Bill,

 

I tested moving the rpm / map threshold (mode 7A) from 2500 to 3000,4000,2000 and 1200. I was still seeing a problem in this address range. Not sure it was the same exact problem but same symptoms. Tune it richer one time and then next time it need to be leaned. With the MAP at 12.5 and RPM at 2270 I would expect to using address 26 or 27 not 37. Address range 32-63 are for above 13" MAP and rpm between 2500 and 3800. 12.5" and 2270 rpm does not meet that condition. But it is above 10" MAP. Is that a third condition?

 

I had the same experience as you reported with mixture address gaps when tuning. I skip from about 42 to 72 when slowly advancing the throttle one address at a time. Advance the throttle quickly and the engine would miss and cough. I set the skipped address range back to near 0 and can advance the throttle quickly with little hesitation. I think it will need to be fine tuned in flight.

 

 

Bobby

---

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Bill Schertz
Sent: Tuesday, April 21, 2009 8:40 PM

To: Rotary motors in aircraft

Subject: [FlyRotary] Re: EC2 address range issue

Bobby,

On my EC-2, the map table changes from low table to high table at 2400 rpm. I don't have a super charger, and my EC-2 may not be the same model as yours, as Tracy keeps making changes/improvements.

 

You are seeing one reading at 3010 rpm and another at 2270, these span the area where mine (according to manual) switches between low and high map tables.

Bill Schertz
KIS Cruiser #4045
N343BS

----- Original Message -----

From: Bobby J. Hughes

To: Rotary motors in aircraft

Sent: Tuesday, April 21, 2009 8:20 PM

Subject: [FlyRotary] EC2 address range issue

I sent an email to Tracy but he's at SNF this week and not sure he will see it until next week. Though I would run this by the group.

 

Mixture Correction Table address 32-41 are giving me problems. Here is an example of what I am seeing.

 

Address 37 , MAP 12.1, RPM 3010, Val +26, O2- 14.5  Tuned perfect. Move the throttle up and down the map table and engine starts to run poor in the address range. Adjust throttle back to Address 37 and things have changed.

Address 37,  MAP 12.5, RPM 2270, VAL +26, O2- 12.5  Tuned rich.

 

I have tuned this range a dozen or more times. It also happens to be right in my taxi range.

 

Ground run settings.

 

Prop in fixed mode at high rpm setting.

Supercharger 1" bypass open so no air is being compressed in manifold.

Prop and supercharger settings do not seem to make any difference with this problem.

I played around with mode 7A changing the rpm vs manifold reference points but did not seem to make a difference.

 

I can idle at 10" MAP and 1200 rpm.

 

 

 

Any ideas?

 

Bobby Hughes

(last item before flight)