leaning on the mixture knob.  Same for above 16”.  So I turned the program knob to the right and hit store several times. "

I think you need to get a better understanding of how the various modes work and what the direction of change will be.  If you need the mixture to be Leaner, why would you turn the Program knob RIGHT?   (Right = RICH, Left = LEAN)

Also note that Mode 6 will have NO effect on the mixture if you are below the staging point (which you no doubt were at a MP of 14")  It only affects the mixture above the staging point, ie, when the SECONDARIES are on.

Next, hitting the Store button multiple times will have no effect in Mode 6 unless you CHANGE the position of the program knob before you hit Store.

Tracy

On Sat, Apr 24, 2010 at 10:57 PM, Bill Bradburry <bbradburry@bellsouth.net> wrote:

I was working on tuning today and I seem to be getting lost. 

I have the Renesis and I recently changed my injectors out from the Red/Blue to all 4 yellow.  These are larger than the Red primary, but smaller than the blue secondary.  The total flow is close to the same for both.

First thing I did was check fuel injector flow rate, Mode 3.  Between 22 and 26” of manifold pressure that they maintained good mixture with the mixture knob in the center.  So far, so good.

Next is Secondary Injector Differential adjustment, Mode 6.  First I cleared the large secondary mode.  Then I tried to get the mixture mid range at <14”.  This required a lot of leaning on the mixture knob.  Same for above 16”.  So I turned the program knob to the right and hit store several times.  Soon I could move the manifold pressure back and forth over the staging point and the engine ran smoothly.

 

But then I found that I could only run the engine at high power with the mixture knob all the way lean!???  Did I do something wrong?  How did this happen?

 

I think I am lost.  I don’t really understand what I am trying to accomplish with the mode 6, and when I ever get to mode 2, I am going to really be up the understanding creek.

 

Anyone who would like to enlighten me would be appreciated.

 

My current plan is to clear it out and start over from the beginning again tomorrow.

 

Tracy’s instructions kind of make me think that he is expecting the mixture to go rich.  My problem is that it is rich to begin with and doesn’t seem to really change that much.

 

Thanks for the assistance!

 

Bill B