flyrotary@lancaironline.net Mailing List Archive

Bill,

It may be that you have an intermittent problem with the power supply to the secondary fuel injectors. Dennis had a similar problem that may have been traced to a switch. The system would operate normally at MAP less than the staging point but have problems when all four injectors were required.

Steve Boese

On Jan 15, 2016, at 9:29 AM, Bill Bradburry <flyrotary@lancaironline.net> wrote:

I am a little confused as to what may be going on with my EC-2.

I recently had an incident where the engine went very lean just after take off and during the climb out to pattern altitude. I didn’t do any troubleshooting. I just set the mixture control to as rich as possible and continued in the pattern to land.

On the ground, I could find no problems with fuel, either tank, fuel pressure, etc.

I decided to follow Steve’s procedure below. After doing this procedure, the engine ran smoothly from idle to 22 inches on the ground. I put it into mode 9 and let it change a few spots on the MAP. Almost all the MAP table was still set at zero.

I taxied out to fly and during the takeoff run, at about 29 inches and 7100 rpm, the engine went very rich, 10:1. I adjusted the mixture knob during the takeoff run to about 9-9:30 o’clock. At about 200 feet of altitude, the mixture suddenly went to about 17:1. I moved the mixture knob to about 3 o’clock, but it really didn’t help much. When I got to pattern altitude and pulled the power back, the mixture seemed to stabilize at around 13 or so. I made the landing and back to the hangar with no incident.

On the ground again I checked the MAP and the table was at zero at all the places the engine had been operating during the climb out.

Any ideas?

Bill

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
Sent: Thursday, January 07, 2016 1:10 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Tuning

Steve,

The following assumes that there are no problems with CAS or ignition:

After setting the controller back to all default program values and depending on the update version of your controller, the following excerpt from archive message #54156 of Mar 6, 2011 may be of interest:

"

The tuning procedure then becomes the same whether the primary and secondary injector flow rates are different or identical:

a. Set the staging threshold at a MAP corresponding to the high end of the primary injector flow limit using mode 7. (For 40 lb injectors, about 20" MAP works well.)

b. Adjust Mode 3 to get a mid scale O2 sensor reading at a MAP just below the staging threshold MAP.

c. Adjust mode 6 to get a mid scale O2 sensor reading at a MAP just above the staging threshold MAP.

d. Adjust mode 2 for best operation at minimum idle MAP.

e. Adjust the mixture table throughout the useable MAP range using mode 1 or 9 to keep the O2 sensor reading mid scale. (To be honest, I skip step "e" and simply use the manual mixture control to adjust the mixture in cruise.)
"

Steve Boese
RV6A 1986 13B NA RD1A EC2