At the recommendation of Tracy, I used a 2K resistor. seemed to do the job.

 

I came to find this out by testing whether the injectors fired in mode 0 when button pushed. One injector wasn’t seeming to fire, no click when pushing the button. Then started switching injector wires around to test if it was the injector or the wiring. Injectors okay, something with wiring.

 

then noticed that with EC-2 on, BMA off, the injector would fire when the suspect wiring was plugged in to the injector.  It was being held open by current drain through the BMA unit.

 

Bill Schertz
KIS Cruiser #4045
N343BS
Phase one testing Completed

 

From: Mark Steitle

Sent: Tuesday, May 29, 2012 8:14 AM

To: Rotary motors in aircraft

Subject: [FlyRotary] Re: Injector balancing

 

Bill, 

 

Since I do have a BMA EFIS-1 (for just a little longer), this is a very real possibility.  I'll check this next weekend.  What value resistor did you install?

 

Thanks,

Mark

On Mon, May 28, 2012 at 10:37 PM, Bill Schertz <wschertz@comcast.net> wrote:

Mark,

Is rotor 1 connected to the tach signal line on the Blue Mountain? When I had that, the Blue Mountain unit drew enough current to hold that injector open. Putting a resistor in line solved the problem.

 

Bill Schertz
KIS Cruiser #4045
N343BS
Phase one testing Completed

 

From: Mark Steitle

Sent: Monday, May 28, 2012 8:38 PM

To: Rotary motors in aircraft

Subject: [FlyRotary] Injector balancing

 

I'm in a bit of a dilemma and thought I would put this out here for the group to ponder.  

 

First, this is a p-ported 3-rotor, running RWS EC-2 and psru.  I'm running 460cc Mazda primary injectors and 60lb Deka IV secondary injectors.  Primary injectors share a common fuel rail and are positioned close to the engine, between throttle plate and rotor face.  Secondary injectors are located ahead of the throttle plates.  As this is a p-port engine, it has three 1-bbl TB's, located very close to the engine.  Engine will idle down to 800 - 900 rpm, but I normally idle it around 1500 - 1600 rpm.

 

The problem is this, the #1 rotor cuts out at low to mid-range RPM, evidenced by obvious reduced power, very low EGT's on rotor #1, change in exhaust tone, a dark residue in the #1 exhaust port and dark spark plugs on #1.  Just today I was able to get it to run normally with balanced EGT's by adjusting Mode 4, but I had to go full CCW with the program knob to achieve this.  (Mode 4 & 5 adjust similar to Mode 1)  Now it runs well mid-range and the dropped #1 rotor is happily firing away.  I still have some tuning to do, but after adjusting Mode 4, I can now move forward with that.  

 

To date I have tried the following:

  1.  Performed a compression check - OK

  2.  Swapped primary injector with #3 - no change

  3.  Swapped coils with #3 - no change

  4.  Replaced spark plugs - no change, except initially it ran better until the plug fouled

  5.  Checked plug wires with ohm meter - checked good

  6.  Sent EC-2 to Tracy for latest s/w and checkout - no abnormalities found, latest s/w installed

  7.  Checked secondary injectors for leakage - none seen

 

Can anyone suggest a reason why the #1 primary injector runs extremely rich when set to the factory default setting?  Is this something to be concerned with?

 

Thanks,

Mark